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eth_chainId

Returns the currently configured chain ID, a value used in replay-protected transaction signing as introduced by EIP-155.

For Growth and Custom service plans

This JSON-RPC method allows a request to be forwarded to a partner service provider if Infura should experience a service issue or outage. See Failover protection and Enable API request forwarding for complete details.

If you would like failover protection but don't qualify under your current plan, then either self-upgrade to the Growth plan or contact a sales representative to upgrade to a Custom plan.

Parameters​

None.

Returns​

A hexadecimal of the current chain ID.

Example​

Replace YOUR-API-KEY with an API key from your Infura dashboard.

Request​

curl https://polygon-mainnet.infura.io/v3/YOUR-API-KEY \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_chainId","params": [],"id":1}'

Response​

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1"
}
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