> ## Documentation Index > Fetch the complete documentation index at: https://docs.limitless.exchange/llms.txt > Use this file to discover all available pages before exploring further. # Batch Cancel Orders (Combined) > Cancel open orders by either internal orderIds or client-provided clientOrderIds. Cancel multiple orders by either internal `orderIds` or `clientOrderIds` supplied when creating the orders. Provide exactly one non-empty identifier array. Each request accepts 1–50 internal UUIDv4 IDs or 1–50 client order IDs of at most 128 characters. Requests with both arrays or neither array return `400 Bad Request`. `POST /orders/cancel-batch` remains supported for existing integrations and accepts `orderIds` only. ## Authentication and delegation Use a scoped API token with HMAC signing and the `trading` scope. To cancel for a partner sub-account, add `?onBehalfOf=`; the target must belong to the authenticated partner and the token must also have `delegated_signing`. Include the query string in the HMAC-signed path. ## Results * `200 OK` means every resolved order was cancelled. * `207 Multi-Status` means at least one order was cancelled and at least one failed. * `400 Bad Request` with a `failed` array means no order could be cancelled. * Internal-ID results use order-ID strings in `canceled` and `{ orderId, reason, message }` records in `failed`. * Client-ID results use `{ clientOrderId, orderId }` records in `canceled`. Failures are keyed by `clientOrderId`; `orderId` is included only if the client ID resolved before cancellation failed. For an internal-ID request, unknown IDs are omitted when at least one supplied ID resolves. If none resolve, the endpoint returns `404 Orders not found`. Client-ID requests report every unresolved client ID as `ORDER_NOT_FOUND`. Cancellation failures use `ORDER_NOT_FOUND` with `Order not found or already canceled`, or `UNKNOWN_ERROR` with `Failed to cancel order`. Cancellation remains available in `normal`, `post_only`, and `cancel_only`. Trading mode `disabled` returns `425 Too Early`. ## OpenAPI ````yaml POST /orders/batch-cancel openapi: 3.0.0 info: title: Limitless Exchange API description: >- # Limitless Exchange Trading API *Production-ready API for prediction market trading, portfolio management, and market data* > 🎯 **Quick Navigation**: [Authentication](#tag/authentication) | [Markets](#tag/markets) | [Trading](#tag/trading) | [Portfolio](#tag/portfolio) --- ## 🚀 Quick Start Choose your preferred programming language for complete end-to-end implementation: ### Overview The Limitless Exchange API offers both REST and WebSocket integration: **REST API (Trading)**: 1. **🔐 Authentication**: Use API key for all programmatic access 2. **📊 Fetch Market Data**: Get market info including venue contract addresses (once per market) 3. **📋 Order Creation**: Build and sign orders using EIP-712 structured data 4. **🚀 Order Submission**: Submit signed orders and receive confirmations **WebSocket API (Real-Time Data)**: 1. **🔌 Connection**: Connect to `/markets` namespace for real-time updates 2. **📊 Subscriptions**: Subscribe to market prices and position changes 3. **📡 Events**: Handle live market data and transaction updates ### 🔐 Authentication for API Users > **⚠️ DEPRECATION NOTICE**: Cookie-based session authentication is deprecated and will be removed within weeks. Please migrate to API keys immediately. | Method | Header | Status | |--------|--------|--------| | **API Key** | `X-API-Key: lmts_...` | ✅ Required for programmatic access | | Cookie Session | `Cookie: limitless_session=...` | ⚠️ Deprecated (removal imminent) | **Getting an API Key** API keys can only be created via the Limitless Exchange UI: 1. Log in to [limitless.exchange](https://limitless.exchange) using your wallet 2. Click your profile menu (top right) 3. Select "Api keys" 4. Generate a new key **Using Your API Key** Include in all requests via the `X-API-Key` header: ```bash # REST API curl -H "X-API-Key: lmts_your_key_here" https://api.limitless.exchange/markets # WebSocket - pass X-API-Key header during connection handshake ``` ### Migration from Cookie to API Key If you're currently using cookie-based authentication, migrate by: 1. **Generate an API key** via the UI (profile menu → Api keys) 2. **Replace cookie header** with API key header: ```diff # Before (deprecated) - Cookie: limitless_session=your_session_token # After + X-API-Key: lmts_your_key_here ``` 3. **Remove session management code** - no more login flow or cookie handling needed ### Important: Venue System for CLOB Markets CLOB markets