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Ethereum Gas Price Reporting Index

EVM Gas Reporting Index: Catalogue of Transaction Pricing Services and their implementation differences

This originally started as a simple collection of All Gas Price Prediction and Reporting Services and their various formats (i.e. an index of all the different gas pricing api's).

Report Version Releases: <br />

SoK: EVM Gas Pricing Methods, Mechanics and Transaction Pricing Services

27 Apr. 2024, doi:10.5281/zenodo.11077372.

Citation

see CITATION.cff

Bacha, S. (2024) “SoK EVM Gas Pricing Methods, Mechanics and Transaction Pricing Services”. Zenodo. doi: 10.5281/zenodo.11077372.

[v2.0.0] Bacha, Sam. (2024). SoK EVM Gas Pricing APIs: Transaction Pricing Services and their implementation differences (Version 2.0.0) [Computer software]. https://doi.org/10.5281/zenodo.1234
[v1.1.12] S. Bacha, (2021, 2022). EVM Gas Reporting Index: Catalog of Transaction Pricing Services and their implementation differences (Version 1.1.12) [Computer software]. https://doi.org/10.5281/zenodo.1234

• Gas Price Reporting Index
  • EVM Gas Reporting Index: Catalogue of Transaction Pricing Services and their implementation differences
  • EIP-2930: Optional Access List transactions
    • Accessed addresses
    • eth_createAccessList
      • Conclusion
  • Gas Fee Speed Definitions
  • Gas Reporting Table Format
  • Gas Snapshot Format
    • JSON-Schema definition
    • gas-snapshot
      • Example output
  • eth_maxPriorityFeePerGas
    • Definition
    • Calculating the current maximum priority fee per gas
    • Go-Ethereum Calculation
  • eth_feeHistory
    • Definition
  • Gas Pricing API Providers and Oracles
    • Blocknative
      • gas.blocknative.com
      • bnc-ext
      • BlockNative Chrome Extenstion
      • sample response
    • Curve-Finance
      • getGas
    • WalletConnect
      • specification
      • sample response
    • Flashbots
      • specification
      • request sample
      • response
    • EtherScan
    • GasNow [no longer in service]
      • GasNow Legacy
    • Gnosis
    • MetaMask
      • Consensys CoDeFi
    • 1inch
    • v1.0
    • v1.2
    • ethGasStation
    • etherchain.org
    • etherchain-gasnow
    • poanetwork
    • Zoltu
    • MyCrypto
    • EtherScan
    • Zapper
    • archerdao
    • gas-ticker
  • Appendix
    • Custom Network Over pricing
    • URL Index
    • EVM Params

EIP-2930: Optional Access List transactions

source, @fvictorio/gas-costs-after-berlin#EIP-2930-Optional-Access-List-transactions

This EIP adds a new type of transaction that can include an access list in the transaction payload. This means that you can declare beforehand which addresses and slots should be considered as accessed before the transaction’s execution starts. For example, an SLOAD of a non-accessed slot costs 2100, but if that slot was included in the transaction’s access list, then that same opcode will cost 100.

But if the gas costs are lower when an address or storage key is already accessed, does this mean that we can add everything to the transaction’s access list and get a gas reduction? Yay, free gas! Well, not exactly, because you also need to pay gas for each address and each storage key that you add.

Let’s see an example. Say we are sending a transaction to contract A. An access list could look like this:

accessList: [{
  address: "<address of A>",
  storageKeys: [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ]
}]

If we send a transaction with this access list, and the first opcode that uses the 0x0 slot is a SLOAD, it will cost 100 instead of 2100. That’s a gas reduction of 2000. But each storage key included in the transaction’s access list has a cost of 1900. So we only save 100 of gas. (If the first opcode to access that slot is an SSTORE instead, we would save 2100 of gas, which means that we’d save 200 of gas in total if we consider the cost of the storage key.)

You always pay gas for the address in the access list ("<address of A>" in the example).

Accessed addresses

So far, we’ve been talking only about the SLOAD and SSTORE opcodes, but those aren’t the only ones that change after Berlin. For example, the CALL opcode had a fixed cost of 700. But after EIP-2929 its cost is 2600 if the address is not in the access list and 100 if it is. And, like the accessed storage keys, it doesn’t matter what OPCODE accessed that address before (for example, if an EXTCODESIZE was called first, then that opcode will cost 2600, and any subsequent EXTCODESIZE, CALL, STATICCALL that uses the same address will cost 100).

How is this affected by transactions with access lists? For example, if we send a transaction to contract A, and that contract calls another contract B, then we can include an access list like this:

accessList: [{ address: "<address of B>", storageKeys: [] }]

We’ll have to pay a cost of 2400 to include this access list in the transaction, but then the first opcode that uses the address of B will cost 100 instead of 2600. So we saved 100 of gas by doing this. And if B uses its storage somehow and we know which keys it will use, then we can also include them in the access list and save 100/200 of gas for each one (depending on whether the first opcode is an SLOAD or an SSTORE).

But why are we talking about another contract? What happens with the contract that we are calling? Why don’t we do this?

accessList: [
  {address: "<address of A>", storageKeys: []},
  {address: "<address of B>", storageKeys: []},
]

We could do it, but it wouldn’t be worth it because EIP-2929 specifies that the address of the contract that is being called (that is, tx.to) is always included in the accessed_addresses list. So we are paying 2400 more for nothing.

Let’s analyze our example of the previous section again:

accessList: [{
  address: "<address of A>",
  storageKeys: [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ]
}]

This will actually be wasteful unless we include several storage keys more. If we assume that a storage key is always used first by an SLOAD, then we need at least 24 storage keys just to break even.

As you can imagine, analyzing this and creating an access list by hand is not fun. Luckily, there is a better way.

eth_createAccessList

Geth (starting from version 1.10.2) includes a new eth_createAccessList RPC method that you can use to generate access lists. It is used like eth_estimateGas, but instead of a gas estimation, it returns something like this:

{
  "accessList": [
    {
      "address": "0xb0ee076d7779a6ce152283f009f4c32b5f88756c",
      "storageKeys": [
        "0x0000000000000000000000000000000000000000000000000000000000000000",
        "0x0000000000000000000000000000000000000000000000000000000000000001"
      ]
    }
  ],
  "gasUsed": "0x8496"
}

That is, it gives you the list of addresses and storage keys that will be used by that transaction, plus the gas consumed if the access list is included. (And, like eth_estimateGas, this is an estimation; the list could change when the transaction is actually mined.) But, again, this doesn’t mean that this gas will be lower than the gas used if you just send the same transaction without an access list!

Conclusion

Does this mean that we always save gas when using transaction’s with access lists? No.

Gas Fee Speed Definitions

• Fastest: next block (i.e. <30 seconds) <br>
• Fast: below 2 minutes (<10 blocks) <br>
• Medium: around 5 minutes (<20 blocks) <br>
• Slow: below 30 minutes (a.k.a safe-low, <120 blocks) <br>

Gas Reporting Table Format

Gas Reporting from forge test --gas-report

forge snapshot

Gas Snapshot Format

.gas-snapshot

FooTest:testSetFoo() (gas: 64071)
BarTest:testFuzzCurrentBar(uint256) (runs: 256, μ: 408, ~: 423)

runs: {runs}, μ: {mean_gas}, ~: {median_gas})

JSON-Schema definition

Each test object represents a test function and has the following properties:

The oneOf constraint ensures that a test object must have either the gas property (for non-fuzz tests) or the runs, avg, and median properties (for fuzz tests).

This JSON Schema describes the structure of the .gas-snapshot file format used by Forge. It allows for both regular tests with a single gas value and fuzz tests with multiple runs and statistical data (average and median gas used).

gas-snapshot

The schema defines an object with a single property tests, which is an array of test objects.

