> ## Documentation Index > Fetch the complete documentation index at: https://docs.filexpress.app/llms.txt > Use this file to discover all available pages before exploring further. # Resolve the rate for a document > The rate that would be applied to a document for the given branch, currency and date: the rate for that day or the latest earlier one (a branch rate takes priority over the general one). `exact` is false if an earlier date was used. **Required permission:** `currencies` ## OpenAPI ````yaml /api-reference/openapi.en.json get /v2/exchange-rates/resolve openapi: 3.0.3 info: title: FileXpress External API version: 1.0.0 description: >- API for integrating third-party systems with FileXpress: billing, HR, accounting, inventory, projects, accounts receivable and payable, treasury, pricing and promotions, and cash. Current base URL: /api/external/v1. The legacy unversioned path (/api/external) will be removed on January 1, 2027; migrate to /api/external/v1 (same endpoints, only the base URL changes). The v2 API (/api/external/v2) exposes currencies and exchange rates, sales and purchases in foreign currency, taxes by id, payrolls with branch, and errors with a stable `code`; its operations carry the /v2 prefix in the path. We suggest migrating to the available v2 routes before March 30, 2027. servers: - url: https://api.filexpress.app/api/external/v1 description: Production security: - ApiKey: [] tags: - name: General - name: Billing · Sales - name: Billing · Purchases - name: Billing · Customers - name: Billing · Suppliers - name: Billing · Products - name: Catalogs - name: HR · Employees - name: HR · Attendance - name: HR · Labor rules - name: HR · Schedules - name: HR · Holidays - name: HR · Attendance results - name: HR · Leave requests - name: HR · Payrolls - name: Accounting - name: Inventory - name: Projects - name: Accounts receivable - name: Accounts payable - name: Treasury - name: Pricing and promotions - name: Cash - name: Points of sale - name: API v2 · General - name: API v2 · Currencies and rates - name: API v2 · Countries - name: API v2 · Sales - name: API v2 · Purchases - name: API v2 · Payrolls paths: /v2/exchange-rates/resolve: get: tags: - API v2 · Currencies and rates summary: Resolve the rate for a document description: >- The rate that would be applied to a document for the given branch, currency and date: the rate for that day or the latest earlier one (a branch rate takes priority over the general one). `exact` is false if an earlier date was used. **Required permission:** `currencies` parameters: - name: branch_id in: query required: true description: Branch of the integration's business. schema: type: string format: uuid example: 9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11 - name: currency in: query required: true description: 3-letter code. schema: type: string example: GTQ - name: date in: query required: false description: 'Document date (default: today).' schema: type: string format: date example: '2026-10-17' responses: '200': description: Success content: application/json: schema: type: object required: - status - data properties: status: type: boolean example: true data: type: object properties: currency_code: type: string base_currency_code: type: string rate: type: string effective_date: type: string format: date exact: type: boolean source: type: string description: Source. enum: - manual - api - base required: - currency_code - base_currency_code - rate - effective_date - exact - source example: status: true data: currency_code: GTQ base_currency_code: USD rate: '0.12800000' effective_date: '2026-10-15' exact: false source: manual '401': $ref: '#/components/responses/E401' '403': description: >- Missing the `currencies` permission, or multi-currency not enabled for the business content: application/json: schema: $ref: '#/components/schemas/V2Error' examples: scope: summary: Sin el permiso currencies value: status: false message: >- This integration does not have the 'currencies' permission. required_scope: currencies flag: summary: Multi-moneda deshabilitada value: status: false code: currency_not_enabled message: Multi-moneda no está habilitada para esta empresa. '404': description: No rate on or before the date content: application/json: schema: $ref: '#/components/schemas/V2Error' example: status: false code: exchange_rate_not_found message: >- No hay tasa de cambio para GTQ a la fecha 2026-10-01 ni anterior. Registre una tasa de cambio o envíe exchange_rate en el documento. errors: exchange_rate: Sin tasa de cambio para GTQ al 2026-10-01. '422': description: Invalid parameters or currency not active content: application/json: schema: $ref: '#/components/schemas/V2Error' examples: validation_error: summary: Parámetro inválido value: status: false code: validation_error message: Validation errors errors: currency: - Obligatoria (código de 3 letras). currency_not_enabled: summary: Moneda no activa value: status: false code: currency_not_enabled message: La moneda GTQ no está activa para este negocio. errors: currency: La moneda GTQ no está activa. '429': $ref: '#/components/responses/E429' servers: - url: https://api.filexpress.app/api/external description: Production (v2 routes are prefixed with /v2) components: responses: E401: description: Missing or invalid API Key content: application/json: example: status: false message: Invalid API Key. E429: description: Rate limit exceeded content: application/json: example: status: false message: Rate limit exceeded. Please try again later. rate_limit: 100 schemas: V2Error: type: object properties: status: type: boolean example: false code: type: string description: >- Stable error code. Evaluate this field instead of the `message` text. Responses from the access layer (API Key, permission, rate limit) and the 404 for a resource of another business may not include it: use the HTTP code. enum: - currency_not_enabled - exchange_rate_not_found - exchange_rate_invalid - base_currency_not_legal - validation_error - tax_invalid - payment_method_invalid - tax_not_supported_in_expenses - country_not_supported - country_data_invalid - idempotency_key_reused - idempotency_in_progress - unauthorized - forbidden - not_found - rate_limited - error message: type: string errors: oneOf: - type: object additionalProperties: true description: Field -> message(s) (validation and currency). - type: array description: 'Only in `tax_invalid`: one entry per tax problem.' items: type: object properties: field: type: string code: type: string description: Detail of the tax problem. enum: - tax_not_found - tax_wrong_effect - tax_country_mismatch - tax_not_in_lines - tax_totals_inconsistent - tax_amount_mismatch - withholding_totals_inconsistent - withholding_amount_mismatch message: type: string tax_id: type: string format: uuid required: - field - code - message description: Optional. Its shape depends on the error. required: - status - message securitySchemes: ApiKey: type: apiKey in: header name: X-API-Key description: Integration API Key (Integrations → New Integration). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.