Oracles API

Retrieve a list of supported oracles by chain and their associated metadata.

The Blocknative Gas Oracles API provides metadata on supported chains, including their chain ID, label, architecture, RPC url, block explorer url and oracle addresses keyed by version. This allows developers to dynamically identify which networks have live supported gas estimation oracles.

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/oracles

Returns a list of supported gas oracles per chain along with their chain ID, label, architecture (e.g., evm), RPC url, block explorer url and oracle addresses keyed by version (e.g. "2":"0x1c51B22954af03FE11183aaDF43F6415907a9287"). This allows users to identify networks that have supported oracles where Blocknative provides onchain gas price estimation. The list and available fields are subject to change as new chains or parameters are added or updated.

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.

Example Request

curl -H 'Authorization: optional-apikey-here'
     'https://api.blocknative.com/oracle'

Headers

Name	Type	Description
Authorization	String	OPTIONAL if used, must contain a valid apikey

Response Codes

Code	Description
200	Success
401	API key invalid or not provided
429	Rate limit exceeded. Refer to headers for retry

Example Response

[
    {
        "chainId": 42161,
        "label": "Arbitrum One",
        "name": "arbitrum",
        "network": "mainnet",
        "addressByVersion": {
            "2": "0x1c51B22954af03FE11183aaDF43F6415907a9287"
        },
        "rpcUrl": "https://arbitrum.llamarpc.com",
        "blockExplorerUrl": "https://arbiscan.io/",
        "arch": "evm",
        "icon": "https://bnc-assets.com/evm/42161/assets/icon.svg",
        "testnet": false
    },
    {
        "chainId": 11155111,
        "label": "Ethereum Sepolia",
        "name": "ethereum-sepolia",
        "network": "mainnet",
        "addressByVersion": {
            "2": "0xCc936bE977BeDb5140C5584d8B6043C9068622A6",
            "1": "0xE4859432d9Af6D40C2D923e3F13D66057F4AEcA0"
        },
        "rpcUrl": "https://endpoints.omniatech.io/v1/eth/sepolia/public",
        "blockExplorerUrl": "https://sepolia.etherscan.io",
        "arch": "evm",
        "icon": "https://bnc-assets.com/evm/11155111/assets/icon.svg",
        "testnet": true
    },
    {
        "chainId": 10,
        "label": "Optimism",
        "name": "optimism",
        "network": "mainnet",
        "addressByVersion": {
            "2": "0x152bB09cE15f1149dBE46EB9E4D4e1B572513453"
        },
        "rpcUrl": "https://optimism.llamarpc.com",
        "blockExplorerUrl": "https://optimistic.etherscan.io/",
        "arch": "evm",
        "icon": "https://bnc-assets.com/evm/10/assets/icon.svg",
        "testnet": false
    },
    ...
]

Response Fields

Field	Type	Description
arch	String	The blockchain architecture (e.g., "evm").
chainId	Integer	The unique identifier for the blockchain (e.g., 1 for Ethereum).
label	String	The human-readable name of the blockchain (e.g., "Polygon zkEVM").
icon	String	URL to the blockchain's icon.
system	String	The human-readable name of the ecosystem, (e.g. "ethereum" or "bitcoin")
network	String	Internal name of the blockchain (e.g. "main" or "sepolia"). See chain table.
addressByVersion	Object<String, String>	An objects with the inner keys representing the contract version of the oracle and the value of given key being the gas oracle address (e.g. <oracleVersion> : <contractAddress> || "2": "0x152bB09cE15f1149dBE46EB9E4D4e1B572513453"
rpcUrl	String	A public RPC Url for the given chain (e.g. "https://optimism.llamarpc.com")
blockExplorerUrl	String	A public Block Explorer Url for the given chain (e.g. "https://optimistic.etherscan.io/")

Notes

• The list of supported blockchains and available features may change as new networks are integrated.