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "tests": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "The name of the test function"
          },
          "gas": {
            "type": "integer",
            "description": "The gas used by the test function"
          },
          "runs": {
            "type": "integer",
            "description": "The number of runs for the test function (only applicable for fuzz tests)"
          },
          "avg": {
            "type": "integer",
            "description": "The average gas used across all runs (only applicable for fuzz tests)"
          },
          "median": {
            "type": "integer",
            "description": "The median gas used across all runs (only applicable for fuzz tests)"
          }
        },
        "required": [
          "name"
        ],
        "oneOf": [
          {
            "required": [
              "gas"
            ]
          },
          {
            "required": [
              "runs",
              "avg",
              "median"
            ]
          }
        ]
      }
    }
  },
  "required": [
    "tests"
  ]
}

Example output

╭──────────────────────────┬─────────────────┬───────┬────────┬───────┬─────────╮
│ GasMeterFactory contract ┆                 ┆       ┆        ┆       ┆         │
╞══════════════════════════╪═════════════════╪═══════╪════════╪═══════╪═════════╡
│ Deployment Cost          ┆ Deployment Size ┆       ┆        ┆       ┆         │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ 35287                    ┆ 206             ┆       ┆        ┆       ┆         │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ Function Name            ┆ min             ┆ avg   ┆ median ┆ max   ┆ # calls │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ build                    ┆ 38653           ┆ 38653 ┆ 38653  ┆ 38653 ┆ 15      │
╰──────────────────────────┴─────────────────┴───────┴────────┴───────┴─────────╯

eth_maxPriorityFeePerGas

Definition

https://github.com/ethereum/execution-apis/blob/main/src/eth/fee_market.yaml

The eth_maxPriorityFeePerGas was originally a client specific RPC Method (go-ethereum), it only recently was made part of the official Ethereum JSON-RPC specification. This method was introduced as part of the EIP-1559 (Ethereum Improvement Proposal 1559) transaction pricing mechanism implementation by the go-ethereum team. It is used to retrieve the current maximum priority fee per gas accepted for the network.

You can calculate a default maxPriorityFeePerGas using eth_feeHistory when eth_maxPriorityFeePerGas is not available.

Calculating the current maximum priority fee per gas

The eth_maxPriorityFeePerGas method allows users, wallets, and dApps to query the Ethereum node and obtain the current maximum priority fee per gas.

The priority fee is an additional fee that can be added to a transaction to incentivize miners to prioritize its inclusion in a block. The returned value represents the maximum priority fee per gas in wei, and this value is a dynamic parameter and can change over time depending on network congestion and block builder preferences.

It represents the maximum accepted priority fee at a given moment but does not guarantee that a transaction with that priority fee will be included in the next block. Inclusion depends on various factors such as gas price, gas limit, and transaction competition.

Go-Ethereum Calculation

Client implementations can vary, for example in go-ethereum (geth) it calculates what is the 60th percentile tip over the last 20 blocks by default.

https://github.com/ethereum/go-ethereum/blob/f265cc24b4b17b55b468b315303a3a599fc01d81/eth/ethconfig/config.go#L40-L47

// FullNodeGPO contains default gasprice oracle settings for full node.
var FullNodeGPO = gasprice.Config{
	Blocks:           20,
	Percentile:       60,
	MaxHeaderHistory: 1024,
	MaxBlockHistory:  1024,
	MaxPrice:         gasprice.DefaultMaxPrice,
	Igno

Usage:

To use this method, you need to send a JSON-RPC request to an Ethereum node with the method name eth_maxPriorityFeePerGas.

The request does not require any parameters.

eth_feeHistory

Definition

https://github.com/ethereum/execution-apis/blob/main/src/eth/fee_market.yaml

eth_feeHistory returns transaction base fee per gas and effective priority fee per gas for the requested/supported block range.

The request does require the following parameters:

blockCount: Requested range of blocks. Clients will return less than the requested range if not all blocks are available.
rewardPercentiles: A monotonically increasing list of percentile values. For each block in the requested range, the transactions will be sorted in ascending order by effective tip per gas and the corresponding effective tip for the percentile will be determined, accounting for gas consumed.
gasUsedRatio: An array of block gas used ratios. These are calculated as the ratio of gasUsed and gasLimit.

Gas Pricing API Providers and Oracles

Listed in no particular order.

Notice: GasNow as of 2021-10-01 will be shutting down due to SparkPools closure

Blocknative

@note there are two seperate entries

gas.blocknative.com

Note: This is powered by Blocknative's global mempool data platform

v2 Blocknative

{
    "system": "ethereum",
    "network": "main",
    "unit": "gwei",
    "maxPrice": 50,
    "currentBlockNumber": 15326495,
    "msSinceLastBlock": 40251,
    "blockPrices": [
        {
            "blockNumber": 15326496,
            "estimatedTransactionCount": 322,
            "baseFeePerGas": 11.075381056,
            "estimatedPrices": [
                {
                    "confidence": 99,
                    "price": 13,
                    "maxPriorityFeePerGas": 2.49,
                    "maxFeePerGas": 22.45
                },
                {
                    "confidence": 95,
                    "price": 13,
                    "maxPriorityFeePerGas": 2.13,
                    "maxFeePerGas": 22.09
                },
                {
                    "confidence": 90,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.92,
                    "maxFeePerGas": 21.88
                },
                {
                    "confidence": 80,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.68,
                    "maxFeePerGas": 21.64
                },
                {
                    "confidence": 70,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.58,
                    "maxFeePerGas": 21.54
                }
            ]
        }
    ],
    "estimatedBaseFees": [
        {
            "pending+1": [
                {
                    "confidence": 99,
                    "baseFee": 12.46
                }
            ]
        },
        {
            "pending+2": [
                {
                    "confidence": 99,
                    "baseFee": 14.02
                }
            ]
        },
        {
            "pending+3": [
                {
                    "confidence": 99,
                    "baseFee": 15.77
                }
            ]
        },
        {
            "pending+4": [
                {
                    "confidence": 99,
                    "baseFee": 17.75
                }
            ]
        },
        {
            "pending+5": [
                {
                    "confidence": 99,
                    "baseFee": 19.96
                }
            ]
        }
    ]
}

v1 Blocknative

{
  "system": "ethereum",
  "network": "main",
  "unit": "gwei",
  "maxPrice": 336,
  "currentBlockNumber": 13095949,
  "msSinceLastBlock": 4542,
  "blockPrices": [
    {
      "blockNumber": 13095950,
      "baseFeePerGas": 113.110076547,
      "estimatedTransactionCount": 172,
      "estimatedPrices": [
        {
          "confidence": 99,
          "price": 129,
          "maxPriorityFeePerGas": 15.96,
          "maxFeePerGas": 242.18
        },
        {
          "confidence": 95,
          "price": 119,
          "maxPriorityFeePerGas": 6.84,
          "maxFeePerGas": 233.06
        },
        {
          "confidence": 90,
          "price": 118,
          "maxPriorityFeePerGas": 5.09,
          "maxFeePerGas": 231.31
        },
        {
          "confidence": 80,
          "price": 116,
          "maxPriorityFeePerGas": 3.21,
          "maxFeePerGas": 229.43
        },
        {
          "confidence": 70,
          "price": 115,
          "maxPriorityFeePerGas": 2.28,
          "maxFeePerGas": 228.5
        }
      ]
    }
  ]
}

bnc-ext

BlockNative Chrome Extenstion

blocknative eth gas estimate extenstion

https://blocknative-api.herokuapp.com/data

sample response

{
  "pendingBlockNumberVal": 13378149,
  "seconds": 17,
  "maxPrice": 768,
  "estimatedTransactions": 279,
  "estimatedPrices": [{
    "confidence": 99,
    "price": 86,
    "maxPriorityFeePerGas": 2.96,
    "maxFeePerGas": 170.76
  }, {
    "confidence": 95,
    "price": 85,
    "maxPriorityFeePerGas": 1.75,
    "maxFeePerGas": 169.55
  }, {
    "confidence": 90,
    "price": 85,
    "maxPriorityFeePerGas": 1.56,
    "maxFeePerGas": 169.36
  }, {
    "confidence": 80,
    "price": 85,
    "maxPriorityFeePerGas": 1.48,
    "maxFeePerGas": 169.28
  }, {
    "confidence": 70,
    "price": 85,
    "maxPriorityFeePerGas": 1.37,
    "maxFeePerGas": 169.17
  }],
  "baseFeePerGas": 83.897778652
}

Curve-Finance

getGas

https://api.curve.fi/api/getGas

 https://api.curve.fi/api/getGas

{
    "success": true,
    "data": {
        "gas": {
            "rapid": 36000000000,
            "fast": 35000000000,
            "standard": 35000000000,
            "slow": 35000000000
        },
        "eip1559Gas": {
            "base": 35292604977,
            "prio": [
                1220000000,
                500000000,
                350000000,
                230000000
            ],
            "max": [
                56110000000,
                55390000000,
                55240000000,
                55120000000
            ]
        }
    },
    "generatedTimeMs": 1668181797396
}

