eth_estimateGas - Optimism

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain.

📘

Note

The estimate may be significantly more than the amount of gas actually used by the transaction, for a variety of reasons including EVM mechanics and node performance. Estimates are served directly from nodes, we're not doing anything special to the value so the rest of the network is likely seeing the same.

Parameters

  • Object - The transaction call object
    • from: DATA, 20 Bytes - (optional) The address the transaction is sent from.
    • to: DATA, 20 Bytes - The address the transaction is directed to.
    • gas: QUANTITY - (optional) Integer of the gas provided for the transaction execution. eth_call consumes zero gas, but this parameter may be needed by some executions. NOTE: this parameter has a cap of 550 million Gwei per request. Reach out to us at support@alchemy.com if you want to increase this limit.
    • gasPrice: QUANTITY - (optional) Integer of the gasPrice used for each paid gas. Note: most of our users (95%+) never set the gasPrice on eth_call.
    • value: QUANTITY - (optional) Integer of the value sent with this transaction
    • data: DATA - (optional) Hash of the method signature and encoded parameters. For details see Ethereum Contract ABI
  • QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

🚧

Note

  • eth_estimateGas will check the sender's balance (to ensure that the sender has enough gas to complete the request). This means that even though the call doesn't consume any gas, the from address must have enough gas to execute the transaction.
  • If no gas 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 execute the call/transaction when the amount of actual gas needed is higher than the pending block gas limit.

Returns

QUANTITY - the amount of gas used.

Request

curl https://opt-mainnet.g.alchemy.com/v2/your-api-key \ -X POST \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'
URL: https://opt-mainnet.g.alchemy.com/v2/your-api-key RequestType: POST Body: { "jsonrpc":"2.0", "method":"eth_estimateGas", "params":[{see above}], "id":1 }

Result

{ "id":1, "jsonrpc": "2.0", "result": "0x5208" // 21000 }
Path Params
string
required
Defaults to docs-demo

For higher throughput, create your own API key

Body Params
integer
Defaults to 1
string
Defaults to 2.0
string
Defaults to eth_estimateGas
array
params
Response

Response body
object
integer
string
string
Language
URL
Request
Choose an example:
application/json
ReadMe
Support Hub