Chains API

Access supported blockchain networks and contract information.

List Chains

GET /api/chains

Returns all supported blockchain networks.

Query Parameters

Response

{
  "data": [
    {
      "id": "chain_1",
      "chainId": 1,
      "name": "Ethereum Mainnet",
      "symbol": "ETH",
      "chainType": "evm",
      "defaultPrimaryRpc": "https://...",
      "defaultFallbackRpc": "https://...",
      "explorerUrl": "https://etherscan.io",
      "explorerApiUrl": "https://api.etherscan.io",
      "isTestnet": false,
      "isEnabled": true
    },
    {
      "id": "chain_2",
      "chainId": 11155111,
      "name": "Sepolia",
      "symbol": "ETH",
      "chainType": "evm",
      "isTestnet": true,
      "isEnabled": true
    }
  ]
}

Chain Types

Chain Identifiers

KeeperHub action and execute endpoints accept either of two equivalent fields for selecting the target chain:

• chainId (canonical): the numeric chain ID. Send a number or a stringified number. Examples: 1, 8453, 11155111.
• network (deprecated alias): same field, retained for backward compatibility. In addition to numeric chain IDs, it resolves the common chain names below.

Prefer chainId in new clients. Both fields produce identical behavior; passing both is treated as chainId winning.

Accepted Chain Names

These string aliases are normalized to the numeric chain ID before routing. Names are case-insensitive.

Numeric chain IDs (as number or string) are accepted on every chain, including any chain present in GET /api/chains that does not appear in the alias table above.

Fetch Contract ABI

GET /api/chains/{chainId}/abi?address={contractAddress}

Fetches the ABI for a verified contract from the block explorer. The {chainId} path parameter is the numeric chain ID (e.g., 1, 8453, 11155111), not a chain name and not the internal id field from GET /api/chains.

Query Parameters

Response

{
  "abi": [
    {
      "type": "function",
      "name": "balanceOf",
      "inputs": [{"name": "account", "type": "address"}],
      "outputs": [{"name": "", "type": "uint256"}]
    }
  ]
}

Alternative ABI Fetch

GET /api/web3/fetch-abi?address={address}&chainId={chainId}

Alternative endpoint for fetching contract ABIs.