WalletConnect

specification

https://github.com/pedrouid/ethereum-api#api

https://ethereum-api.xyz/gas-prices

http GET https://ethereum-api.xyz/gas-prices

sample response

{
  "timestamp": 1633172858972,
  "slow": {
    "time": 756,
    "price": 39
  },
  "average": {
    "time": 84,
    "price": 42
  },
  "fast": {
    "time": 30,
    "price": 54
  },
  "fastest": {
    "time": 24,
    "price": 58
  }
}

Flashbots

eth_gasFee

specification

see source documentation

// prettier-ignore

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    block,                     // Number, current block number
    baseFeePerGas,             // String, a hex number for the baseFee at the current block
    default: {
      maxFeePerGas,            // String, a hex number for the recommended default maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended default maxPriorityFeePerGas
    },
    low: {
      maxFeePerGas,            // String, a hex number for the recommended low maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended low maxPriorityFeePerGas
    },
    med: {
      maxFeePerGas,            // String, a hex number for the recommended med maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended med maxPriorityFeePerGas
    },
    high: {
      maxFeePerGas,            // String, a hex number for the recommended high maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended high maxPriorityFeePerGas
    },
  }
}

request sample

curl -s -L -X POST 'https://protection.flashbots.net/v1/rpc' \
-H 'Content-Type: application/json' \
--data-raw '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_gasFees",
  "params": []
}'

response

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "block": 13467179,
        "baseFeePerGas": "0x0bd0606957",
        "default": {
            "maxFeePerGas": "0x12ec776ebc",
            "maxPriorityFeePerGas": "0x01e47257df"
        },
        "low": {
            "maxFeePerGas": "0x11d7682749",
            "maxPriorityFeePerGas": "0xe45ecec3"
        },
        "med": {
            "maxFeePerGas": "0x12ec776ebc",
            "maxPriorityFeePerGas": "0x01e47257df"
        },
        "high": {
            "maxFeePerGas": "0x1412552c31",
            "maxPriorityFeePerGas": "0x0302bff9d4"
        }
    }
}

EtherScan

https://docs.etherscan.io/api-endpoints/gas-tracker

https://api.etherscan.io/api?module=gastracker&action=gasoracle&apikey=YourApiKeyToken

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "13053741",
    "SafeGasPrice": "20",
    "ProposeGasPrice": "22",
    "FastGasPrice": "24",
    "suggestBaseFee": "19.230609716",
    "gasUsedRatio": "0.370119078777807,0.8954731,0.550911766666667,0.212457033333333,0.552463633333333"
  }
}

GasNow [no longer in service]

gasnow.org/taichi

wss://www.gasnow.org/ws

{
  "type": "gasprice",
  "data": {
    "gasPrices": {
      "rapid": 67000000000,
      "fast": 64455346560,
      "standard": 63455346560,
      "slow": 63455346560
    },
    "cumulativeCounts": [
      {
        "gwei": "63",
        "cumulativeCount": 93
      },
      {
        "gwei": "64",
        "cumulativeCount": 81
      },
      {
        "gwei": "65",
        "cumulativeCount": 65
      },
      {
        "gwei": "66",
        "cumulativeCount": 35
      },
      {
        "gwei": "67",
        "cumulativeCount": 34
      },
      {
        "gwei": "68",
        "cumulativeCount": 32
      },
      {
        "gwei": "69",
        "cumulativeCount": 30
      },
      {
        "gwei": "70",
        "cumulativeCount": 25
      },
      {
        "gwei": "71",
        "cumulativeCount": 22
      },
      {
        "gwei": "73",
        "cumulativeCount": 21
      },
      {
        "gwei": "74",
        "cumulativeCount": 19
      },
      {
        "gwei": "75",
        "cumulativeCount": 17
      },
      {
        "gwei": "78",
        "cumulativeCount": 16
      },
      {
        "gwei": "80",
        "cumulativeCount": 15
      },
      {
        "gwei": "81",
        "cumulativeCount": 13
      },
      {
        "gwei": "87",
        "cumulativeCount": 12
      },
      {
        "gwei": "88",
        "cumulativeCount": 11
      },
      {
        "gwei": "89",
        "cumulativeCount": 9
      },
      {
        "gwei": "94",
        "cumulativeCount": 8
      },
      {
        "gwei": "96",
        "cumulativeCount": 6
      },
      {
        "gwei": "98",
        "cumulativeCount": 5
      },
      {
        "gwei": "109",
        "cumulativeCount": 4
      },
      {
        "gwei": "112",
        "cumulativeCount": 3
      },
      {
        "gwei": "120",
        "cumulativeCount": 2
      },
      {
        "gwei": "221",
        "cumulativeCount": 1
      }
    ],
    "timestamp": 1629975608579
  }
}

GasNow Legacy

{
  "code": 200,
  "data": {
    "rapid": 131000000000,
    "fast": 116000000000,
    "standard": 100000000000,
    "slow": 91600000000,
    "timestamp": 1613914581546
  }
}

Gnosis

endpoint url

{
  "lastUpdate": "2021-02-21T13:38:38.945308Z",
  "lowest": "2",
  "safeLow": "109000000001",
  "standard": "119000000001",
  "fast": "131000000001",
  "fastest": "10680081443136"
}

MetaMask

Consensys CoDeFi

endpoint url

{
  "low": {
    "suggestedMaxPriorityFeePerGas": "1.37826449268",
    "suggestedMaxFeePerGas": "70.067746222",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 30000
  },
  "medium": {
    "suggestedMaxPriorityFeePerGas": "1.5",
    "suggestedMaxFeePerGas": "81.637728684",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 45000
  },
  "high": {
    "suggestedMaxPriorityFeePerGas": "2",
    "suggestedMaxFeePerGas": "93.585975639",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 60000
  },
  "estimatedBaseFee": "57.241234774",
   "networkCongestion": 0.5,
}

{
  "SafeGasPrice": "100",
  "ProposeGasPrice": "108",
  "FastGasPrice": "119"
}

1inch

https://gas-price-api.1inch.exchange/v1.0

v1.0

{
  "fast": 96820000000,
  "instant": 125000000000,
  "standard": 90000000000,
  "slow": 82000000000
}

v1.2

gas-price-api.1inch.io/v.1.2

{
    "baseFee": "93731028208",
    "low": {
        "maxPriorityFeePerGas": "1170000000",
        "maxFeePerGas": "94901028208"
    },
    "medium": {
        "maxPriorityFeePerGas": "2340000000",
        "maxFeePerGas": "96071028208"
    },
    "high": {
        "maxPriorityFeePerGas": "5850000000",
        "maxFeePerGas": "99581028208"
    },
    "instant": {
        "maxPriorityFeePerGas": "5850000000",
        "maxFeePerGas": "129455336670"
    }
}

ethGasStation

endpoint url

{
  "fast": 1200.0,
  "fastest": 1200.0,
  "safeLow": 1020.0,
  "average": 1050.0,
  "block_time": 13.327868852459016,
  "blockNum": 11900622,
  "speed": 0.997822721438169,
  "safeLowWait": 12.9,
  "avgWait": 1.5,
  "fastWait": 0.5,
  "fastestWait": 0.5,
  "gasPriceRange": {
    "1200": 0.5,
    "1180": 0.5,
    "1160": 0.6,
    "1140": 0.6,
    "1120": 0.7,
    "1100": 0.7,
    "1080": 1.2,
    "1060": 1.5,
    "1040": 11.5,
    "1020": 12.9,
    "1000": 14.3,
    "980": 17.4,
    "960": 18.9,
    "940": 21.1,
    "920": 222.1,
    "900": 222.1,
    "880": 222.1,
    "860": 222.1,
    "840": 222.1,
    "820": 222.1,
    "800": 222.1,
    "780": 222.1,
    "760": 222.1,
    "740": 222.1,
    "720": 222.1,
    "700": 222.1,
    "680": 222.1,
    "660": 222.1,
    "640": 222.1,
    "620": 222.1,
    "600": 222.1,
    "580": 222.1,
    "560": 222.1,
    "540": 222.1,
    "520": 222.1,
    "500": 222.1,
    "480": 222.1,
    "460": 222.1,
    "440": 222.1,
    "420": 222.1,
    "400": 222.1,
    "380": 222.1,
    "360": 222.1,
    "340": 222.1,
    "320": 222.1,
    "300": 222.1,
    "280": 222.1,
    "260": 222.1,
    "240": 222.1,
    "220": 222.1,
    "200": 222.1,
    "190": 222.1,
    "180": 222.1,
    "170": 222.1,
    "160": 222.1,
    "150": 222.1,
    "140": 222.1,
    "130": 222.1,
    "120": 222.1,
    "110": 222.1,
    "100": 222.1,
    "90": 222.1,
    "80": 222.1,
    "70": 222.1,
    "60": 222.1,
    "50": 222.1,
    "40": 222.1,
    "30": 222.1,
    "20": 222.1,
    "10": 222.1,
    "8": 222.1,
    "6": 222.1,
    "4": 222.1,
    "1050": 1.5
  }
}

