> ## Documentation Index > Fetch the complete documentation index at: https://docs.adipredictstreet.com/llms.txt > Use this file to discover all available pages before exploring further. # Cancel a single order > Idempotent — a never-existed or already-terminal id returns 200 with `status=not_found`, NOT 404. Authentication scope is checked against the order owner, not the JWT wallet alone. ## OpenAPI ````yaml /api-reference/openapi.json post /api/orders/cancel openapi: 3.1.0 info: title: PredictStreet core-api description: >- Client-facing HTTP gateway for the PredictStreet prediction-market platform. **Partner kinds.** Every authenticated endpoint resolves a request's *effective wallet* from the partner row. `single_wallet` partners bind to one `associatedWallet` set at creation. `multi_wallet` partners declare the actor on every request via an `X-User-Wallet: 0x<40-hex>` header. See the [Partner kinds](/auth/api-keys#partner-kinds) doc for the full contract. version: '2026-04-25' contact: name: PredictStreet partners email: partners@predictstreet.com servers: - url: https://core-api.adipredictstreet.com description: Production — replace with the API host issued at partner onboarding. security: [] tags: - name: Events description: >- Polymarket-style event grouping with football metadata (group, stage, teams, tags). - name: Tags description: Curated tag taxonomy used to filter events. - name: Markets description: 'Public market data: list, detail, orderbook, trades, OHLC.' - name: Orders description: >- Signed-order place / cancel / read. Requires `X-Api-Key` with `orders:read` / `orders:write` scope; every write additionally requires an EIP-712 signature over the order. - name: Portfolio description: >- Balances, positions, trades, fees, vault info for the key's `associatedWallet`. Requires `X-Api-Key` with `portfolio:read` scope. - name: Matches description: >- admin.matches aggregate — groups several events into one fixture/card (1X2 + first-scorer + over-under under one matchup). - name: Vault description: >- Backend co-signatures for ERC-1155 split / merge, and recovery for off-chain locks when the corresponding chain tx never confirmed. Requires `X-Api-Key` with `vault:write` scope plus an EIP-712 signature over the operation. - name: Leaderboard description: Public ranked leaderboard across PnL / volume buckets. - name: Search description: Global search across users, events, and matches. paths: /api/orders/cancel: post: tags: - Orders summary: Cancel a single order description: >- Idempotent — a never-existed or already-terminal id returns 200 with `status=not_found`, NOT 404. Authentication scope is checked against the order owner, not the JWT wallet alone. operationId: OrdersController_cancel parameters: - $ref: '#/components/parameters/UserWalletHeader' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CancelOrderDto' type: object required: - orderId properties: orderId: type: string responses: '200': description: '' content: application/json: schema: $ref: '#/components/schemas/CancelOrderRespDto' '201': description: >- Cancel request forwarded to exchange-service. Response mirrors the service's cancellation envelope. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' type: object '400': description: Missing or malformed orderId. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '401': description: Missing or invalid auth. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '403': description: API-key caller is missing the orders:write scope. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' '429': description: Rate-limited (20 per second per wallet). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' security: - ApiKeyAuth: - orders:write components: parameters: UserWalletHeader: name: X-User-Wallet in: header required: false description: >- **Required for `multi_wallet` partners on every authenticated request; ignored for `single_wallet`.** Declares the acting end-user wallet for this request — drives KYC checks, balances/positions/orders attribution, rate-limit buckets, and audit. Lower-cased server-side. Missing on a multi_wallet key → 401 `api_key_user_wallet_required`; malformed → 401 `api_key_user_wallet_invalid`. The on-chain `CTFExchange`/`Vault` contracts still verify EIP-712 signer ↔ vault binding, so loosening API-layer attribution is safe by construction. schema: $ref: '#/components/schemas/EthereumAddress' example: '0x1234567890abcdef1234567890abcdef12345678' schemas: CancelOrderDto: type: object properties: orderId: type: string description: Server-side order id (UUID). required: - orderId CancelOrderRespDto: type: object properties: orderId: type: string description: Server-side order id (echoes the request). status: type: string enum: - cancelled - not_found description: >- Cancel outcome. `not_found` is returned (200, NOT 404) when the id never existed for this wallet OR was already terminal — keeps the cancel call idempotent (audit M6). unfilledQty: type: string description: >- Quantity that was still unfilled at cancel time (only set when status=cancelled). required: - orderId - status ErrorEnvelope: type: object required: - error properties: status: type: integer example: 400 error: type: object required: - code - message properties: code: type: string example: bad_request message: type: string details: type: object additionalProperties: true trace_id: type: string EthereumAddress: type: string pattern: ^0x[a-fA-F0-9]{40}$ example: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb3' securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-Api-Key description: >- Partner / integrator key — format `ps_live__`. Issued by PredictStreet ops on request; never self-service. Never ship to a browser. `multi_wallet` partners must additionally send `X-User-Wallet: 0x<40-hex>` on every authenticated request to declare the acting wallet. See the [API keys guide](/auth/api-keys) for scope taxonomy, partner kinds, rate limits, and rotation procedure. ````