use a **venue system** where each market is associated with specific contract addresses. Before placing orders: 1. **Fetch market data once**: `GET /markets/:slug` returns venue information 2. **Use venue.exchange**: This is the `verifyingContract` for EIP-712 order signing 3. **Cache the venue**: Venue data is static per market - fetch once and reuse **Sample venue response:** ```json { "venue": { "exchange": "0xA1b2C3...", "adapter": "0xD4e5F6..." } } ``` ### Required Approvals Before trading, set up token approvals based on order type: | Order Type | Market Type | Approve To | |------------|-------------|------------| | BUY | All CLOB | USDC → `venue.exchange` | | SELL | Simple CLOB | CT → `venue.exchange` | | SELL | NegRisk/Grouped | CT → `venue.exchange` AND `venue.adapter` | ### Checksummed Addresses All addresses must use **checksummed format** (EIP-55 mixed-case): - Authentication: `x-account` header - Orders: `maker` and `signer` fields - Example: `0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed` ### Implementation Guides **[🐍 Python Quick Start](#description/-python-quick-start)** - REST API: eth-account, requests, and web3.py libraries - WebSocket: python-socketio, asyncio integration **[☕ Java Quick Start](#description/-java-quick-start)** - REST API: Web3j, OkHttp3, and Jackson libraries **[📦 Node.js/TypeScript Quick Start](#description/-nodejs-typescript-quick-start)** - REST API: viem, ethers, and cross-fetch libraries - WebSocket: socket.io-client for real-time trading - Full TypeScript support with end-to-end examples **[🔌 WebSocket Integration](#description/-websocket-integration)** - Real-time market data and position updates - Production-ready Python client with authentication --- ## 🐍 Python Quick Start Complete end-to-end Python implementation for Limitless Exchange API integration. ### 🐍 Python E2E Order Creation Guide Complete Python implementation guide is being loaded from external documentation... **Guide Contents:** - 🔐 Complete authentication flow with eth-account - 📋 Order construction with Web3.py calculations - ✍️ EIP-712 structured data signing - 🚀 Order submission with requests library - ⚠️ Comprehensive error handling - 🛠️ Production deployment considerations *For the complete Python guide, ensure the file is available at docs/scripts-samples/python-e2e-order-creation.md* ## ☕ Java Quick Start Complete end-to-end Java implementation for Limitless Exchange API integration. ### ☕ Java E2E Order Creation Guide Complete Java enterprise implementation guide is being loaded from external documentation... **Guide Contents:** - 🔐 Complete authentication flow with Web3j - 📋 Order construction with BigInteger precision - ✍️ EIP-712 structured data signing - 🚀 Order submission with OkHttp3 - ⚠️ Enterprise error handling patterns - 🏗️ Production Maven project structure *For the complete Java guide, ensure the file is available at docs/scripts-samples/java-e2e-order-creation.md* ## 📦 Node.js/TypeScript Quick Start Complete end-to-end Node.js/TypeScript implementation for trading and WebSocket subscriptions. ### 📦 Node.js/TypeScript Trading & WebSocket Guide Complete Node.js/TypeScript implementation guide is being loaded from external documentation... **Guide Contents:** - 🔐 **Authentication**: Wallet-based auth with ethers and viem - 📋 **Order Creation**: EIP-712 signing with viem WalletClient - 🚀 **Order Submission**: REST API integration with cross-fetch - 🔌 **WebSocket Subscriptions**: socket.io-client for real-time updates - 📊 **Market Data**: AMM prices and CLOB orderbook subscriptions - ⚠️ **Type Safety**: Full TypeScript support with proper types - 🛠️ **Production Ready**: Complete end-to-end working example **Key Features:** - **Combined Subscriptions**: Subscribe to both AMM and CLOB markets simultaneously - **Authentication Flow**: Complete wallet-based authentication with session management - **Trading Integration**: Place orders and receive real-time updates - **TypeScript First**: Type-safe implementation with proper interfaces *For the complete Node.js guide, ensure the file is available at docs/scripts-samples/node-socket-trading-and-subscribe.md* ## 🔌 WebSocket Integration Real-time market data and position updates using WebSocket connections. ### 🔌 WebSocket Real-Time Integration Guide Complete WebSocket implementation guide is being loaded from external documentation... **Guide Contents:** - 🔌 **WebSocket Connection**: python-socketio client with async support - 🔐 **Authentication**: JWT session cookie integration - 📊 **Market Subscriptions**: Real-time price updates