> ## Documentation Index > Fetch the complete documentation index at: https://doc.astreus.ai/llms.txt > Use this file to discover all available pages before exploring further. # FX reference rates > FX reference-rate board: every fiat currency against USD (units per 1 USD) at the latest complete weekday, the session before and 1W–10Y back, with two years of weekly closes (Frankfurter central-bank blend). ## OpenAPI ````yaml https://astreus.ai/openapi.json get /api/v1/fx openapi: 3.1.0 info: title: Astreus API version: '2026-11-11' description: >- Astreus is a financial data terminal that turns the world's unstructured financial disclosure into structured, traceable data. It reads what companies, exchanges and central banks publish — annual and interim reports, SEC filings, results announcements, investor presentations, earnings calls, 8-Ks, regulator notices and policy text — across the United States, the Gulf (Tadawul, DFM, ADX, Boursa Kuwait, QSE), Japan, Taiwan, Korea, the UK and Europe, and serves it as data a program can trust: standardized financial statements (annual, quarterly, semiannual), segments and KPIs, the tables inside the notes, filing sections as text, investor decks page by page, earnings-call transcripts and audio, span-anchored observations, management guidance scored against outcomes, typed 8-K events, an attributed intraday news tape, insider and 13F ownership, a people registry, macro series (the current vintage: the latest published value for each period) and central-bank text, benchmark, commodity and compute-price series, and a source-linked claim graph with declared validation limits. Use `fact-source` and document metadata to retain available provenance. Publication and entitlement gates apply per dataset; inspect availability and tool limitations. Coverage is published live: `GET /api/v1/landing/coverage` (no key) returns every market served with company counts, history depth, completeness and periods held per data type — ask it before answering "what do you cover?". `{id}` is a ticker, a numeric SEC CIK, or a platform key for a non-SEC issuer (XSAU000001) — the `cik` field of the company payload. Human-readable guides: https://doc.astreus.ai (coverage at /coverage, data catalog at /data-catalog). Tiers: `public` endpoints need no credentials. Everything else takes an **API key** — create one on the Developers page in the terminal (https://astreus.ai/developers) and send it as `X-API-KEY: pk_live_...` (or `Authorization: Bearer pk_live_...`). Signed-in terminal sessions may use their Cognito ID token instead. Rate limits and quotas are per plan (fixed UTC windows): Free — 30 req/min, 250 req/day; Build — 300 req/min, 100,000 req/month; Scale — custom. Build, Scale and prepaid credits are set up with sales (https://astreus.ai/contact), not self-serve. Responses carry RateLimit-*, X-Quota-* and, when credits pay, X-Billing-Source/X-Credits-Remaining-USD headers; a 429 carries `Retry-After` and a machine `code` of rate_limited or quota_exceeded (with sales_email). Server-side use: `/api/v1` sends no CORS headers, so a browser page on another origin cannot call it. Call it from a server, a script or an agent, and keep the key there. Versioning: `info.version` is the UTC date the contract last changed, and every response carries it in `x-astreus-api-version`. Within `/api/v1` changes are additive; a field or parameter that will go is marked `deprecated` first and kept for at least 90 days. Policy: https://doc.astreus.ai/versioning. Not investment advice. See /terms. contact: email: saif@astreus.ai termsOfService: https://astreus.ai/terms license: name: 'Proprietary: Astreus terms of service' url: https://astreus.ai/terms servers: - url: https://astreus.ai security: [] tags: - name: Search & Meta description: Entity resolution and platform metadata. - name: Company Data description: Profiles, structure, leadership, calendars. - name: Geo & Assets description: >- Physical assets on the map — what a company owns, operates or develops, where, since when, at what location precision, and the source behind each fact. - name: Financial Statements description: >- Standardized XBRL-derived statements — every line traceable to its filing via fact provenance. - name: SEC Filings description: >- The filing index and documents (SEC and exchange-published), parsed section text, and the tables inside the notes as gated grids and series. - name: 8-K Events description: >- Material events: 8-K items and exchange disclosures by item code, filterable by family, with extracted item text. - name: News description: >- The intraday news tape: filings, releases and licensed wires with source attribution, storylines and topics. - name: Transcripts & Calls description: Earnings-call transcripts, span-anchored observations, IR decks. - name: Guidance & Scorecards description: What management promised vs. what happened. - name: Ownership & Insiders description: 13F holders, Forms 3/4/5, the people registry. - name: Macro description: >- Economic series (the current vintage: the latest published value for each period) and central-bank text. - name: Market Data description: Daily bars for stocks, benchmarks, commodities and compute. - name: Intelligence description: Narratives and source-linked claims