{
  "fast": 1200.0,
  "fastest": 1200.0,
  "safeLow": 1020.0,
  "average": 1050.0,
  "block_time": 13.327868852459016,
  "blockNum": 11900622,
  "speed": 0.997822721438169,
  "safeLowWait": 12.9,
  "avgWait": 1.5,
  "fastWait": 0.5,
  "fastestWait": 0.5,
  "gasPriceRange": {
    "1200": 0.5,
    "1180": 0.5,
    "1160": 0.6,
    "1140": 0.6,
    "1120": 0.7,
    "1100": 0.7,
    "1080": 1.2,
    "1060": 1.5,
    "1040": 11.5,
    "1020": 12.9,
    "1000": 14.3,
    "980": 17.4,
    "960": 18.9,
    "940": 21.1,
    "920": 222.1,
    "900": 222.1,
    "880": 222.1,
    "860": 222.1,
    "840": 222.1,
    "820": 222.1,
    "800": 222.1,
    "780": 222.1,
    "760": 222.1,
    "740": 222.1,
    "720": 222.1,
    "700": 222.1,
    "680": 222.1,
    "660": 222.1,
    "640": 222.1,
    "620": 222.1,
    "600": 222.1,
    "580": 222.1,
    "560": 222.1,
    "540": 222.1,
    "520": 222.1,
    "500": 222.1,
    "480": 222.1,
    "460": 222.1,
    "440": 222.1,
    "420": 222.1,
    "400": 222.1,
    "380": 222.1,
    "360": 222.1,
    "340": 222.1,
    "320": 222.1,
    "300": 222.1,
    "280": 222.1,
    "260": 222.1,
    "240": 222.1,
    "220": 222.1,
    "200": 222.1,
    "190": 222.1,
    "180": 222.1,
    "170": 222.1,
    "160": 222.1,
    "150": 222.1,
    "140": 222.1,
    "130": 222.1,
    "120": 222.1,
    "110": 222.1,
    "100": 222.1,
    "90": 222.1,
    "80": 222.1,
    "70": 222.1,
    "60": 222.1,
    "50": 222.1,
    "40": 222.1,
    "30": 222.1,
    "20": 222.1,
    "10": 222.1,
    "8": 222.1,
    "6": 222.1,
    "4": 222.1,
    "1050": 1.5
  }
}

etherchain.org

endpoint url

{"safeLow":1,"standard":1,"fast":1.5,"fastest":2,"currentBaseFee":72.5,"recommendedBaseFee":147.2}

{ "safeLow": 102, "standard": 105, "fast": 114.6, "fastest": 120 }

etherchain-gasnow

https://etherchain.org/api/gasnow

{code: 200, data: {rapid: 60000000000, fast: 39962373278, standard: 24406984375, slow: 19550000000,…}}

code: 200
data: {rapid: 60000000000, fast: 39962373278, standard: 24406984375, slow: 19550000000,…}
fast: 39962373278
priceUSD: 1818.52
rapid: 60000000000
slow: 19550000000
standard: 24406984375
timestamp: 1654245505826

Response

{"code":200,"data":{"rapid":65265049007,"fast":49988581398,"standard":23000000000,"slow":19550000000,"timestamp":1654245243247,"priceUSD":1818.52}}

Schema

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "$id": "etherchain_gasnow",
  "type": "object",
  "properties": {
    "code": {
      "type": "integer"
    },
    "data": {
      "type": "object",
      "properties": {
        "rapid": {
          "type": "integer"
        },
        "fast": {
          "type": "integer"
        },
        "standard": {
          "type": "integer"
        },
        "slow": {
          "type": "integer"
        },
        "timestamp": {
          "type": "integer"
        },
        "priceUSD": {
          "type": "number"
        }
      },
      "required": [
        "rapid",
        "fast",
        "standard",
        "slow",
        "timestamp",
        "priceUSD"
      ]
    }
  },
  "required": [
    "code",
    "data"
  ]
}

poanetwork

endpoint url

{
  "health": true,
  "block_number": 11900628,
  "slow": 101.0,
  "standard": 107.0,
  "fast": 115.0,
  "instant": 130.8,
  "block_time": 13.191
}

{
  "health": true,
  "block_number": 11900628,
  "slow": 101.0,
  "standard": 107.0,
  "fast": 115.0,
  "instant": 130.8,
  "block_time": 13.191
}

Zoltu

nanoeth is the SI nomenclature for gwei

{
  "number_of_blocks": 200,
  "latest_block_number": 11907178,
  "percentile_1": "1e-9 nanoeth",
  "percentile_2": "0.00001 nanoeth",
  "percentile_3": "0.000011001 nanoeth",
  "percentile_4": "1 nanoeth",
  "percentile_5": "6 nanoeth",
  "percentile_10": "10 nanoeth",
  "percentile_15": "152 nanoeth",
  "percentile_20": "170 nanoeth",
  "percentile_25": "181.5 nanoeth",
  "percentile_30": "190.000001459 nanoeth",
  "percentile_35": "200 nanoeth",
  "percentile_40": "214.76 nanoeth",
  "percentile_45": "222.814063547 nanoeth",
  "percentile_50": "229.9 nanoeth",
  "percentile_55": "232 nanoeth",
  "percentile_60": "245 nanoeth",
  "percentile_65": "256 nanoeth",
  "percentile_70": "262 nanoeth",
  "percentile_75": "270.6 nanoeth",
  "percentile_80": "278 nanoeth",
  "percentile_85": "289.02 nanoeth",
  "percentile_90": "300 nanoeth",
  "percentile_95": "314.4 nanoeth",
  "percentile_96": "315.21 nanoeth",
  "percentile_97": "316.075841562 nanoeth",
  "percentile_98": "325 nanoeth",
  "percentile_99": "326 nanoeth",
  "percentile_100": "348 nanoeth"
}

MyCrypto

{
  "safeLow": 159,
  "standard": 184,
  "fast": 262,
  "fastest": 289,
  "blockNum": 11907235
}

{
  "safeLow": 159,
  "standard": 184,
  "fast": 262,
  "fastest": 289,
  "blockNum": 11907235
}

EtherScan

api endpoint key required

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "11907242",
    "SafeGasPrice": "248",
    "ProposeGasPrice": "269",
    "FastGasPrice": "294"
  }
}

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "11907242",
    "SafeGasPrice": "248",
    "ProposeGasPrice": "269",
    "FastGasPrice": "294"
  }
}

Zapper

http://api.zapper.fi/v1/gas-price

{
  "standard": 113,
  "fast": 114,
  "instant": 136
}

archerdao

https://api.archerdao.io/v1/gas

{
  "code": 200,
  "data": {
    "immediate": "228202648099",
    "rapid": "67236905683",
    "fast": "13591066085",
    "standard": "1101380018",
    "slow": "0",
    "slower": "0",
    "slowest": "0"
  }
}

gas-ticker

Gas Ticker by ricmoo

{
  "blockNumber": 14610954,
  "timestamp": 1650309194.438,
  "slow": {
    "min": 29.397486945,
    "max": 70.143180307,
    "sum": 13465.490242759988,
    "count": 385,
    "mean": 34.97529933184413,
    "median": 35,
    "tp90": 38,
    "stdDev": 5.992331436594249,
    "target90": 37.265690661,
    "targetStdDev": 2.7612260317587007,
    "targetCount": 266,
    "targetBest": 30,
    "targetWorst": 39.532494062
  },
  "medium": {
    "min": 29.397486945,
    "max": 62.428616398,
    "sum": 29594.27666106807,
    "count": 680,
    "mean": 43.520995089805986,
    "median": 39.038827568,
    "tp90": 52.433561707,
    "stdDev": 8.816041449214934,
    "target90": 50,
    "targetStdDev": 4.467921632212077,
    "targetCount": 470,
    "targetBest": 34.911631032,
    "targetWorst": 52.3082
  },
  "fast": {
    "min": 29.397486945,
    "max": 1200.988196226,
    "sum": 753432.9418861985,
    "count": 14637,
    "mean": 51.47454682559257,
    "median": 48.554602972,
    "tp90": 59.570121624,
    "stdDev": 24.12932660961557,
    "target90": 60.216413805,
    "targetStdDev": 6.10997036680254,
    "targetCount": 10100,
    "targetBest": 38.822145579,
    "targetWorst": 64.139501286
  }
}

