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# starknet_estimateMessageFee | Starknet

> Starknet API method that returns an estimate of the fee for a given message. starknet_estimateMessageFee on Starknet via Chainstack.

<Note>
  **Starknet OpenRPC spec**

  For the latest version of the publicly maintained OpenRPC spec, see the [Starknet specs GitHub repo](https://github.com/starkware-libs/starknet-specs).
</Note>

Starknet API method that returns an estimate of the fee for a given message.

It provides an estimate of the maximum amount of fee required to process the message based on the network's current state and the message's parameters. A client or wallet can use this estimate to determine the appropriate amount of fee to include in a message to ensure that the network processes it.

## Parameters

* `message` — the message to estimate, which includes the following fields:
  * `to` — the string of the address to which the message is directed, a wallet, or a smart contract.
  * `data` — additional data to be sent with the message, usually used to invoke functions from smart contracts as a string of the hash of the method signature and encoded parameters.
* `block_id` — the hash of the requested block, or number (height) of the requested block, or a block tag, for the block referencing the state or call the transaction on.

## Response

* `result` — the estimated amount of fee needed, represented as a hexadecimal string.

## Use case

A practical use case for `starknet_estimateMessageFee` is to calculate the fee required for a message that interacts with a contract on Starknet. The fee is an important factor in messages, as it determines the amount of fees that need to be paid by the sender to the network for processing the message.

## Deprecated feeder gateway method

The feeder gateway was deprecated on [December 11, 2023](https://community.starknet.io/t/feeder-gateway-deprecation/100233).

Example of the call you had to make to the feeder gateway before the deprecation:

```Text Shell theme={null}
curl --request POST \
     --url 'https://alpha-mainnet.starknet.io/feeder_gateway/estimate_fee?blockNumber=385940' \
     --header 'Content-Type: application/json' \
     --data-raw '{
         "type": "INVOKE_FUNCTION",
         "sender_address": "0x0569b13e8164bc8000c0bbcf4887856516643af123c5bc3b01e229e92f9cfd10",
         "nonce": "0x51",
         "max_fee": "0xb3a2f1ab6d632",
         "version": "0x1",
         "calldata": [
            "0x3",
            "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
            "0x219209e083275171774dab1df80982e9df2096516f06319c5c6d71ae0a8480c",
            "0x3",
            "0xfff107e2403123c7df78d91728a7ee5cfd557aec0fa2d2bdc5891c286bbfff",
            "0x984e103a8acd6",
            "0x0",
            "0x68f5c6a61780768455de69077e07e89787839bf8166decfbf92b645209c0fb8",
            "0x219209e083275171774dab1df80982e9df2096516f06319c5c6d71ae0a8480c",
            "0x3",
            "0xfff107e2403123c7df78d91728a7ee5cfd557aec0fa2d2bdc5891c286bbfff",
            "0x4c4b40",
            "0x0",
            "0xfff107e2403123c7df78d91728a7ee5cfd557aec0fa2d2bdc5891c286bbfff",
            "0x2f0b3c5710379609eb5495f1ecd348cb28167711b73609fe565a72734550354",
            "0xe",
            "0x569b13e8164bc8000c0bbcf4887856516643af123c5bc3b01e229e92f9cfd10",
            "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
            "0x68f5c6a61780768455de69077e07e89787839bf8166decfbf92b645209c0fb8",
            "0x1f4",
            "0xa76cc",
            "0xa7b5e",
            "0x984e103a8acd6",
            "0x0",
            "0x4c4b40",
            "0x0",
            "0x9542431aa6bf1",
            "0x0",
            "0x4ac4a0",
            "0x0"
         ],
         "signature": ["0x54c2201c7b9021777389e208e28eafc67e4ba1f1aa7016a1123b61c6ff79c29", "0x58c2d97614e5abfd9668b314f344c945d16ea154cb32a7b08b4445204f1f1d3"]
     }'
```


## OpenAPI

````yaml openapi/starknet_node_api/starknet_estimateMessageFee.json POST /365cf697a3ad6d950b4c4a911e2e4f4d
openapi: 3.0.0
info:
  title: starknet
  version: 1.0.0
  contact: {}
servers:
  - url: https://starknet-mainnet.core.chainstack.com
security: []
paths:
  /365cf697a3ad6d950b4c4a911e2e4f4d:
    post:
      summary: starknet_estimateMessageFee
      description: starknet_estimateMessageFee
      operationId: starknetEstimateMessageFee
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                id:
                  type: integer
                jsonrpc:
                  type: string
                method:
                  type: string
                params:
                  type: array
                  items:
                    anyOf:
                      - type: object
                        properties:
                          from_address:
                            type: string
                          to_address:
                            type: string
                          entry_point_selector:
                            type: string
                          payload:
                            type: array
                            items:
                              $ref: '#/components/schemas/FELT'
                      - type: object
                        properties:
                          block_number:
                            type: integer
              default:
                id: 0
                jsonrpc: '2.0'
                method: starknet_estimateMessageFee
                params:
                  - from_address: '0xae0ee0a63a2ce6baeeffe56e7714fb4efe48d419'
                    to_address: >-
                      0x073314940630fd6dcda0d772d4c972c4e0a9946bef9dabf4ef84eda8ef542b82
                    entry_point_selector: >-
                      0x02d757788a8d8d6f21d1cd40bce38a8222d70654214e96ff95d8086e684fbee5
                    payload:
                      - >-
                        0x1cf4ca56a4841f8a7d39d22d5369434f74e480b370be7bc5a814384b758e604
                      - '0x6a94d74f430000'
                      - '0x0'
                  - block_number: 387702
      responses:
        '200':
          description: Successful response
components:
  schemas:
    FELT:
      type: string
      title: Field element
      description: A field element. represented by at most 63 hex digits
      pattern: ^0x(0|[a-fA-F1-9]{1}[a-fA-F0-9]{0,62})$

````