> ## Documentation Index
> Fetch the complete documentation index at: https://cosmos-docs-sync-security-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# check_tx

> Checks the transaction without executing it.

The transaction won't be added to the mempool.

Please refer to [formatting/encoding rules](https://docs.cosmos.network/cometbft/v0.38/docs/core/Using-CometBFT#formatting)
for additional details

Upon success, the `Cache-Control` header will be set with the default
maximum age.



## OpenAPI

````yaml /cometbft/latest/api-reference/rpc/openapi.yaml get /check_tx
openapi: 3.0.0
info:
  title: CometBFT RPC
  contact:
    name: CometBFT
    url: https://docs.cosmos.network/cometbft
  description: >
    CometBFT supports the following RPC protocols:


    * URI over HTTP

    * JSONRPC over HTTP

    * JSONRPC over websockets


    ## Configuration


    RPC can be configured by tuning parameters under `[rpc]` table in the

    `$CMTHOME/config/config.toml` file or by using the `--rpc.X` command-line

    flags.


    The default RPC listen address is `tcp://127.0.0.1:26657`.

    To set another address, set the `laddr` config parameter to desired value.

    CORS (Cross-Origin Resource Sharing) can be enabled by setting

    `cors_allowed_origins`, `cors_allowed_methods`, `cors_allowed_headers`

    config parameters.


    If testing using a local RPC node, under the `[rpc]`

    section change the `cors_allowed_origins` property, please add the URL of

    the site where this OpenAPI document is running, for example:

      `cors_allowed_origins = ["http://localhost:8088"]`

    or if testing from the official documentation site:

      `cors_allowed_origins = ["https://docs.cosmos.network"]`

    ## Arguments


    Arguments which expect strings or byte arrays may be passed as quoted

    strings, like `"abc"` or as `0x`-prefixed strings, like `0x616263`.


    ## URI/HTTP


    A REST like interface.

        curl localhost:26657/block?height=5

    ## JSONRPC/HTTP


    JSONRPC requests can be POST'd to the root RPC endpoint via HTTP.

        curl --header "Content-Type: application/json" --request POST --data '{"method": "block", "params": ["5"], "id": 1}' localhost:26657

    ## JSONRPC/websockets


    JSONRPC requests can be also made via websocket.

    The websocket endpoint is at `/websocket`, e.g. `localhost:26657/websocket`.

    Asynchronous RPC functions like event `subscribe` and `unsubscribe` are

    only available via websockets.


    For example using the [websocat](https://github.com/vi/websocat) tool, you
    can subscribe for 'NewBlock` events

    with the following command:

        echo '{ "jsonrpc": "2.0","method": "subscribe","id": 0,"params": {"query": "tm.event='"'NewBlock'"'"} }' | websocat -n -t ws://127.0.0.1:26657/websocket
  version: v0.38.x
  license:
    name: Apache 2.0
    url: https://github.com/cometbft/cometbft/blob/v0.38.x/LICENSE
servers:
  - url: https://rpc.cosmos.directory/cosmoshub
    description: Interact with the CometBFT RPC from a public node in the Cosmos registry
  - url: http://localhost:26657
    description: Interact with CometBFT RPC node running locally
security: []
tags:
  - name: Info
    description: Informations about the node APIs
  - name: Tx
    description: Transactions broadcast APIs
  - name: ABCI
    description: ABCI APIs
  - name: Evidence
    description: Evidence APIs
  - name: Unsafe
    description: Unsafe APIs
paths:
  /check_tx:
    get:
      tags:
        - Tx
      summary: check_tx
      description: >-
        Checks the transaction without executing it.


        The transaction won't be added to the mempool.


        Please refer to [formatting/encoding
        rules](https://docs.cosmos.network/cometbft/v0.38/docs/core/Using-CometBFT#formatting)

        for additional details


        Upon success, the `Cache-Control` header will be set with the default

        maximum age.
      operationId: check_tx
      parameters:
        - in: query
          name: tx
          required: true
          schema:
            type: string
            example: '785'
          description: The transaction
      responses:
        '200':
          description: ABCI application's CheckTx response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CheckTxResponse'
        '500':
          description: empty error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    CheckTxResponse:
      type: object
      required:
        - error
        - result
        - id
        - jsonrpc
      properties:
        error:
          type: string
          example: ''
        result:
          required:
            - log
            - data
            - code
          properties:
            code:
              type: string
              example: '0'
            data:
              type: string
              example: ''
            log:
              type: string
              example: ''
            info:
              type: string
              example: ''
            gas_wanted:
              type: string
              example: '1'
            gas_used:
              type: string
              example: '0'
            events:
              type: array
              nullable: true
              items:
                type: object
                properties:
                  type:
                    type: string
                    example: app
                  attributes:
                    type: array
                    nullable: false
                    items:
                      $ref: '#/components/schemas/Event'
            codespace:
              type: string
              example: bank
          type: object
        id:
          type: integer
          example: 0
        jsonrpc:
          type: string
          example: '2.0'
    ErrorResponse:
      description: Error Response
      allOf:
        - $ref: '#/components/schemas/JSONRPC'
        - type: object
          properties:
            error:
              type: string
              example: Description of failure
    Event:
      type: object
      properties:
        key:
          type: string
          example: action
        value:
          type: string
          example: send
        index:
          type: boolean
          example: false
    JSONRPC:
      type: object
      properties:
        id:
          type: integer
          example: 0
        jsonrpc:
          type: string
          example: '2.0'

````