Appendix

Custom Network Over pricing

Metamask will pad the estimated gas without exceeding the most recent block gasLimit. However, If the network is a a custom network it will return the eth_estimateGas value

see metamask/controllers

URL Index

Current offchain list:

• https://gas,blocknative.com/
• https://ethgasstation.info/json/ethgasAPI.json
• https://www.etherchain.org/api/gasPriceOracle
• https://gasprice.poa.network/
• https://www.gasnow.org/api/v3/gas/price

EVM Params

EIP-2930: Optional Access List transactions

source, @fvictorio/gas-costs-after-berlin#EIP-2930-Optional-Access-List-transactions

This EIP adds a new type of transaction that can include an access list in the transaction payload. This means that you can declare beforehand which addresses and slots should be considered as accessed before the transaction’s execution starts. For example, an SLOAD of a non-accessed slot costs 2100, but if that slot was included in the transaction’s access list, then that same opcode will cost 100.

But if the gas costs are lower when an address or storage key is already accessed, does this mean that we can add everything to the transaction’s access list and get a gas reduction? Yay, free gas! Well, not exactly, because you also need to pay gas for each address and each storage key that you add.

Let’s see an example. Say we are sending a transaction to contract A. An access list could look like this:

accessList: [{
  address: "<address of A>",
  storageKeys: [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ]
}]

If we send a transaction with this access list, and the first opcode that uses the 0x0 slot is a SLOAD, it will cost 100 instead of 2100. That’s a gas reduction of 2000. But each storage key included in the transaction’s access list has a cost of 1900. So we only save 100 of gas. (If the first opcode to access that slot is an SSTORE instead, we would save 2100 of gas, which means that we’d save 200 of gas in total if we consider the cost of the storage key.)

You always pay gas for the address in the access list ("<address of A>" in the example).

Accessed addresses

So far, we’ve been talking only about the SLOAD and SSTORE opcodes, but those aren’t the only ones that change after Berlin. For example, the CALL opcode had a fixed cost of 700. But after EIP-2929 its cost is 2600 if the address is not in the access list and 100 if it is. And, like the accessed storage keys, it doesn’t matter what OPCODE accessed that address before (for example, if an EXTCODESIZE was called first, then that opcode will cost 2600, and any subsequent EXTCODESIZE, CALL, STATICCALL that uses the same address will cost 100).

How is this affected by transactions with access lists? For example, if we send a transaction to contract A, and that contract calls another contract B, then we can include an access list like this:

accessList: [{ address: "<address of B>", storageKeys: [] }]

We’ll have to pay a cost of 2400 to include this access list in the transaction, but then the first opcode that uses the address of B will cost 100 instead of 2600. So we saved 100 of gas by doing this. And if B uses its storage somehow and we know which keys it will use, then we can also include them in the access list and save 100/200 of gas for each one (depending on whether the first opcode is an SLOAD or an SSTORE).

But why are we talking about another contract? What happens with the contract that we are calling? Why don’t we do this?

accessList: [
  {address: "<address of A>", storageKeys: []},
  {address: "<address of B>", storageKeys: []},
]

We could do it, but it wouldn’t be worth it because EIP-2929 specifies that the address of the contract that is being called (that is, tx.to) is always included in the accessed_addresses list. So we are paying 2400 more for nothing.

Let’s analyze our example of the previous section again:

accessList: [{
  address: "<address of A>",
  storageKeys: [
    "0x0000000000000000000000000000000000000000000000000000000000000000"
  ]
}]

This will actually be wasteful unless we include several storage keys more. If we assume that a storage key is always used first by an SLOAD, then we need at least 24 storage keys just to break even.

As you can imagine, analyzing this and creating an access list by hand is not fun. Luckily, there is a better way.

eth_createAccessList

Geth (starting from version 1.10.2) includes a new eth_createAccessList RPC method that you can use to generate access lists. It is used like eth_estimateGas, but instead of a gas estimation, it returns something like this:

{
  "accessList": [
    {
      "address": "0xb0ee076d7779a6ce152283f009f4c32b5f88756c",
      "storageKeys": [
        "0x0000000000000000000000000000000000000000000000000000000000000000",
        "0x0000000000000000000000000000000000000000000000000000000000000001"
      ]
    }
  ],
  "gasUsed": "0x8496"
}

That is, it gives you the list of addresses and storage keys that will be used by that transaction, plus the gas consumed if the access list is included. (And, like eth_estimateGas, this is an estimation; the list could change when the transaction is actually mined.) But, again, this doesn’t mean that this gas will be lower than the gas used if you just send the same transaction without an access list!

Conclusion

Does this mean that we always save gas when using transaction’s with access lists? No.

Gas Fee Speed Definitions

• Fastest: next block (i.e. <30 seconds) <br>
• Fast: below 2 minutes (<10 blocks) <br>
• Medium: around 5 minutes (<20 blocks) <br>
• Slow: below 30 minutes (a.k.a safe-low, <120 blocks) <br>

Gas Reporting Table Format

Gas Reporting from forge test --gas-report

forge snapshot

Gas Snapshot Format

.gas-snapshot

FooTest:testSetFoo() (gas: 64071)
BarTest:testFuzzCurrentBar(uint256) (runs: 256, μ: 408, ~: 423)

JSON-Schema definition

Each test object represents a test function and has the following properties:

The oneOf constraint ensures that a test object must have either the gas property (for non-fuzz tests) or the runs, avg, and median properties (for fuzz tests).

This JSON Schema describes the structure of the .gas-snapshot file format used by Forge. It allows for both regular tests with a single gas value and fuzz tests with multiple runs and statistical data (average and median gas used).

gas-snapshot

The schema defines an object with a single property tests, which is an array of test objects.

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "tests": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "The name of the test function"
          },
          "gas": {
            "type": "integer",
            "description": "The gas used by the test function"
          },
          "runs": {
            "type": "integer",
            "description": "The number of runs for the test function (only applicable for fuzz tests)"
          },
          "avg": {
            "type": "integer",
            "description": "The average gas used across all runs (only applicable for fuzz tests)"
          },
          "median": {
            "type": "integer",
            "description": "The median gas used across all runs (only applicable for fuzz tests)"
          }
        },
        "required": [
          "name"
        ],
        "oneOf": [
          {
            "required": [
              "gas"
            ]
          },
          {
            "required": [
              "runs",
              "avg",
              "median"
            ]
          }
        ]
      }
    }
  },
  "required": [
    "tests"
  ]
}

Example output

╭──────────────────────────┬─────────────────┬───────┬────────┬───────┬─────────╮
│ GasMeterFactory contract ┆                 ┆       ┆        ┆       ┆         │
╞══════════════════════════╪═════════════════╪═══════╪════════╪═══════╪═════════╡
│ Deployment Cost          ┆ Deployment Size ┆       ┆        ┆       ┆         │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ 35287                    ┆ 206             ┆       ┆        ┆       ┆         │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ Function Name            ┆ min             ┆ avg   ┆ median ┆ max   ┆ # calls │
├╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤
│ build                    ┆ 38653           ┆ 38653 ┆ 38653  ┆ 38653 ┆ 15      │
╰──────────────────────────┴─────────────────┴───────┴────────┴───────┴─────────╯

eth_maxPriorityFeePerGas

Definition

https://github.com/ethereum/execution-apis/blob/main/src/eth/fee_market.yaml

The eth_maxPriorityFeePerGas was originally a client specific RPC Method (go-ethereum), it only recently was made part of the official Ethereum JSON-RPC specification. This method was introduced as part of the EIP-1559 (Ethereum Improvement Proposal 1559) transaction pricing mechanism implementation by the go-ethereum team. It is used to retrieve the current maximum priority fee per gas accepted for the network.

You can calculate a default maxPriorityFeePerGas using eth_feeHistory when eth_maxPriorityFeePerGas is not available.

