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eth_chainId

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eth_chainId returns the chain ID used for replay-protected transaction signing as introduced in EIP-155. The value is encoded as a hexadecimal string; for Ethereum mainnet this is 0x1 (decimal 1).

Use this method to confirm which network your RPC connection is pointed at before submitting transactions, and to derive the chain ID that must be included when signing EIP-155 transactions. It is the recommended way to detect the active network — prefer it over net_version, which returns the network ID as a decimal string and is not guaranteed to equal the chain ID.

This method takes no parameters and is available on every tier.

Parameters

This method takes no parameters.

Returns

eth_chainId return value
FieldType
resultobject

Examples

curl https://triport.io/eth \
  -X POST -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <api-key>' \
  -d '{"id":1,"method":"eth_chainId","params":[],"jsonrpc":"2.0"}'
const res = await fetch("https://triport.io/eth", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer <api-key>" },
  body: JSON.stringify({
  "id": 1,
  "method": "eth_chainId",
  "params": [],
  "jsonrpc": "2.0"
}),
});
const data = await res.json();
import requests
resp = requests.post(
    "https://triport.io/eth",
    headers={"Authorization": "Bearer <api-key>"},
    json={"id":1,"method":"eth_chainId","params":[],"jsonrpc":"2.0"},
)
print(resp.json())
{
  "id": 1,
  "result": "0x1",
  "jsonrpc": "2.0"
}

Usage

  1. Transport: HTTP (JSON-RPC).
  2. Networks: mainnet.
  3. Credit cost: 1 per call.

FAQ

What does eth_chainId do?
Returns the EIP-155 chain ID of the network the node is connected to, as a hex string.
How many credits does eth_chainId cost?
eth_chainId costs 1 credit(s) per call on Triport by default.
Is eth_chainId available over WebSocket?
eth_chainId is an HTTP JSON-RPC method.