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POST
eth_chainId
curl --request POST \
  --url https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_chainId",
  "params": [],
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt

Use this file to discover all available pages before exploring further.

Tempo API method that returns the chain ID of the current network. The Tempo mainnet chain ID is 4217 (0x1079 in hexadecimal). The Moderato testnet chain ID is 42431 (0xa5bf).
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​
Parameters

  • none

​
Response

  • result — the chain ID encoded as hexadecimal (0x1079 for Tempo mainnet / 0xa5bf for Moderato testnet)

​
eth_chainId code examples

const Web3 = require("web3");
const NODE_URL = "CHAINSTACK_NODE_URL";
const web3 = new Web3(NODE_URL);

async function getChainId() {
  const chainId = await web3.eth.getChainId();
  console.log(`Chain ID: ${chainId}`);
}

getChainId()

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_chainId
​
params
any[]
​
id
integer
default:1

Response

200 - application/json

The chain ID

​
jsonrpc
string
​
id
integer
​
result
string

The chain ID encoded as hexadecimal (0xa5bd for Tempo testnet)

Last modified on May 18, 2026