Calculating the current maximum priority fee per gas

The eth_maxPriorityFeePerGas method allows users, wallets, and dApps to query the Ethereum node and obtain the current maximum priority fee per gas.

The priority fee is an additional fee that can be added to a transaction to incentivize miners to prioritize its inclusion in a block. The returned value represents the maximum priority fee per gas in wei, and this value is a dynamic parameter and can change over time depending on network congestion and block builder preferences.

It represents the maximum accepted priority fee at a given moment but does not guarantee that a transaction with that priority fee will be included in the next block. Inclusion depends on various factors such as gas price, gas limit, and transaction competition.

Go-Ethereum Calculation

Client implementations can vary, for example in go-ethereum (geth) it calculates what is the 60th percentile tip over the last 20 blocks by default.

https://github.com/ethereum/go-ethereum/blob/f265cc24b4b17b55b468b315303a3a599fc01d81/eth/ethconfig/config.go#L40-L47

// FullNodeGPO contains default gasprice oracle settings for full node.
var FullNodeGPO = gasprice.Config{
	Blocks:           20,
	Percentile:       60,
	MaxHeaderHistory: 1024,
	MaxBlockHistory:  1024,
	MaxPrice:         gasprice.DefaultMaxPrice,
	Igno

Usage:

To use this method, you need to send a JSON-RPC request to an Ethereum node with the method name eth_maxPriorityFeePerGas.

The request does not require any parameters.

eth_feeHistory

Definition

https://github.com/ethereum/execution-apis/blob/main/src/eth/fee_market.yaml

eth_feeHistory returns transaction base fee per gas and effective priority fee per gas for the requested/supported block range.

The request does require the following parameters:

blockCount: Requested range of blocks. Clients will return less than the requested range if not all blocks are available.
rewardPercentiles: A monotonically increasing list of percentile values. For each block in the requested range, the transactions will be sorted in ascending order by effective tip per gas and the corresponding effective tip for the percentile will be determined, accounting for gas consumed.
gasUsedRatio: An array of block gas used ratios. These are calculated as the ratio of gasUsed and gasLimit.

Gas Pricing API Providers and Oracles

Listed in no particular order.

Notice: GasNow as of 2021-10-01 will be shutting down due to SparkPools closure

Blocknative

@note there are two seperate entries

gas.blocknative.com

Note: This is powered by Blocknative's global mempool data platform

v2 Blocknative

{
    "system": "ethereum",
    "network": "main",
    "unit": "gwei",
    "maxPrice": 50,
    "currentBlockNumber": 15326495,
    "msSinceLastBlock": 40251,
    "blockPrices": [
        {
            "blockNumber": 15326496,
            "estimatedTransactionCount": 322,
            "baseFeePerGas": 11.075381056,
            "estimatedPrices": [
                {
                    "confidence": 99,
                    "price": 13,
                    "maxPriorityFeePerGas": 2.49,
                    "maxFeePerGas": 22.45
                },
                {
                    "confidence": 95,
                    "price": 13,
                    "maxPriorityFeePerGas": 2.13,
                    "maxFeePerGas": 22.09
                },
                {
                    "confidence": 90,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.92,
                    "maxFeePerGas": 21.88
                },
                {
                    "confidence": 80,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.68,
                    "maxFeePerGas": 21.64
                },
                {
                    "confidence": 70,
                    "price": 12,
                    "maxPriorityFeePerGas": 1.58,
                    "maxFeePerGas": 21.54
                }
            ]
        }
    ],
    "estimatedBaseFees": [
        {
            "pending+1": [
                {
                    "confidence": 99,
                    "baseFee": 12.46
                }
            ]
        },
        {
            "pending+2": [
                {
                    "confidence": 99,
                    "baseFee": 14.02
                }
            ]
        },
        {
            "pending+3": [
                {
                    "confidence": 99,
                    "baseFee": 15.77
                }
            ]
        },
        {
            "pending+4": [
                {
                    "confidence": 99,
                    "baseFee": 17.75
                }
            ]
        },
        {
            "pending+5": [
                {
                    "confidence": 99,
                    "baseFee": 19.96
                }
            ]
        }
    ]
}

v1 Blocknative

{
  "system": "ethereum",
  "network": "main",
  "unit": "gwei",
  "maxPrice": 336,
  "currentBlockNumber": 13095949,
  "msSinceLastBlock": 4542,
  "blockPrices": [
    {
      "blockNumber": 13095950,
      "baseFeePerGas": 113.110076547,
      "estimatedTransactionCount": 172,
      "estimatedPrices": [
        {
          "confidence": 99,
          "price": 129,
          "maxPriorityFeePerGas": 15.96,
          "maxFeePerGas": 242.18
        },
        {
          "confidence": 95,
          "price": 119,
          "maxPriorityFeePerGas": 6.84,
          "maxFeePerGas": 233.06
        },
        {
          "confidence": 90,
          "price": 118,
          "maxPriorityFeePerGas": 5.09,
          "maxFeePerGas": 231.31
        },
        {
          "confidence": 80,
          "price": 116,
          "maxPriorityFeePerGas": 3.21,
          "maxFeePerGas": 229.43
        },
        {
          "confidence": 70,
          "price": 115,
          "maxPriorityFeePerGas": 2.28,
          "maxFeePerGas": 228.5
        }
      ]
    }
  ]
}

bnc-ext

BlockNative Chrome Extenstion

blocknative eth gas estimate extenstion

https://blocknative-api.herokuapp.com/data

sample response

{
  "pendingBlockNumberVal": 13378149,
  "seconds": 17,
  "maxPrice": 768,
  "estimatedTransactions": 279,
  "estimatedPrices": [{
    "confidence": 99,
    "price": 86,
    "maxPriorityFeePerGas": 2.96,
    "maxFeePerGas": 170.76
  }, {
    "confidence": 95,
    "price": 85,
    "maxPriorityFeePerGas": 1.75,
    "maxFeePerGas": 169.55
  }, {
    "confidence": 90,
    "price": 85,
    "maxPriorityFeePerGas": 1.56,
    "maxFeePerGas": 169.36
  }, {
    "confidence": 80,
    "price": 85,
    "maxPriorityFeePerGas": 1.48,
    "maxFeePerGas": 169.28
  }, {
    "confidence": 70,
    "price": 85,
    "maxPriorityFeePerGas": 1.37,
    "maxFeePerGas": 169.17
  }],
  "baseFeePerGas": 83.897778652
}

Curve-Finance

getGas

https://api.curve.fi/api/getGas

 https://api.curve.fi/api/getGas

{
    "success": true,
    "data": {
        "gas": {
            "rapid": 36000000000,
            "fast": 35000000000,
            "standard": 35000000000,
            "slow": 35000000000
        },
        "eip1559Gas": {
            "base": 35292604977,
            "prio": [
                1220000000,
                500000000,
                350000000,
                230000000
            ],
            "max": [
                56110000000,
                55390000000,
                55240000000,
                55120000000
            ]
        }
    },
    "generatedTimeMs": 1668181797396
}

WalletConnect

specification

https://github.com/pedrouid/ethereum-api#api

https://ethereum-api.xyz/gas-prices

http GET https://ethereum-api.xyz/gas-prices

sample response

{
  "timestamp": 1633172858972,
  "slow": {
    "time": 756,
    "price": 39
  },
  "average": {
    "time": 84,
    "price": 42
  },
  "fast": {
    "time": 30,
    "price": 54
  },
  "fastest": {
    "time": 24,
    "price": 58
  }
}

Flashbots

eth_gasFee

specification

see source documentation

// prettier-ignore

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    block,                     // Number, current block number
    baseFeePerGas,             // String, a hex number for the baseFee at the current block
    default: {
      maxFeePerGas,            // String, a hex number for the recommended default maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended default maxPriorityFeePerGas
    },
    low: {
      maxFeePerGas,            // String, a hex number for the recommended low maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended low maxPriorityFeePerGas
    },
    med: {
      maxFeePerGas,            // String, a hex number for the recommended med maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended med maxPriorityFeePerGas
    },
    high: {
      maxFeePerGas,            // String, a hex number for the recommended high maxFeePerGas
      maxPriorityFeePerGas,    // String, a hex number for the recommended high maxPriorityFeePerGas
    },
  }
}

request sample

curl -s -L -X POST 'https://protection.flashbots.net/v1/rpc' \
-H 'Content-Type: application/json' \
--data-raw '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_gasFees",
  "params": []
}'

response

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "block": 13467179,
        "baseFeePerGas": "0x0bd0606957",
        "default": {
            "maxFeePerGas": "0x12ec776ebc",
            "maxPriorityFeePerGas": "0x01e47257df"
        },
        "low": {
            "maxFeePerGas": "0x11d7682749",
            "maxPriorityFeePerGas": "0xe45ecec3"
        },
        "med": {
            "maxFeePerGas": "0x12ec776ebc",
            "maxPriorityFeePerGas": "0x01e47257df"
        },
        "high": {
            "maxFeePerGas": "0x1412552c31",
            "maxPriorityFeePerGas": "0x0302bff9d4"
        }
    }
}

