eth_estimateGas - Ethereum

Counts and presents the necessary gas amount for a successful transaction. This transaction will not appear on blockchain

How to Use the eth_estimateGas Method

Parameters

TRANSACTION CALL OBJECT [necessary]

• from: [variable] 20 Bytes - What address are you sending transactions from.

• to: 20 Bytes - Which address should receive your transaction.

• gas: [variable] How much gas do you need to proceed a transaction (as an integer). eth_estimateGas doesn’t require gas at all, but with some actions you will need this parameter.

• gasPrice: [variable] Present gasPrice for each gas you paid for as an integer.

• value: [variable How much ETH do you send by this transaction.

• data: [variable] Method signature and encoded parameters’ hash. Check Ethereum Contract ABI to see details.

What you receive

QUANTITY - how much gas did you use.

Sample

Here is a typical appliance example.

Call

Curl

curl https://eth-mainnet.rpcfast.com/?api_key=<key> \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'

Outcome

{ "id":1, "jsonrpc": "2.0", "result": "0x5208" // 21000 }