> ## Documentation Index > Fetch the complete documentation index at: https://docs.agg.market/llms.txt > Use this file to discover all available pages before exploring further. # Cancel an order > Deprecated: use POST /execution/orders/cancel with { orderId }. For Hyperliquid self-custody, cancelSignature carries venue, the single-order cancel action, a fresh millisecond nonce and its r/s/v signature from the EOA or approved client-held agg agent. For Polymarket, it carries a ClobAuth signature and timestamp. Cancels a queued managed order or an active open limit order. Terminal orders cannot be cancelled. A self-custody limit order that has already been submitted to the venue needs `cancelSignature` from its signing wallet; without it the call returns 409 and the order is unchanged. One whose submission has not started yet can be cancelled without a signature. A 200 response carrying `status: "cancel_pending"` for a self-custody order is not final: continue polling while AGG reconciles venue state. An order whose submission is already in progress also returns 409 — retry once it is open. ## OpenAPI ````yaml /openapi/openapi.json post /execution/orders/{orderId}/cancel openapi: 3.0.2 info: title: AGG API version: 1.0.0 description: >- Prediction market aggregator REST API — authentication, users, venue events, venue markets, orderbooks, charts, and execution workflows. servers: - url: https://api.agg.market description: Production - url: https://api.staging.agg.market description: Staging security: [] paths: /execution/orders/{orderId}/cancel: post: tags: - Execution summary: Cancel an order description: >- Deprecated: use POST /execution/orders/cancel with { orderId }. For Hyperliquid self-custody, cancelSignature carries venue, the single-order cancel action, a fresh millisecond nonce and its r/s/v signature from the EOA or approved client-held agg agent. For Polymarket, it carries a ClobAuth signature and timestamp. Cancels a queued managed order or an active open limit order. Terminal orders cannot be cancelled. A self-custody limit order that has already been submitted to the venue needs `cancelSignature` from its signing wallet; without it the call returns 409 and the order is unchanged. One whose submission has not started yet can be cancelled without a signature. A 200 response carrying `status: "cancel_pending"` for a self-custody order is not final: continue polling while AGG reconciles venue state. An order whose submission is already in progress also returns 409 — retry once it is open. operationId: cancelManagedOrder parameters: - name: orderId in: path required: true schema: type: string requestBody: required: true content: application/json: schema: type: object properties: cancelSignature: anyOf: - additionalProperties: false description: >- Self-custody Polymarket limit orders only; omit it for managed orders. An EIP-712 signature by the order's signing wallet (the `signingAddress` the order was placed with) over Polymarket's CLOB L1 auth message: domain `{ name: "ClobAuthDomain", version: "1", chainId: 137 }`, primary type `ClobAuth` with fields `address` (address), `timestamp` (string), `nonce` (uint256), `message` (string), where `address` is the signing wallet, `timestamp` is the `timestamp` below encoded as a decimal string, `nonce` is 0, and `message` is "This message attests that I control the given wallet". Ask the user to sign when they cancel. The signature is never persisted or logged. The CLOB credentials derived from it are used only for this request and are not stored. type: object required: - signature - timestamp properties: signature: pattern: ^0x[0-9a-fA-F]{130}$ description: A 65-byte hex signature (`0x` + 130 hex characters). type: string timestamp: minimum: 0 description: >- Unix seconds — the value that was signed. Use the current time. Rejected if more than 480 seconds in the future; Polymarket rejects one older than about two minutes. type: integer - additionalProperties: false description: >- Hyperliquid cancellation signed by the linked EOA or its currently approved agg agent. Sign the single-order cancel action using the Hyperliquid L1 action signer, with nonce Date.now(). The asset and order ID must match this order. Never send the private key. type: object required: - venue - action - nonce - signature properties: venue: type: string enum: - hyperliquid action: additionalProperties: false type: object required: - type - cancels properties: type: type: string enum: - cancel cancels: minItems: 1 maxItems: 1 type: array items: additionalProperties: false type: object required: - a - o properties: a: minimum: 0 maximum: 9007199254740991 type: integer o: minimum: 1 maximum: 9007199254740991 type: integer nonce: minimum: 1 maximum: 9007199254740991 type: integer signature: additionalProperties: false type: object required: - r - s - v properties: r: pattern: ^0x[0-9a-fA-F]{64}$ type: string s: pattern: ^0x[0-9a-fA-F]{64}$ type: string v: type: number enum: - 27 - 28 responses: '200': description: '200' content: application/json: schema: type: object required: - quoteId - orderIds - status properties: quoteId: type: string nullable: true orderIds: type: array items: type: string status: type: string enum: - cancelled - cancel_pending '401': description: '401' content: application/json: schema: type: object required: - message properties: message: type: string '403': description: '403' content: application/json: schema: type: object required: - message properties: message: type: string '404': description: '404' content: application/json: schema: type: object required: - message properties: message: type: string '409': description: '409' content: application/json: schema: type: object required: - message properties: message: type: string deprecated: true security: - appId: [] bearerAuth: [] components: securitySchemes: appId: type: apiKey in: header name: x-app-id description: Your application ID. Required for all app-tier and user-tier routes. bearerAuth: type: http scheme: bearer bearerFormat: JWT description: >- JWT access token returned by POST /auth/verify. Required for user-tier routes. ````