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

# starknet_simulateTransactions | Starknet

> Starknet API method that simulates the execution of a list of transactions on a given state. Available 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 simulates the execution of a list of transactions on a given state.

It provides a simulation of the execution of a list of transactions based on the network's current state and the transactions' parameters. A client or wallet can use this simulation to understand the potential outcome of these transactions if they were to be included in a block.

## Parameters

* `request` — the list of transactions to simulate.
* `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 result of the simulation, represented as a list of transaction receipts.

## Use case

A practical use case for `starknet_simulateTransactions` is to simulate the execution of a list of transactions that interact with contracts on StarkNet. This can be useful for testing and debugging purposes, as it allows developers to understand the potential outcome of these transactions without actually executing them on the network.

## 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={"system"}
curl --request POST \
     --url 'https://alpha-mainnet.starknet.io/feeder_gateway/simulate_transaction?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_simulateTransactions.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_simulateTransactions
      description: starknet_simulateTransactions
      operationId: starknetSimulateTransactions
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                id:
                  type: integer
                  default: 0
                jsonrpc:
                  type: string
                  default: '2.0'
                method:
                  type: string
                  default: starknet_simulateTransactions
                params:
                  type: array
                  items:
                    anyOf:
                      - type: object
                        properties:
                          block_number:
                            type: integer
                      - type: array
                        items:
                          type: object
                          properties:
                            type:
                              type: string
                            max_fee:
                              $ref: '#/components/schemas/FELT'
                            version:
                              type: string
                            signature:
                              type: array
                              items:
                                $ref: '#/components/schemas/FELT'
                            sender_address:
                              type: string
                            calldata:
                              type: array
                              items:
                                $ref: '#/components/schemas/FELT'
                            nonce:
                              $ref: '#/components/schemas/FELT'
                      - type: array
                        items:
                          type: string
              default:
                id: 0
                jsonrpc: '2.0'
                method: starknet_simulateTransactions
                params:
                  - block_number: 385940
                  - - type: INVOKE
                      max_fee: '0xb3a2f1ab6d632'
                      version: '0x1'
                      signature:
                        - >-
                          0x54c2201c7b9021777389e208e28eafc67e4ba1f1aa7016a1123b61c6ff79c29
                        - >-
                          0x58c2d97614e5abfd9668b314f344c945d16ea154cb32a7b08b4445204f1f1d3
                      sender_address: >-
                        0x0569b13e8164bc8000c0bbcf4887856516643af123c5bc3b01e229e92f9cfd10
                      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'
                      nonce: '0x51'
                  - - SKIP_VALIDATE
                    - SKIP_FEE_CHARGE
      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})$

````