klay_estimategas

How to use it

// yarn add @tatumio/tatum

import { TatumSDK, Klaytn, Network } from '@tatumio/tatum'

const tatum = await TatumSDK.init<Klaytn>({ network: Network.KLAYTN })

const estimate = await tatum.rpc.estimateGas({
  from: '0x3E18a8c3348447E3e69c847FbAA07117E2f46a1b',
  to: '0x3E18a8c3348447E3e69c847FbAA07117E2f46a1b',
  value: '0xde0b6b3a7640000',
  data: '0x606060',
})

await tatum.destroy() // Destroy Tatum SDK - needed for stopping background jobs

Overview

klay_estimateGas is an JSON-RPC method that estimates the amount of gas required to execute a given transaction. This method can be used to determine the gas cost before sending a transaction, allowing developers to better predict the gas fees and avoid issues like out-of-gas errors.

Use cases for klay_estimateGas include:

• Estimating gas costs for contract deployments
• Estimating gas costs for contract function calls
• Estimating gas costs for standard transfers

Parameters

The klay_estimateGas method takes a single parameter, an object representing the transaction details. The fields in the transaction object include:

• from (optional, string): The address that the transaction is sent from.
  • Example: "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
• to (optional, string): The address the transaction is sent to.
  • Example: "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
• gas (optional, string): The maximum amount of gas provided for the transaction.
  • Example: "gas": "0x76c0"
• gasPrice (optional, string): The price of gas in wei.
  • Example: "gasPrice": "0x9184e72a000"
• value (optional, string): The amount of ZEN to send in the transaction, in wei.
  • Example: "value": "0xde0b6b3a7640000"
• data (optional, string): The data payload of the transaction, typically used for contract function calls or contract deployment.
  • Example: "data": "0x606060..."
• nonce (optional, string): The transaction count of the from address.
  • Example: "nonce": "0x1"

Return Object

The return value of the klay_estimateGas method is a single field:

• gasEstimate (string): The estimated gas cost for the transaction, represented as a hexadecimal string.
  • Example: "0x5208"

JSON-RPC Request and Response Examples

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "klay_estimateGas",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "value": "0xde0b6b3a7640000",
      "data": "0x606060..."
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5208"
}