> ## 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. # Read the receipt of one balance operation > Preview: served on the sandbox to every venue; production availability is arranged when a venue qualifies. Trading API keys and Partner keys do not authorize these routes. Requires a verified authorized operator session; writes require a trusted origin. account:read. Runs the same operation the Legacy Partner API route runs, and refuses the same things; this is the venue twin of it, not a second implementation. The durable result of one balance operation by its reference, which through the venue door was the Idempotency-Key of the write. This is how a backend settles a write whose answer it lost, without a second key. `legacy_unknown` names a row the old path recorded without a durable outcome. ## OpenAPI ````yaml /partner-platform/openapi.json get /api/operator/venues/{venueId}/balance-ops/{referenceId} 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: Venue platform preview description: >- The venue routes, in preview: a venue’s providers, instruments, conditions, groups, routes, stages, level 2, keys, accounts, usage, balance receipts and webhooks. Served on the sandbox to every venue; production availability is arranged when a venue qualifies. Every route documented here under /api/partner/ takes a Venue key and is also served under /api/operator/ to a verified owner session, by the same router with a different credential: a browser never holds a Venue key, so the back office reaches the identical checks that way. Additive-only from here; the Legacy Partner API routes remain unchanged. - name: Market data description: >- Symbol search and resolution, OHLCV history, quote snapshots, the server clock, and the live bar stream. Crypto rides each provider’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 Trading 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 routes: 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 account at a provider (or opens their own Demo on the paper book) in the app, and a venue issues accounts on the paper book (Venue platform → Issue an account into a group; the Legacy Partner API’s Create evaluation accounts does the same) or pre-registers accounts at a provider through Connect (Pre-register a trader’s account). Account state and the durable ledgers: balances, positions, working orders, fills, P&L history, and the live account stream. - name: Connect description: >- Connect is the account picker a trader opens, in our app or embedded on a firm’s site: the built-in providers, plus every listed venue. These three routes are how a firm PRE-FILLS it. You tell us a trader has an account at a built-in provider (their sign-in email, and optionally the account number and login name); when that trader signs in, Connect shows the account ready to link and they sign in to the provider themselves, once. Nothing here sends a password or grants access before the trader’s own login succeeds. You can list who you pre-registered and who has linked, and cancel a pre-registration that has not been used. Pre-registrations expire after 30 days; repeating one refreshes it. These routes take the Partner key and are Connect’s own; they are not part of the Legacy Partner API. The end-to-end flow is **[Quick Start](/docs/guides/quick-start)**. - name: Firm accounts (legacy) description: >- Legacy Partner API. Every route in this group has a venue twin under `/api/partner/venues/{venueId}/accounts…`, reached with a Venue key and a named scope, and new integrations use those; this group stays for firms that predate venues, and the same operation runs behind both. Evaluation accounts your firm issues on the paper book, through your Partner key. Connect pre-registers accounts that exist at a provider; these routes create and manage accounts on the paper book: 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: Billing description: >- Legacy Partner API, per firm. What your firm is billed for in a month, computed from the execution ledger, and the accounts behind the number. The venue platform will carry per-venue usage; until it does these two routes answer the Partner key. - name: Webhooks description: >- Legacy Partner API, being replaced by venue-scoped events, which are not built yet; this is the one job a venue-only backend still needs a Partner key for, and nothing here is removed until they are. 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 every venue alike: the account-registration (`registration.*`) events fire wherever Connect does, and the account events fire where the prop engine runs. - name: Challenges description: >- Legacy Partner API, being replaced by stage rules on the venue, which carry the firm’s half of this; the trader’s enroll flow has not moved yet. The prop evaluation routes: 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 admin half of this is deliberately not documented here. It is platform administration, not licensed API. paths: /api/operator/venues/{venueId}/balance-ops/{referenceId}: get: tags: - Venue platform preview summary: Read the receipt of one balance operation description: >- Preview: served on the sandbox to every venue; production availability is arranged when a venue qualifies. Trading API keys and Partner keys do not authorize these routes. Requires a verified authorized operator session; writes require a trusted origin. account:read. Runs the same operation the Legacy Partner API route runs, and refuses the same things; this is the venue twin of it, not a second implementation. The durable result of one balance operation by its reference, which through the venue door was the Idempotency-Key of the write. This is how a backend settles a write whose answer it lost, without a second key. `legacy_unknown` names a row the old path recorded without a durable outcome. parameters: - name: venueId in: path required: true schema: type: string format: uuid - name: referenceId in: path required: true schema: type: string maxLength: 80 responses: '200': description: 'Scoped result. Cache-Control: no-store.' content: application/json: schema: $ref: '#/components/schemas/VenueBalanceReceiptResponse' '400': description: Invalid input, cursor or required request/version header. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Required credential missing or invalid. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: >- Verified identity, current owner membership or required scope missing. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Disabled feature, unavailable resource or wrong venue/environment. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: Changed idempotent request or stale version. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '413': description: Request exceeds the bounded body size. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '415': description: JSON body required. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '503': description: Service or credential vault unavailable; no success is implied. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - sessionCookie: [] x-codeSamples: - lang: javascript label: TypeScript source: >- // First-party cookie auth: this runs in a signed-in trdrs session, not under an API key. const res = await fetch('https://app.trdrs.co/api/operator/venues/{venueId}/balance-ops/{referenceId}', { credentials: 'include', }) const data = await res.json() - lang: shell label: cURL source: >- curl 'https://app.trdrs.co/api/operator/venues/{venueId}/balance-ops/{referenceId}' \ -b "session=$TRDRS_SESSION" components: schemas: VenueBalanceReceiptResponse: type: object additionalProperties: false properties: referenceId: type: string accountNumber: type: string op: type: string enum: - credit - debit - adjustment amount: type: string state: type: string enum: - applied - legacy_unknown appliedAt: type: - string - 'null' format: date-time required: - referenceId - accountNumber - op - amount - state - appliedAt example: referenceId: payout-2026-08-31-a accountNumber: EVAL-7C21A9 op: debit amount: '800' state: applied appliedAt: '2026-09-14T12:00:00.000Z' ErrorResponse: type: object properties: error: type: string required: - error example: error: invalid_instrument securitySchemes: sessionCookie: type: apiKey in: cookie name: session description: >- The signed session cookie of a logged-in trdrs user. First-party/browser only; an API key cannot reach a route secured this way. ````