and position changes - ⚡ **Event Handling**: Comprehensive event processing patterns - 🔄 **Auto-Reconnection**: Production-ready reconnection logic - 🛠️ **Error Recovery**: Robust error handling and fallback strategies **Key Features:** - **Public Mode**: Market price updates without authentication - **Authenticated Mode**: Full access to positions and transactions - **Multi-Market Support**: Subscribe to multiple markets simultaneously - **Production Ready**: Tested patterns for production deployment *For the complete WebSocket guide, ensure the file is available at docs/scripts-samples/python-socket-subscribe.md* version: '1.0' contact: name: API Support url: https://limitless.exchange email: hey@limitless.network servers: - url: https://api.limitless.exchange description: Production API security: [] tags: - name: Authentication description: User authentication and session management - name: Markets description: Browse, search, and analyze prediction markets - name: Market Navigation description: Navigation tree, market pages, and property filters - name: Trading description: Create, manage, and cancel orders - name: Portfolio description: Position tracking, trade history, and performance - name: Feed description: Public trading activity feeds paths: /orders/batch-cancel: post: tags: - Trading summary: Batch Cancel Orders description: >- Cancel open orders by either internal orderIds or client-provided clientOrderIds. operationId: OrderController_batchCancelOrders parameters: - name: onBehalfOf required: false in: query description: >- Partner sub-account profile ID. Requires delegated_signing in addition to trading. schema: type: integer minimum: 1 example: 326 requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CancelOrderBatchCombinedDto' responses: '200': description: All orders successfully cancelled content: application/json: schema: oneOf: - $ref: '#/components/schemas/CancelOrderBatchResponseDto' - $ref: '#/components/schemas/CancelOrderBatchCombinedResponseDto' '207': description: Partial success - some orders cancelled, some failed content: application/json: schema: oneOf: - $ref: '#/components/schemas/CancelOrderBatchPartialResponse' - $ref: '#/components/schemas/ClientOrderBatchPartialResponse' '400': description: >- Orders from different markets, invalid order data, or no orders could be cancelled content: application/json: schema: oneOf: - $ref: '#/components/schemas/ValidationErrorResponse' - $ref: '#/components/schemas/NestErrorResponse' - $ref: '#/components/schemas/CancelOrderBatchAllFailedResponse' - $ref: '#/components/schemas/ClientOrderBatchAllFailedResponse' '401': description: User not authenticated or not the owner of all orders content: application/json: schema: $ref: '#/components/schemas/NestErrorResponse' '403': description: >- Missing trading or delegated_signing scope, or unauthorized delegation target content: application/json: schema: oneOf: - $ref: '#/components/schemas/ErrorMessageResponse' - $ref: '#/components/schemas/NestErrorResponse' '404': description: No supplied internal order ID resolved content: application/json: schema: $ref: '#/components/schemas/NestErrorResponse' '425': description: >- Cancellation is temporarily blocked because trading is disabled by maintenance mode. content: application/json: schema: $ref: '#/components/schemas/TradingDisabledErrorResponse' '500': description: Unexpected batch cancellation failure content: application/json: schema: $ref: '#/components/schemas/ErrorMessageResponse' security: - HmacAuth: [] components: schemas: CancelOrderBatchCombinedDto: type: object properties: orderIds: type: array description: >- Internal order IDs. Provide exactly one of orderIds or clientOrderIds. example: - 6f52b6d2-6c9e-4a5c-8a4f-28ab4b7ff203 minItems: 1 maxItems: 50 items: type: string format: uuid pattern: >- ^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$ clientOrderIds: type: array description: >- Client-provided order IDs from order creation. Provide exactly one of orderIds or clientOrderIds. example: - partner-order-001 - partner-order-002 minItems: 1 maxItems: 50 items: type: string maxLength: 128 additionalProperties: false oneOf: - required: - orderIds - required: - clientOrderIds CancelOrderBatchResponseDto: type: object properties: message: type: string description: Confirmation message for the cancelled orders example: Orders canceled successfully canceled: type: array description: Array of successfully cancelled order IDs example: - 611badac-8dfc-48a0-b09e-59654adea1c5 items: type: string format: uuid failed: description: