> ## Documentation Index > Fetch the complete documentation index at: https://docs.trdrs.co/llms.txt > Use this file to discover all available pages before exploring further. # Cancel an order > Cancels one resting order by `brokerOrderId` (the id the account stream and the orders read carry). The engine answers only after the venue accepts the cancel, and the copier mirrors the cancel to follower accounts only post-acceptance, so leaders and followers never disagree about what rests. The account stream is the truth of what remains either way. ## OpenAPI ````yaml /partner-platform/openapi.json post /api/trading/cancel openapi: 3.1.0 info: title: trdrs Engine API version: 1.1.0 description: >- ## API Reference This is the served OpenAPI contract for the trdrs engine: market data, trading and account routes for your firm's traders, trdrs Connect account-registration handoff, and preview challenge routes. See Quick Start for the first integration path: key setup, market config, chart data, Connect account registrations, idempotency, stream reconnects, and conformance. See Overview and API Standards for the cross-cutting contract rules. servers: - url: https://app.trdrs.co description: Production - url: / description: This engine security: [] tags: - name: Market data description: >- Symbol search and resolution, OHLCV history, quote snapshots, the server clock, and the live bar stream. Crypto rides each venue’s public feed; futures stream from the caller’s own connected Rithmic account. With none connected, futures requests answer 503 `feed_requires_connection`. - name: News description: >- Aggregated market news and the economic calendar, from licensed/open sources, keyword-tagged with futures roots at ingest. Platform-wide content (nothing per-user), admitted exactly like Market data: a licensed origin, a session, or a firm API key. Headlines page by published time, scope by instrument root, and stream live over SSE; thumbnails serve through the image proxy. - name: Trading description: >- The money surface: entries, exits, replaces, cancels, and position/account flattening. Every order-placing call uses `clientOrderId` as its idempotency key. - name: Account description: >- Reading a connected account. You do not create trading accounts here: a trader connects their own broker account (or creates a free demo account) in the app, and firms create evaluation accounts through the Partner API (Firm accounts → Create evaluation accounts) or register venue accounts through Connect (Create an account registration). Account state and the durable ledgers: balances, positions, working orders, fills, P&L history, and the live account stream. - name: Connect description: >- trdrs Connect account registration, for partner firms. Register an account you issued on your own venue — a pending account registration — with the trader’s sign-in email, optionally the venue account id and the login name your venue issued. The trader finds it waiting in the connect flow the moment they sign in with that email: the connect step is pre-filled with everything except the credential, which the trader always enters themselves. A registration never transmits a password and never grants access to anything before the trader’s own login succeeds. These routes answer a partner-scoped key only; a firm API key or a user session gets 401. Registrations expire after 30 days; re-registering the same email + account refreshes the expiry instead of duplicating. The end-to-end flow guide is **[Quick Start](/docs/guides/quick-start)**. - name: Firm accounts description: >- Evaluation accounts your firm issues on the trdrs venue, through your partner key — the other half of account setup. Connect registrations hand off accounts that exist on your venue; these routes create and manage accounts on ours: the trader trades them on trdrs, and your firm owns the lifecycle. Every route is scoped to accounts your firm created through this API — an account the same trader opened themselves is invisible and untouchable here, by construction. Creation is batched with per-item results, and every write carries your own `referenceId`, so a crashed pipeline retries safely. Served when the deployment runs the prop engine; without it, every route in this group answers `404`. - name: Webhooks description: >- The outbound event bus: register an https endpoint and the platform pushes events to it instead of your back office polling us. Every delivery is signed (`trdrs-signature: t=,v1=` over `${t}.${rawBody}`) so you can prove it came from us and is fresh, and every delivery is durable — a failed attempt is retried with backoff for about nine hours and the whole log is readable, so an endpoint that was down is a delay rather than a lost event. Serves brokers and prop firms alike: the account-registration (`registration.*`) events fire wherever Connect does, and the account events fire where the prop engine runs. - name: Challenges description: >- The prop evaluation surface: challenge programs and a trader’s own enrollments. **Preview: the one group on this page outside the additive-only guarantee** (the pre-contract v1 scaffold; the Phase-1 rebuild will change these shapes; see Stability). **Cookie-authenticated, not key-authenticated**, and served only when the engine runs with `CHALLENGES_ENABLED`; without that flag the bundle is absent and every route below returns `404`. The firm-console/admin half of this surface is deliberately not documented here. It is back office, not licensed surface. paths: /api/trading/cancel: post: tags: - Trading summary: Cancel an order description: >- Cancels one resting order by `brokerOrderId` (the id the account stream and the orders read carry). The engine answers only after the venue accepts the cancel, and the copier mirrors the cancel to follower accounts only post-acceptance, so leaders and followers never disagree about what rests. The account stream is the truth of what remains either way. parameters: - name: broker in: query schema: type: string - name: account in: query schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CancelOrderRequest' responses: '200': description: Accepted '401': description: Missing/unknown/revoked credential content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - tenantKey: [] x-codeSamples: - lang: javascript label: TypeScript source: |- const res = await fetch('https://app.trdrs.co/api/trading/cancel', { method: 'POST', headers: { 'content-type': 'application/json', Authorization: `Bearer ${process.env.TRDRS_API_KEY}`, }, body: JSON.stringify({ "brokerOrderId": "234992187" }), }) const data = await res.json() - lang: shell label: cURL source: |- curl -X POST 'https://app.trdrs.co/api/trading/cancel' \ -H "Authorization: Bearer $TRDRS_API_KEY" \ -H 'content-type: application/json' \ -d '{"brokerOrderId":"234992187"}' components: schemas: CancelOrderRequest: type: object properties: brokerOrderId: type: string required: - brokerOrderId example: brokerOrderId: '234992187' ErrorResponse: type: object properties: error: type: string required: - error example: error: invalid_instrument securitySchemes: tenantKey: type: http scheme: bearer description: >- Your firm’s API key (the API calls this the `tenant` key; `trdrs_sk_…`), server-to-server only. ````