🟪 Polygon
eth_chainId

Polygon API Documentation


eth_chainId JSON-RPC method

eth_chainId is used to retrieve the current chain ID. The chain ID is a unique identifier for each Blockchain network that is used to differentiate between them.

💡

Polygon network chain ID is 137

This method can be used to verify that your node is connected to the correct Blockchain network. Each Blockchain network has a unique chain ID, so you can compare the returned value to the known chain ID of the network you want to connect to.

Returns

Chain id - Hexadecimal value in string format which represents an integer of the chain ID

Parameters

None.

Request

POST https://<network>.chainnodes.org/YOUR-API-KEY

Example

  • HTTPS POST Request with a JSON RPC call in the body
  • Replace YOUR-API-KEY with the API key from your CHAINNODES.ORG Dashboard
  • You can use a different supported network by replacing polygon-mainnet
curl https://polygon-mainnet.chainnodes.org/YOUR-API-KEY \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

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Body

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

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JSON-RPC API Documentation by CHAINNODES is based on Erigon node client. Contact us if you are interested in specific methods that are only available on geth, besu, Nethermind or reth

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