eth_estimateGas - Celo

Example code for the eth_estimateGas JSON-RPC method. Complete guide on how to use eth_estimateGas JSON-RPC in GetBlock Web3 documentation.

This method generates an estimate of how much gas is necessary to complete a transaction on the Celo network. This is essential for setting appropriate gas limits. Celo's low gas costs make accurate estimation important for optimal fee management.

Use eth_estimateGas to calculate gas requirements before sending transactions to avoid out-of-gas errors and set appropriate gas limits.

Parameters

Parameter	Type	Required	Description
transaction	object	Yes	Transaction call object
blockNumber	string	No	Block number in hex, or "latest" (default)

Request Example

cURL

cURL

curl -X POST https://go.getblock.io/<ACCESS-TOKEN>/ \
-H "Content-Type: application/json" \
-d '{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45",
      "to": "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199",
      "value": "0xde0b6b3a7640000"
    }
  ]
}'

JavaScript (Axios)

Python

Response Example

response.json

{
  "jsonrpc": "2.0",
  "id": "getblock.io",
  "result": "0x5208"
}

Response Definition

Field	Type	Description
result	string	Estimated gas amount in hexadecimal

Use Cases

• Calculate transaction costs before sending

• Set appropriate gas limits

• Budget gas for complex contract interactions

• Optimize transaction parameters

• Prevent out-of-gas errors

Error Handling

Error Code	Description
-32602	Invalid params - malformed transaction object
-32603	Internal error - execution reverted
-32000	Execution error - insufficient funds or revert

SDK Integration

Ethers.js

ethers-estimate.js

const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const gasEstimate = await provider.estimateGas({
  from: '0x742d35Cc6634C0532925a3b844Bc9e7595f8bB45',
  to: '0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199',
  value: ethers.parseEther('1.0')
});
console.log(gasEstimate.toString());

ContractKit