> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uniblock.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# starknet_estimateMessageFee

> Estimates the resources required by the l1_handler transaction induced by the message.

### Parameters

<ParamField query="chainId" type="string" default="starknet-sepolia" required>
  Unique identifier for a blockchain network.
</ParamField>

<ParamField body="id" type="number" default={1} required>
  Request identifier used to match responses.
</ParamField>

<ParamField body="jsonrpc" type="string" default="2.0" required>
  JSON-RPC version.
</ParamField>

<ParamField body="method" type="string" default="starknet_estimateMessageFee" required>
  JSON-RPC method name.
</ParamField>

<ParamField body="params" type="object" default={[{},{}]} placeholder="[{},{}]">
  Parameters for starknet\_estimateMessageFee

  Positional parameters for <code>starknet\_estimateMessageFee</code>:

  <ul>
    <li><code>params\[0]</code>: Message from L1 object</li>
    <li><code>params\[1]</code>: Block identifier object</li>
  </ul>
</ParamField>

### Returns

<ResponseField name="result" type="object">
  Estimated fee for processing the l1\_handler transaction

  <Expandable title="properties">
    <ResponseField name="gas_consumed" type="string">
      Ethereum gas consumed by the transaction
    </ResponseField>

    <ResponseField name="gas_price" type="string">
      Gas price used in estimation (wei or fri)
    </ResponseField>

    <ResponseField name="data_gas_consumed" type="string">
      Ethereum data gas consumed by the transaction
    </ResponseField>

    <ResponseField name="data_gas_price" type="string">
      Data gas price used in estimation (wei or fri)
    </ResponseField>

    <ResponseField name="overall_fee" type="string">
      Estimated total fee = gas + data gas cost
    </ResponseField>

    <ResponseField name="unit" type="string">
      Fee units (wei or fri)
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```bash Curl theme={null}
  curl --request POST \
    --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=starknet-sepolia \
    --header 'content-type: application/json' \
    --data '{
      "id": 1,
      "jsonrpc": "2.0",
      "method": "starknet_estimateMessageFee",
      "params": [
        {},
        {}
      ]
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json Success theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
      {
        "from_address": "FROM_ADDRESS",
        "to_address": "TO_ADDRESS",
        "entry_point_selector": "ENTRY_POINT_SELECTOR",
        "payload": []
      },
      "latest"
    ]
  }
  ```
</ResponseExample>