Generates and returns an estimate of how much gas is necessary to allow the transaction to complete.

Reference: Here

Parameters: (see eth_call parameters)

from - [optional] String of the address the transaction is sent from.

to - String of the address the transaction is directed to.

gas - [optional] Integer of the gas provided for the transaction execution.

gasprice - [optional] Integer of the gasPrice used for each paid gas encoded as a hexadecimal.

value - [optional] Integer of the value sent with this transaction encoded as a hexadecimal.

data - [optional] String of the hash of the method signature and encoded parameters. For more information, see the Contract ABI description in the Solidity documentation.

If no gas limit is specified geth uses the block gas limit from the pending block as an upper bound. As a result the returned estimate might not be enough to executed the call/transaction when the amount of gas is higher than the pending block gas limit.


Returned Value:

String - hex string value representing an integer of the amount of gas units used.

  "jsonrpc": "2.0",
  "result": "0x5208" // 21000
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'

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