POST
/
efb0a5eccd2caa5135eb54eba6f7f300
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "eth_call",
  "id": 1,
  "params": [
    {
      "to": "0xC7846d1bc4d8bcF7c45a7c998b77cE9B3c904365",
      "data": "0x1526fe270000000000000000000000000000000000000000000000000000000000000001"
    },
    "latest"
  ]
}'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

The example is a call to the poolinfo of the Gamma MasterChef contract.

Optimism API method eth_call executes a smart contract function call directly and returns the result without requiring a transaction or changing the state on the blockchain. This method is widely used for reading data from smart contracts.

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​
Parameters

  • transactionObject — an object containing transaction parameters, including:
    • to — the address of the contract to call.
    • data — the call data, typically including the function signature and parameters.
  • blockParameter — a string specifying the block number (in hexadecimal) or one of the strings "earliest", "latest", or "pending", indicating the blockchain state to use for the call. Most commonly, "latest" is used.

​
Response

  • result — the result of the call, encoded as a hexadecimal string. The format of the result depends on the function called.

​
Use case

The eth_call method is essential for:

  • DApps that need to retrieve state or compute derived values from smart contracts without making a transaction.
  • Wallets and interfaces that display contract information, such as token balances or the state of a decentralized finance (DeFi) contract.
  • Automated scripts and bots that monitor contract states or conditions on the blockchain.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_call
​
id
integer
default:1
​
params
array

Response

200 - application/json
The result of the call
​
jsonrpc
string
​
id
integer
​
result
string