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

Name

Network

Chain ID

Arbitrum One

mainnet

42161

Avalanche

mainnet

43114

Base

mainnet

8453

Blast

mainnet

81457

Chiliz

mainnet

88888

Cronos

mainnet

Ethereum

mainnet

Fantom

mainnet

250

Gnosis

mainnet

100

Immutable zkEVM

mainnet

204

Linea

mainnet

59144

Lisk

mainnet

1135

Mantle

mainnet

5000

Moonbeam

mainnet

1284

opBNB

mainnet

13371

Optimism

mainnet

Polygon

mainnet

137

Ronin

mainnet

2020

Scroll

mainnet

534352

SEI

pacific-1

1329

ZetaChain

mainnet

7000

ZKsync

mainnet

324

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 OPTIONAL in the Authorization Header of every request. Request an API key here.

A free API key is recommended for more generous rate limits and future features.

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: optional-apikey-here' 'https://api.blocknative.com/gasprices/blockprices'

Or without the optional apikey

curl 'https://api.blocknative.com/gasprices/blockprices'

Example non-default chain request

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

Example custom confidence level request

curl -H 'Authorization: optional-apikey-here' 'https://api.blocknative.com/gasprices/blockprices?chainid=1&confidenceLevels=50&confidenceLevels=70&confidenceLevels=80&confidenceLevels=90&confidenceLevels=99'

An alternative format for confidence levels is

curl -H 'Authorization: optional-apikey-here' 'https://api.blocknative.com/gasprices/blockprices?chainid=1&confidenceLevels=50,70,80,90,99'

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

OPTIONAL if used, must contain a valid apikey

{
    "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
                },
                ...,
            ]
        }
    ]
}

{
    "msg": "Optional authorization header must contain a valid apikey"
}

{ "msg":"Too Many Requests" }

Query Parameters

Name

Type

Description

confidenceLevels

integer

Override default confidence levels (99,95,90,80,70) in response with up to 5 confidence levels.

Ethereum Mainnet confidence levels are from 1 - 99 (increments of 1) Other chains confidence levels are any from (99,95,90,80,70,50)

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.

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