> ## 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.

# twapCancel | Hyperliquid exchange

> Cancels an active TWAP order by its ID. twapCancel JSON-RPC method available on the Hyperliquid exchange blockchain via Chainstack.

<Info>
  You can only use this endpoint on the official Hyperliquid public API. It is not available through Chainstack, as the open-source node implementation does not support it yet. See [Hyperliquid methods](/docs/hyperliquid-methods) for the full availability breakdown.
</Info>

<Note>
  This endpoint requires signature authentication. See our comprehensive [Authentication via Signatures guide](/docs/hyperliquid-authentication-guide) for implementation details.
</Note>

Cancels an active TWAP order by its ID.

## Parameters

### Required parameters

* `action` (object, required) — The action object containing:
  * `type` (string) — Must be `"twapCancel"`
  * `a` (integer) — Asset index
  * `t` (integer) — TWAP order ID to cancel
* `nonce` (number, required) — Current timestamp in milliseconds (must be recent)
* `signature` (object, required) — EIP-712 signature of the action

### Optional parameters

* `vaultAddress` (string, optional) — Address when trading on behalf of a vault or subaccount

## Returns

Returns an object with the action status:

* `status` — `"ok"` if request processed
* `response` — Contains action result data

## Example request

<CodeGroup>
  ```shell cURL theme={"system"}
  curl -X POST https://api.hyperliquid.xyz/exchange \
    -H "Content-Type: application/json" \
    -d '{
      "action": {"type": "twapCancel"},
      "nonce": 1234567890123,
      "signature": {...}
    }'
  ```

  ```typescript TypeScript (@nktkas/hyperliquid) theme={"system"}
  import * as hl from "@nktkas/hyperliquid";
  import { privateKeyToAccount } from "viem/accounts";

  // Public Hyperliquid mainnet endpoint (default transport)
  const wallet = privateKeyToAccount("0x..."); // viem or ethers account
  const transport = new hl.HttpTransport();
  const client = new hl.ExchangeClient({ transport, wallet });

  // Cancel an active TWAP order by asset ID (a) and TWAP order ID (t)
  const result = await client.twapCancel({
    a: 0, // asset index
    t: 1, // TWAP order ID to cancel
  });

  console.log(result);
  ```

  ```python Python (hyperliquid-python-sdk) theme={"system"}
  # Note: the official hyperliquid-python-sdk does not expose a twapCancel
  # helper yet, so build and post the signed action directly.
  from hyperliquid.exchange import Exchange
  from hyperliquid.utils import constants
  from hyperliquid.utils.signing import sign_l1_action, get_timestamp_ms
  import eth_account

  # Public Hyperliquid mainnet endpoint
  wallet = eth_account.Account.from_key("0x...")  # your private key
  exchange = Exchange(wallet, constants.MAINNET_API_URL)

  timestamp = get_timestamp_ms()
  action = {
      "type": "twapCancel",
      "a": 0,  # asset index
      "t": 1,  # TWAP order ID to cancel
  }
  signature = sign_l1_action(
      wallet,
      action,
      None,  # vault_address
      timestamp,
      None,  # expires_after
      exchange.base_url == constants.MAINNET_API_URL,
  )
  result = exchange._post_action(action, signature, timestamp)
  print(result)
  ```
</CodeGroup>

## Use case

* **TWAP cancel** — Cancels an active TWAP order by its ID.

<Warning>
  Always ensure your system clock is synchronized. Nonce must be within a reasonable time window of the current server time or the request will be rejected.
</Warning>


## OpenAPI

````yaml openapi/hyperliquid_node_api/hypercore_exchange/exchange_twap_cancel.json post /exchange
openapi: 3.0.0
info:
  title: Hyperliquid Exchange API
  version: 1.0.0
  description: >-
    API for trading operations on Hyperliquid exchange. **IMPORTANT**: All
    exchange endpoints require EIP-712 signatures for authentication. The
    examples shown will not work without proper signing. See the [Hyperliquid
    Python SDK](https://github.com/hyperliquid-dex/hyperliquid-python-sdk) for
    implementation examples.
servers:
  - url: https://api.hyperliquid.xyz
security: []
paths:
  /exchange:
    post:
      tags:
        - hyperliquid exchange
      summary: TWAP cancel
      operationId: twapCancel
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                action:
                  type: object
                  properties:
                    type:
                      type: string
                      default: twapCancel
                      enum:
                        - twapCancel
                      description: Action type for twap cancel
                    a:
                      type: integer
                      description: Asset index
                      example: 0
                    t:
                      type: integer
                      description: TWAP order ID to cancel
                      example: 12345
                  required:
                    - type
                nonce:
                  type: integer
                  description: Current timestamp in milliseconds
                signature:
                  type: object
                  description: EIP-712 signature of the action with r, s, v components
                  properties:
                    r:
                      type: string
                      description: ECDSA signature r component (hex string)
                      example: >-
                        0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef
                    s:
                      type: string
                      description: ECDSA signature s component (hex string)
                      example: >-
                        0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321
                    v:
                      type: integer
                      description: ECDSA recovery id (27 or 28)
                      example: 27
                  required:
                    - r
                    - s
                    - v
                vaultAddress:
                  type: string
                  description: >-
                    Address when trading on behalf of a vault or subaccount
                    (optional)
                  nullable: true
              required:
                - action
                - nonce
                - signature
            example:
              action:
                type: twapCancel
                a: 0
                t: 12345
              nonce: 1705234567890
              signature:
                r: >-
                  0x0000000000000000000000000000000000000000000000000000000000000000
                s: >-
                  0x0000000000000000000000000000000000000000000000000000000000000000
                v: 27
              vaultAddress: null
      responses:
        '200':
          description: Action result
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: string
                    description: Request status
                  response:
                    type: object
                    description: Action response data

````