EtherScan

https://docs.etherscan.io/api-endpoints/gas-tracker

https://api.etherscan.io/api?module=gastracker&action=gasoracle&apikey=YourApiKeyToken

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "13053741",
    "SafeGasPrice": "20",
    "ProposeGasPrice": "22",
    "FastGasPrice": "24",
    "suggestBaseFee": "19.230609716",
    "gasUsedRatio": "0.370119078777807,0.8954731,0.550911766666667,0.212457033333333,0.552463633333333"
  }
}

GasNow [no longer in service]

gasnow.org/taichi

wss://www.gasnow.org/ws

{
  "type": "gasprice",
  "data": {
    "gasPrices": {
      "rapid": 67000000000,
      "fast": 64455346560,
      "standard": 63455346560,
      "slow": 63455346560
    },
    "cumulativeCounts": [
      {
        "gwei": "63",
        "cumulativeCount": 93
      },
      {
        "gwei": "64",
        "cumulativeCount": 81
      },
      {
        "gwei": "65",
        "cumulativeCount": 65
      },
      {
        "gwei": "66",
        "cumulativeCount": 35
      },
      {
        "gwei": "67",
        "cumulativeCount": 34
      },
      {
        "gwei": "68",
        "cumulativeCount": 32
      },
      {
        "gwei": "69",
        "cumulativeCount": 30
      },
      {
        "gwei": "70",
        "cumulativeCount": 25
      },
      {
        "gwei": "71",
        "cumulativeCount": 22
      },
      {
        "gwei": "73",
        "cumulativeCount": 21
      },
      {
        "gwei": "74",
        "cumulativeCount": 19
      },
      {
        "gwei": "75",
        "cumulativeCount": 17
      },
      {
        "gwei": "78",
        "cumulativeCount": 16
      },
      {
        "gwei": "80",
        "cumulativeCount": 15
      },
      {
        "gwei": "81",
        "cumulativeCount": 13
      },
      {
        "gwei": "87",
        "cumulativeCount": 12
      },
      {
        "gwei": "88",
        "cumulativeCount": 11
      },
      {
        "gwei": "89",
        "cumulativeCount": 9
      },
      {
        "gwei": "94",
        "cumulativeCount": 8
      },
      {
        "gwei": "96",
        "cumulativeCount": 6
      },
      {
        "gwei": "98",
        "cumulativeCount": 5
      },
      {
        "gwei": "109",
        "cumulativeCount": 4
      },
      {
        "gwei": "112",
        "cumulativeCount": 3
      },
      {
        "gwei": "120",
        "cumulativeCount": 2
      },
      {
        "gwei": "221",
        "cumulativeCount": 1
      }
    ],
    "timestamp": 1629975608579
  }
}

GasNow Legacy

{
  "code": 200,
  "data": {
    "rapid": 131000000000,
    "fast": 116000000000,
    "standard": 100000000000,
    "slow": 91600000000,
    "timestamp": 1613914581546
  }
}

Gnosis

endpoint url

{
  "lastUpdate": "2021-02-21T13:38:38.945308Z",
  "lowest": "2",
  "safeLow": "109000000001",
  "standard": "119000000001",
  "fast": "131000000001",
  "fastest": "10680081443136"
}

MetaMask

Consensys CoDeFi

endpoint url

{
  "low": {
    "suggestedMaxPriorityFeePerGas": "1.37826449268",
    "suggestedMaxFeePerGas": "70.067746222",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 30000
  },
  "medium": {
    "suggestedMaxPriorityFeePerGas": "1.5",
    "suggestedMaxFeePerGas": "81.637728684",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 45000
  },
  "high": {
    "suggestedMaxPriorityFeePerGas": "2",
    "suggestedMaxFeePerGas": "93.585975639",
    "minWaitTimeEstimate": 15000,
    "maxWaitTimeEstimate": 60000
  },
  "estimatedBaseFee": "57.241234774",
   "networkCongestion": 0.5,
}

{
  "SafeGasPrice": "100",
  "ProposeGasPrice": "108",
  "FastGasPrice": "119"
}

1inch

https://gas-price-api.1inch.exchange/v1.0

v1.0

{
  "fast": 96820000000,
  "instant": 125000000000,
  "standard": 90000000000,
  "slow": 82000000000
}

v1.2

gas-price-api.1inch.io/v.1.2

{
    "baseFee": "93731028208",
    "low": {
        "maxPriorityFeePerGas": "1170000000",
        "maxFeePerGas": "94901028208"
    },
    "medium": {
        "maxPriorityFeePerGas": "2340000000",
        "maxFeePerGas": "96071028208"
    },
    "high": {
        "maxPriorityFeePerGas": "5850000000",
        "maxFeePerGas": "99581028208"
    },
    "instant": {
        "maxPriorityFeePerGas": "5850000000",
        "maxFeePerGas": "129455336670"
    }
}

ethGasStation

endpoint url

{
  "fast": 1200.0,
  "fastest": 1200.0,
  "safeLow": 1020.0,
  "average": 1050.0,
  "block_time": 13.327868852459016,
  "blockNum": 11900622,
  "speed": 0.997822721438169,
  "safeLowWait": 12.9,
  "avgWait": 1.5,
  "fastWait": 0.5,
  "fastestWait": 0.5,
  "gasPriceRange": {
    "1200": 0.5,
    "1180": 0.5,
    "1160": 0.6,
    "1140": 0.6,
    "1120": 0.7,
    "1100": 0.7,
    "1080": 1.2,
    "1060": 1.5,
    "1040": 11.5,
    "1020": 12.9,
    "1000": 14.3,
    "980": 17.4,
    "960": 18.9,
    "940": 21.1,
    "920": 222.1,
    "900": 222.1,
    "880": 222.1,
    "860": 222.1,
    "840": 222.1,
    "820": 222.1,
    "800": 222.1,
    "780": 222.1,
    "760": 222.1,
    "740": 222.1,
    "720": 222.1,
    "700": 222.1,
    "680": 222.1,
    "660": 222.1,
    "640": 222.1,
    "620": 222.1,
    "600": 222.1,
    "580": 222.1,
    "560": 222.1,
    "540": 222.1,
    "520": 222.1,
    "500": 222.1,
    "480": 222.1,
    "460": 222.1,
    "440": 222.1,
    "420": 222.1,
    "400": 222.1,
    "380": 222.1,
    "360": 222.1,
    "340": 222.1,
    "320": 222.1,
    "300": 222.1,
    "280": 222.1,
    "260": 222.1,
    "240": 222.1,
    "220": 222.1,
    "200": 222.1,
    "190": 222.1,
    "180": 222.1,
    "170": 222.1,
    "160": 222.1,
    "150": 222.1,
    "140": 222.1,
    "130": 222.1,
    "120": 222.1,
    "110": 222.1,
    "100": 222.1,
    "90": 222.1,
    "80": 222.1,
    "70": 222.1,
    "60": 222.1,
    "50": 222.1,
    "40": 222.1,
    "30": 222.1,
    "20": 222.1,
    "10": 222.1,
    "8": 222.1,
    "6": 222.1,
    "4": 222.1,
    "1050": 1.5
  }
}

