eth_estimateGasHTTP

Estimates the gas limit for a transaction simulation. It is not a guarantee of later success or a quote for the complete transaction fee; state, gas caps and network-specific charges can change.

Chain EthereumTransport HTTPTry-it live

How to use

Pick an API key (or paste one) in the Try it panel.
Object params use a tall JSON editor — click Fill example if available.
Send request — live against the gateway; counts toward daily quota.

Parameters

JSON-RPC positional arguments — order matches the array sent in params. Index badges below match array positions.

callObjectrequired

Transaction call object (JSON); use the intended sender and value for a useful estimate.

todestination; omit only for supported contract-creation simulations
inputhex call bytes; data is a supported alias, but do not send conflicting values
fromoptional simulated sender (affects msg.sender)
gasoptional execution gas ceiling as hex
valuenative-currency value in smallest units as hex
gasPricelegacy fee per gas; do not combine with dynamic-fee fields
maxFeePerGasdynamic-fee cap where supported
maxPriorityFeePerGasexecution tip cap where supported
accessListoptional addresses and storage keys to pre-warm where supported

blockQUANTITY|TAGoptional

Optional state selector; send latest explicitly for compatibility. Historical state and hash-based selectors depend on the selected network and upstream client.

params array (shape)

eth_estimateGas · paramsjson

1[
2  {
3    "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
4    "value": "0x1",
5    "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
6  }
7]

Try it

Live request via the gateway — counts toward your account's daily quota. Chain: ethereum

JSON mode

API key

Try-it runs with one of your own keys — sign in or create a free account first.

Parameters

0callObjectrequired

Transaction call object (JSON); use the intended sender and value for a useful estimate.

todestination; omit only for supported contract-creation simulations
inputhex call bytes; data is a supported alias, but do not send conflicting values
fromoptional simulated sender (affects msg.sender)
gasoptional execution gas ceiling as hex
valuenative-currency value in smallest units as hex
gasPricelegacy fee per gas; do not combine with dynamic-fee fields
maxFeePerGasdynamic-fee cap where supported
maxPriorityFeePerGasexecution tip cap where supported
accessListoptional addresses and storage keys to pre-warm where supported

Paste a JSON object. Indent freely — we parse it into the params array.

1blockQUANTITY|TAGoptional

Optional state selector; send latest explicitly for compatibility. Historical state and hash-based selectors depend on the selected network and upstream client.

Example request

eth_estimateGas · requestbash

1curl 'https://ethras.org/v1/ethereum/<YOUR_KEY>' \
2  -H 'Content-Type: application/json' \
3  -d '{
4    "id": 1,
5    "jsonrpc": "2.0",
6    "method": "eth_estimateGas",
7    "params": [
8      {
9        "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
10        "value": "0x1"
11      }
12    ]
13  }'

Example response

Illustrative example: long hex values and object fields may be shortened for readability. Available fields depend on the network, client, protocol upgrade and transaction type.

eth_estimateGas · responsejson

1{
2  "jsonrpc": "2.0",
3  "id": 1,
4  "result": "0x5208"
5}

Response fields

The result row describes the complete result; other rows describe its object fields or array elements. Indented rows describe nested members. For subscriptions,params.* rows describe later notifications rather than the initial reply.

Field	Type	Description
`result`	`QUANTITY`	Estimated gas units the transaction would consume.