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

<AgentInstructions>

## Submitting Feedback

If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:

POST https://developers.fireblocks.com/feedback

```json
{
  "path": "/api-reference/transactions/cancel-a-transaction",
  "feedback": "Description of the issue"
}
```

Only submit feedback when you have something specific and actionable to report.

</AgentInstructions>

# Cancel a transaction

> Cancels a transaction by Fireblocks Transaction ID.

Can be used only for transactions that did not get to the BROADCASTING state.
Endpoint Permission: Admin, Non-Signing Admin, Signer, Approver, Editor.



## OpenAPI

````yaml https://docs.fireblocks.com/api/v1/swagger.yaml post /transactions/{txId}/cancel
openapi: 3.0.0
info:
  title: Fireblocks API
  description: >
    Fireblocks provides a suite of applications to manage digital asset
    operations and a complete development platform to build your business on the
    blockchain.


    - Visit our website for more information: [Fireblocks
    Website](https://fireblocks.com)

    - Visit our developer docs: [Fireblocks
    DevPortal](https://developers.fireblocks.com)
  version: 1.6.2
  contact:
    email: developers@fireblocks.com
servers:
  - url: https://api.fireblocks.io/v1
    description: Fireblocks Production Environment Base URL
  - url: https://sandbox-api.fireblocks.io/v1
    description: Fireblocks Sandbox Environment Base URL
security: []
paths:
  /transactions/{txId}/cancel:
    post:
      tags:
        - Transactions
      summary: Cancel a transaction
      description: >-
        Cancels a transaction by Fireblocks Transaction ID.


        Can be used only for transactions that did not get to the BROADCASTING
        state.

        Endpoint Permission: Admin, Non-Signing Admin, Signer, Approver, Editor.
      operationId: cancelTransaction
      parameters:
        - in: path
          name: txId
          required: true
          description: The ID of the transaction to cancel
          schema:
            type: string
        - $ref: '#/components/parameters/X-End-User-Wallet-Id'
        - $ref: '#/components/parameters/X-Idempotency-Key'
      responses:
        '200':
          description: An Transaction object
          headers:
            X-Request-ID:
              $ref: '#/components/headers/X-Request-ID'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CancelTransactionResponse'
        default:
          $ref: '#/components/responses/Error'
      x-codeSamples:
        - lang: TypeScript
          source: >-
            const response:
            Promise<FireblocksResponse<CancelTransactionResponse>> =
            fireblocks.transactions.cancelTransaction(transactionsApiCancelTransactionRequest);
        - lang: Java
          source: >-
            CompletableFuture<ApiResponse<CancelTransactionResponse>> response =
            fireblocks.transactions().cancelTransaction(txId, xEndUserWalletId,
            idempotencyKey);
        - lang: Python
          source: >-
            response = fireblocks.transactions.cancel_transaction(tx_id,
            x_end_user_wallet_id, idempotency_key);
components:
  parameters:
    X-End-User-Wallet-Id:
      name: X-End-User-Wallet-Id
      in: header
      description: >-
        Unique ID of the End-User wallet to the API request. Required for
        end-user wallet operations.
      required: false
      schema:
        type: string
        format: uuid
    X-Idempotency-Key:
      name: Idempotency-Key
      in: header
      description: >-
        A unique identifier for the request. If the request is sent multiple
        times with the same idempotency key, the server will return the same
        response as the first request. The idempotency key is valid for 24
        hours.
      required: false
      schema:
        type: string
  headers:
    X-Request-ID:
      schema:
        type: string
      description: >-
        Unique ID correlated to the API request. Please provide it in any
        support ticket you create or on Github issues related to Fireblocks SDKs
  schemas:
    CancelTransactionResponse:
      type: object
      properties:
        success:
          type: boolean
    ErrorSchema:
      type: object
      properties:
        message:
          type: string
        code:
          type: number
  responses:
    Error:
      description: Error Response
      headers:
        X-Request-ID:
          $ref: '#/components/headers/X-Request-ID'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorSchema'

````