with declared validation status. - name: Analytics description: Charting over any catalog series. paths: /api/v1/fx: get: tags: - Market Data summary: FX reference rates description: >- FX reference-rate board: every fiat currency against USD (units per 1 USD) at the latest complete weekday, the session before and 1W–10Y back, with two years of weekly closes (Frankfurter central-bank blend). operationId: get-fx-reference-rates parameters: - name: base in: query description: >- ISO 4217 code: the board re-based on this currency (units per 1 base, the base's return against each); unknown currency 404. schema: type: string - name: region in: query description: 'With base: one region.' schema: type: string enum: - majors - europe - middle_east - asia_pacific - americas - africa - other - name: codes in: query description: 'With base: ISO 4217 codes, comma-separated, up to 60.' schema: type: string responses: '200': description: OK content: application/json: schema: type: object properties: board: type: object properties: asOf: type: string format: date pointDates: type: object properties: last: type: string format: date d1: type: string format: date w1: type: string format: date m1: type: string format: date m3: type: string format: date m6: type: string format: date y1: type: string format: date y2: type: string format: date y5: type: string format: date y10: type: string format: date base: type: object properties: code: type: string name: type: string lastDate: type: string format: date rows: type: array items: type: object properties: code: type: string name: type: string region: type: string last: type: number returns: type: object properties: d1: type: number w1: type: number m1: type: number m3: type: number m6: type: number y1: type: number y2: type: number y5: type: number y10: type: number spark: type: array items: type: number lastDate: type: string format: date stale: type: boolean source: type: object properties: name: type: string url: type: string note: type: string description: >- Inferred from captured responses: every field shown was returned by a real call; a field may be absent or null on other calls. x-schema-source: inferred example: board: asOf: '2026-10-30' pointDates: last: '2026-10-30' d1: '2026-10-29' w1: '2026-10-23' m1: '2026-09-30' m3: '2026-07-30' m6: '2026-04-30' y1: '2025-10-30' y2: '2024-10-30' y5: '2021-10-29' y10: '2016-10-28' base: code: USD name: United States Dollar lastDate: '2026-10-30' rows: - code: EUR name: Euro region: majors last: 0.8951 returns: d1: -0.0007925787834474063 w1: 0.00424090113539477 m1: 0.016096807882667985 m3: 0.02479849789338706 m6: 0.04686385273031357 y1: 0.03937574751216344 y2: -0.030416603479278104 y5: 0.04097130961657003 y10: -0.021973099070158764 spark: - 0.91964 - 0.92713 lastDate: '2026-10-30' stale: false - code: AED name: United Arab Emirates Dirham region: middle_east last: 3.6725 returns: d1: 0 w1: 0 m1: 0 m3: 0 m6: 0 y1: 0 y2: 0 y5: 0 y10: 0 spark: - 3.6725 - 3.6725 lastDate: '2026-10-30' stale: false source: name: Frankfurter url: https://frankfurter.dev note: >- Blended reference rates from central banks and official publishers. '400': description: >- A query parameter the route does not take (unknown_parameter), a value outside its type, enum or range (invalid_parameter), or a required one missing (missing_parameter); `param` names it. A request refused against this spec's parameter list is not metered. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Missing or invalid bearer token. content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Unknown company, country, symbol or resource. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Rate limited. Honour Retry-After. content: application/json: schema: $ref: '#/components/schemas/Error' security: - apiKey: [] - cognitoIdToken: [] components: schemas: Error: type: object required: - error - code properties: error: type: string description: Human-readable message. It may change; branch on `code`. code: type: string description: >- Stable machine code; every error carries one. unknown_parameter, invalid_parameter and missing_parameter come with `param`; unknown_parameter also with `allowed`. A route may add codes of its own (e.g. key_limit); treat an unlisted code by its HTTP status. enum: - unknown_parameter - invalid_parameter - missing_parameter - invalid_request - unauthenticated - upgrade_required - forbidden - not_found - conflict - too_large - unsupported_media_type - rate_limited - quota_exceeded - auth_unavailable - upstream_unavailable - internal_error param: type: string description: The query parameter at fault, when one is. allowed: type: array items: type: string description: 'With unknown_parameter: every query parameter the route takes.' securitySchemes: apiKey: type: apiKey in: header name: X-API-KEY description: >- Astreus API key (pk_live_...), created on the Developers page in the terminal. Also accepted as `Authorization: Bearer pk_live_...`. x-default: pk_live_YOUR_KEY cognitoIdToken: type: http scheme: bearer bearerFormat: JWT description: >- Amazon Cognito ID token (token_use=id) for the Astreus user pool — the terminal's own session credential. API consumers should use an API key instead. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.