{
  "fast": 1200.0,
  "fastest": 1200.0,
  "safeLow": 1020.0,
  "average": 1050.0,
  "block_time": 13.327868852459016,
  "blockNum": 11900622,
  "speed": 0.997822721438169,
  "safeLowWait": 12.9,
  "avgWait": 1.5,
  "fastWait": 0.5,
  "fastestWait": 0.5,
  "gasPriceRange": {
    "1200": 0.5,
    "1180": 0.5,
    "1160": 0.6,
    "1140": 0.6,
    "1120": 0.7,
    "1100": 0.7,
    "1080": 1.2,
    "1060": 1.5,
    "1040": 11.5,
    "1020": 12.9,
    "1000": 14.3,
    "980": 17.4,
    "960": 18.9,
    "940": 21.1,
    "920": 222.1,
    "900": 222.1,
    "880": 222.1,
    "860": 222.1,
    "840": 222.1,
    "820": 222.1,
    "800": 222.1,
    "780": 222.1,
    "760": 222.1,
    "740": 222.1,
    "720": 222.1,
    "700": 222.1,
    "680": 222.1,
    "660": 222.1,
    "640": 222.1,
    "620": 222.1,
    "600": 222.1,
    "580": 222.1,
    "560": 222.1,
    "540": 222.1,
    "520": 222.1,
    "500": 222.1,
    "480": 222.1,
    "460": 222.1,
    "440": 222.1,
    "420": 222.1,
    "400": 222.1,
    "380": 222.1,
    "360": 222.1,
    "340": 222.1,
    "320": 222.1,
    "300": 222.1,
    "280": 222.1,
    "260": 222.1,
    "240": 222.1,
    "220": 222.1,
    "200": 222.1,
    "190": 222.1,
    "180": 222.1,
    "170": 222.1,
    "160": 222.1,
    "150": 222.1,
    "140": 222.1,
    "130": 222.1,
    "120": 222.1,
    "110": 222.1,
    "100": 222.1,
    "90": 222.1,
    "80": 222.1,
    "70": 222.1,
    "60": 222.1,
    "50": 222.1,
    "40": 222.1,
    "30": 222.1,
    "20": 222.1,
    "10": 222.1,
    "8": 222.1,
    "6": 222.1,
    "4": 222.1,
    "1050": 1.5
  }
}

etherchain.org

endpoint url

{"safeLow":1,"standard":1,"fast":1.5,"fastest":2,"currentBaseFee":72.5,"recommendedBaseFee":147.2}

{ "safeLow": 102, "standard": 105, "fast": 114.6, "fastest": 120 }

etherchain-gasnow

https://etherchain.org/api/gasnow

{code: 200, data: {rapid: 60000000000, fast: 39962373278, standard: 24406984375, slow: 19550000000,…}}

code: 200
data: {rapid: 60000000000, fast: 39962373278, standard: 24406984375, slow: 19550000000,…}
fast: 39962373278
priceUSD: 1818.52
rapid: 60000000000
slow: 19550000000
standard: 24406984375
timestamp: 1654245505826

Response

{"code":200,"data":{"rapid":65265049007,"fast":49988581398,"standard":23000000000,"slow":19550000000,"timestamp":1654245243247,"priceUSD":1818.52}}

Schema

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "$id": "etherchain_gasnow",
  "type": "object",
  "properties": {
    "code": {
      "type": "integer"
    },
    "data": {
      "type": "object",
      "properties": {
        "rapid": {
          "type": "integer"
        },
        "fast": {
          "type": "integer"
        },
        "standard": {
          "type": "integer"
        },
        "slow": {
          "type": "integer"
        },
        "timestamp": {
          "type": "integer"
        },
        "priceUSD": {
          "type": "number"
        }
      },
      "required": [
        "rapid",
        "fast",
        "standard",
        "slow",
        "timestamp",
        "priceUSD"
      ]
    }
  },
  "required": [
    "code",
    "data"
  ]
}

poanetwork

endpoint url

{
  "health": true,
  "block_number": 11900628,
  "slow": 101.0,
  "standard": 107.0,
  "fast": 115.0,
  "instant": 130.8,
  "block_time": 13.191
}

{
  "health": true,
  "block_number": 11900628,
  "slow": 101.0,
  "standard": 107.0,
  "fast": 115.0,
  "instant": 130.8,
  "block_time": 13.191
}

Zoltu

nanoeth is the SI nomenclature for gwei

{
  "number_of_blocks": 200,
  "latest_block_number": 11907178,
  "percentile_1": "1e-9 nanoeth",
  "percentile_2": "0.00001 nanoeth",
  "percentile_3": "0.000011001 nanoeth",
  "percentile_4": "1 nanoeth",
  "percentile_5": "6 nanoeth",
  "percentile_10": "10 nanoeth",
  "percentile_15": "152 nanoeth",
  "percentile_20": "170 nanoeth",
  "percentile_25": "181.5 nanoeth",
  "percentile_30": "190.000001459 nanoeth",
  "percentile_35": "200 nanoeth",
  "percentile_40": "214.76 nanoeth",
  "percentile_45": "222.814063547 nanoeth",
  "percentile_50": "229.9 nanoeth",
  "percentile_55": "232 nanoeth",
  "percentile_60": "245 nanoeth",
  "percentile_65": "256 nanoeth",
  "percentile_70": "262 nanoeth",
  "percentile_75": "270.6 nanoeth",
  "percentile_80": "278 nanoeth",
  "percentile_85": "289.02 nanoeth",
  "percentile_90": "300 nanoeth",
  "percentile_95": "314.4 nanoeth",
  "percentile_96": "315.21 nanoeth",
  "percentile_97": "316.075841562 nanoeth",
  "percentile_98": "325 nanoeth",
  "percentile_99": "326 nanoeth",
  "percentile_100": "348 nanoeth"
}

MyCrypto

{
  "safeLow": 159,
  "standard": 184,
  "fast": 262,
  "fastest": 289,
  "blockNum": 11907235
}

{
  "safeLow": 159,
  "standard": 184,
  "fast": 262,
  "fastest": 289,
  "blockNum": 11907235
}

EtherScan

api endpoint key required

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "11907242",
    "SafeGasPrice": "248",
    "ProposeGasPrice": "269",
    "FastGasPrice": "294"
  }
}

{
  "status": "1",
  "message": "OK",
  "result": {
    "LastBlock": "11907242",
    "SafeGasPrice": "248",
    "ProposeGasPrice": "269",
    "FastGasPrice": "294"
  }
}

Zapper

http://api.zapper.fi/v1/gas-price

{
  "standard": 113,
  "fast": 114,
  "instant": 136
}

archerdao

https://api.archerdao.io/v1/gas

{
  "code": 200,
  "data": {
    "immediate": "228202648099",
    "rapid": "67236905683",
    "fast": "13591066085",
    "standard": "1101380018",
    "slow": "0",
    "slower": "0",
    "slowest": "0"
  }
}

gas-ticker

Gas Ticker by ricmoo

{
  "blockNumber": 14610954,
  "timestamp": 1650309194.438,
  "slow": {
    "min": 29.397486945,
    "max": 70.143180307,
    "sum": 13465.490242759988,
    "count": 385,
    "mean": 34.97529933184413,
    "median": 35,
    "tp90": 38,
    "stdDev": 5.992331436594249,
    "target90": 37.265690661,
    "targetStdDev": 2.7612260317587007,
    "targetCount": 266,
    "targetBest": 30,
    "targetWorst": 39.532494062
  },
  "medium": {
    "min": 29.397486945,
    "max": 62.428616398,
    "sum": 29594.27666106807,
    "count": 680,
    "mean": 43.520995089805986,
    "median": 39.038827568,
    "tp90": 52.433561707,
    "stdDev": 8.816041449214934,
    "target90": 50,
    "targetStdDev": 4.467921632212077,
    "targetCount": 470,
    "targetBest": 34.911631032,
    "targetWorst": 52.3082
  },
  "fast": {
    "min": 29.397486945,
    "max": 1200.988196226,
    "sum": 753432.9418861985,
    "count": 14637,
    "mean": 51.47454682559257,
    "median": 48.554602972,
    "tp90": 59.570121624,
    "stdDev": 24.12932660961557,
    "target90": 60.216413805,
    "targetStdDev": 6.10997036680254,
    "targetCount": 10100,
    "targetBest": 38.822145579,
    "targetWorst": 64.139501286
  }
}

Appendix

Custom Network Over pricing

Metamask will pad the estimated gas without exceeding the most recent block gasLimit. However, If the network is a a custom network it will return the eth_estimateGas value

see metamask/controllers

URL Index

Current offchain list:

• https://gas,blocknative.com/
• https://ethgasstation.info/json/ethgasAPI.json
• https://www.etherchain.org/api/gasPriceOracle
• https://gasprice.poa.network/
• https://www.gasnow.org/api/v3/gas/price

EVM Params