Gas Price API

Accurate next block gas price estimation.

The Gas Price API gives you the gas price needed to have a certain probability to qualify for inclusion in the next block (for Ethereum or Polygon) or the next ∼10 seconds, depending on the chain. Need a high probability of being confirmed at the expense of spending extra gas? Use the 99% probability prediction. Don't mind if the transaction takes longer to confirm? Use the 50% probability prediction.

Gas Platform currently supports the following networks

Network Name	Chain ID
ethereum main	1
optimism mainnet	10
polygon mainnet	137
fantom mainnet	250
zksync mainnet	324
sei-pacific-1	1329
base mainnet	8453
arbitrum one mainnet	42161
linea mainnet	59144
blast mainnet	81457

You can view an introductory video on Gas Platform here.

Looking for a network that's not currently supported? Let us know by using our contact form here.

Authentication

A valid Blocknative API key is required in the Authorization Header of every request. Request an API key here.

API Endpoint

GET https://api.blocknative.com/gasprices/blockprices

Returns a range of confidence intervals for gas prices needed to qualify a transaction for inclusion in the next block or next ∼10 seconds, depending on the chain. The order of confidence intervals is subject to change.

Rate Limits

Each endpoint is limited to provide updated results once per second for paid tier API keys, or every 5 seconds for free tier API keys. Polling faster than these rates may deliver stale data.

Request

Example request

curl -H "Authorization: your-apikey-here" https://api.blocknative.com/gasprices/blockprices

Example non-default chain request

curl -H "Authorization: your-apikey-here" https://api.blocknative.com/gasprices/blockprices?chainid=137

Example custom confidence level request

curl -H "Authorization: your-apikey-here" https://api.blocknative.com/gasprices/blockprices?confidenceLevels=10&confidenceLevels=30&confidenceLevels=50&confidenceLevels=70&confidenceLevels=90

Example Response Payload

{
  "system": "ethereum",
  "network": "main",
  "unit": "gwei",
  "maxPrice": 25,
  "currentBlockNumber": 19420156,
  "msSinceLastBlock": 8303,
  "blockPrices": [
    {
      "blockNumber": 19420156,
      "estimatedTransactionCount": 58,
      "baseFeePerGas": 20.118985095,
      "blobBaseFeePerGas": 1e-9,
      "estimatedPrices": [
        {
          "confidence": 99,
          "price": 20,
          "maxPriorityFeePerGas": 0.1,
          "maxFeePerGas": 24.12
        },
        {
          "confidence": 95,
          "price": 20,
          "maxPriorityFeePerGas": 0.09,
          "maxFeePerGas": 24.11
        },
        {
          "confidence": 90,
          "price": 20,
          "maxPriorityFeePerGas": 0.09,
          "maxFeePerGas": 24.11
        },
        {
          "confidence": 80,
          "price": 20,
          "maxPriorityFeePerGas": 0.08,
          "maxFeePerGas": 24.1
        },
        {
          "confidence": 70,
          "price": 20,
          "maxPriorityFeePerGas": 0.07,
          "maxFeePerGas": 24.09
        }
      ]
    }
  ]
}

Header

Name	Type	Description
Authorization	string	Valid apikey

200 Success

{
    "system": "ethereum",
    "network": "main",
    "unit": "gwei",
    "maxPrice": Number, // Highest priced transaction in the mempool
    "currentBlockNumber": Number, // Block number at time of prediction
    "msSinceLastBlock": Number, // Milliseconds since the last block was mined relative to when this data was computed
    "blockPrices": [
        {
            "blockNumber": Number, // Block this prediction is for
            "estimatedTransactionCount": Number, // Number of items we estimate will be included in next block based on mempool snapshot
            "baseFeePerGas": 1, // Base fee per gas for current block in gwei
            "blobBaseFeePerGas": Number // Base fee per gas for blobs for current block in gwei.
            "estimatedPrices": [
                {
                    "confidence": Number, // 0-99 likelihood the next block will contain a transaction with a gas price >= to the listed price  
                    "price": Number, // Price in gwei
                    "maxPriorityFeePerGas": Number, // Max priority fee per gas in gwei
                    "maxFeePerGas": Number, // Max fee per gas in gwei
                },
                ...,
            ]
        }
    ]
}

401 Key invalid or not provided

{
    "msg": "Authorization header must contain a valid apikey"
}

429 Rate limit exceeded. Refer to the headers for when to retry the request.

{ "msg":"Too Many Requests" }

Query Parameters

Name	Type	Description
confidenceLevels	integer	Override default confidence level order (99,95,90,80,70) in response with up to 5 confidence levels. Ethereum Mainnet confidence levels are from 1 - 99 (increments of 1)
n	integer	Ethereum Only. Override 'estimatedTransactionCount' (see example response). Used to estimate how many transactions will fit in the next block.
chainid	integer	The network chain ID. Default is 1 (Ethereum Mainnet).

Type0 and Type2 Transactions

Type0 transactions (Pre EIP-1559) should utilize the Price number under each confidence level. Type2 transactions (EIP-1559) should utilize the values for maxPriorityFeePerGas (also known as the "tip") and maxFeePerGas .

Description of Terms

Term	Description
maxPrice	Highest priced transaction in the mempool.
currentBlockNumber	Block number at the time of prediction.
msSinceLastBlock	Milliseconds since the last block was mined relative to when data was computed.
blockNumber	Block this prediction is for.
estimatedTransaction Count	Number of items we estimate will be included in next block based on mempool snapshot.
baseFeePerGas	Base fee per gas for current block in gwei. (Only type2 transactions Post EIP-1559 have this value and it's burned by the network upon transaction success).
blobBaseFeePerGas	Base fee per gas for blobs for current block in gwei. (Only type3 transactions Post EIP-4844 have this value and it's burned by the network upon transaction success).
estimatedPrices -> confidence	The likelihood the next block will contain a transaction with a price >= to the listed price.
estimatedPrices -> price	Price in Gwei (used for type0 transactions: Pre EIP-1559).
estimatedPrices -> maxPriorityFeePerGas	Max priority fee per gas in gwei also known as the "tip" (used for type2 transactions: EIP-1559).
estimatedPrices -> maxFeePerGas	Max fee per gas in gwei (used for type2 transactions: EIP-1559). maxFeePerGas is computed from baseFeePerGas prediction ∼10 seconds after the current pending block + maxPriorityFeePerGas.