eth_chainId

Get chain ID on the Base network.

Parameters

Varies by method. Please refer to the official Ethereum JSON-RPC: eth_chainId documentation for detailed parameter information.

Returns

The return value depends on the specific method being called.

Implementation Example

cURL

curl -X POST https://api-base-mainnet-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_chainId",
    "params": [],
    "id": 1
  }'

JavaScript

const response = await fetch('https://api-base-mainnet-archive.n.dwellir.com/YOUR_API_KEY', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_chainId',
    params: [],
    id: 1
  })
});

const data = await response.json();
console.log(data.result);

Response Example

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x2105"
}

Note: Chain ID 8453 (0x2105 in hexadecimal) identifies the Base mainnet.

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