Array of orders that failed to cancel with reasons type: array items: $ref: '#/components/schemas/CancelOrderFailure' required: - message CancelOrderBatchCombinedResponseDto: type: object properties: message: type: string example: Orders canceled successfully enum: - Orders canceled successfully - No orders canceled canceled: description: Canceled client-order-id records type: array items: $ref: '#/components/schemas/ClientOrderCancelSuccess' failed: description: Client-order-id cancel failures type: array items: $ref: '#/components/schemas/ClientOrderCancelFailure' required: - message CancelOrderBatchPartialResponse: type: object properties: message: type: string example: Orders canceled successfully canceled: type: array minItems: 1 items: type: string format: uuid failed: minItems: 1 type: array items: $ref: '#/components/schemas/CancelOrderFailure' required: - message - canceled - failed ClientOrderBatchPartialResponse: type: object properties: message: type: string example: Orders canceled successfully enum: - Orders canceled successfully - No orders canceled canceled: minItems: 1 type: array items: $ref: '#/components/schemas/ClientOrderCancelSuccess' failed: minItems: 1 type: array items: $ref: '#/components/schemas/ClientOrderCancelFailure' required: - message - canceled - failed ValidationErrorResponse: type: object properties: message: type: array items: $ref: '#/components/schemas/ValidationErrorItem' error: type: string enum: - Bad Request statusCode: type: number enum: - 400 additionalProperties: false required: - message - error - statusCode NestErrorResponse: type: object properties: message: type: string error: type: string statusCode: type: integer additionalProperties: false required: - message - error - statusCode CancelOrderBatchAllFailedResponse: type: object properties: message: type: string enum: - Failed to cancel any orders failed: minItems: 1 type: array items: $ref: '#/components/schemas/CancelOrderFailure' additionalProperties: false required: - message - failed ClientOrderBatchAllFailedResponse: type: object properties: message: type: string example: No orders canceled enum: - Orders canceled successfully - No orders canceled failed: minItems: 1 type: array items: $ref: '#/components/schemas/ClientOrderCancelFailure' required: - message - failed ErrorMessageResponse: type: object properties: message: type: string additionalProperties: false required: - message TradingDisabledErrorResponse: type: object properties: code: type: string enum: - trading_disabled message: type: string enum: - Trading is currently disabled. mode: type: string enum: - disabled resumeAt: type: string format: date-time additionalProperties: false required: - code - message - mode CancelOrderFailure: type: object properties: orderId: type: string description: Order ID that failed to cancel example: b53f0e4b-1529-45cc-ad39-e27f4c6eab5a format: uuid reason: type: string description: Error code indicating the reason for failure example: ORDER_NOT_FOUND enum: - ORDER_NOT_FOUND - UNKNOWN_ERROR message: type: string description: User-friendly error message example: Order not found or already canceled required: - orderId - reason - message ClientOrderCancelSuccess: type: object properties: clientOrderId: type: string description: Client-provided order ID from order creation example: partner-order-001 maxLength: 128 orderId: type: string description: Internal order ID example: 6f52b6d2-6c9e-4a5c-8a4f-28ab4b7ff203 format: uuid required: - clientOrderId - orderId ClientOrderCancelFailure: type: object properties: clientOrderId: type: string description: Client-provided order ID from order creation example: partner-order-002 maxLength: 128 orderId: type: string description: >- Internal order ID, when resolution succeeded before cancellation failed example: 6f52b6d2-6c9e-4a5c-8a4f-28ab4b7ff203 format: uuid reason: type: string description: Failure reason example: ORDER_NOT_FOUND enum: - ORDER_NOT_FOUND - UNKNOWN_ERROR message: type: string description: Human-readable failure message example: Order not found required: - clientOrderId - reason - message ValidationErrorItem: type: object properties: field: type: string example: orderIds message: type: string example: orderIds should not be empty additionalProperties: false required: - field - message securitySchemes: HmacAuth: type: apiKey in: header name: lmts-api-key description: >- Scoped API token with HMAC-SHA256 signing. Requires three headers: lmts-api-key (token ID), lmts-timestamp (ISO-8601), lmts-signature (Base64-encoded HMAC). See Authentication docs for details. ````