> ## Documentation Index > Fetch the complete documentation index at: https://docs.usecroma.com/llms.txt > Use this file to discover all available pages before exploring further. # Banxico Circulars > The chronological index of every circular and disposición issued by Banco de México (1,200+ entries back to 1969), each with subject, abrogation status, and which base circular it modifies. One row per index entry: a circular amending several bases appears once per base. Optional `year` filters one year. Paged, 100 per page; drill into one with `banxico-circular`. ## OpenAPI ````yaml /api-reference/openapi.json post /mx/banxico/circulars/v1 openapi: 3.1.0 info: title: Croma Marketplace API version: 1.0.0 description: >- Government-data APIs for Colombia, Peru, Mexico, and global web search. Croma normalizes public-sector data into structured JSON for product teams and AI agents. servers: - url: https://api.croma.run security: [] paths: /mx/banxico/circulars/v1: post: tags: - Mexico - Banco de México summary: Banxico Circulars description: >- The chronological index of every circular and disposición issued by Banco de México (1,200+ entries back to 1969), each with subject, abrogation status, and which base circular it modifies. One row per index entry: a circular amending several bases appears once per base. Optional `year` filters one year. Paged, 100 per page; drill into one with `banxico-circular`. operationId: banxico_circulars requestBody: required: true content: application/json: schema: type: object required: [] properties: year: type: string default: '' description: Optional 4-digit year filter. page: type: integer minimum: 1 maximum: 1000 default: 1 description: 1-based page number for paginated results. additionalProperties: false example: year: '2026' responses: '200': description: Successful response headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string X-RateLimit-Limit: description: Requests allowed in the current window. schema: type: integer X-RateLimit-Remaining: description: Requests left before you are throttled. schema: type: integer X-RateLimit-Reset: description: ISO 8601 timestamp when the window resets. schema: type: string format: date-time X-Cache: description: HIT or MISS. Cached hits still count against your quota. schema: type: string enum: - HIT - MISS content: application/json: schema: $ref: '#/components/schemas/BanxicoCircularsResponse' '400': description: Invalid request body headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string content: application/json: schema: $ref: '#/components/schemas/ApiError' '401': description: Missing or invalid API key headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string content: application/json: schema: $ref: '#/components/schemas/ApiError' '429': description: Rate limit exceeded headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string X-RateLimit-Limit: description: Requests allowed in the current window. schema: type: integer X-RateLimit-Remaining: description: Requests left before you are throttled. schema: type: integer X-RateLimit-Reset: description: ISO 8601 timestamp when the window resets. schema: type: string format: date-time Retry-After: description: Seconds to wait before retrying. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/ApiError' '500': description: Internal error headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string content: application/json: schema: $ref: '#/components/schemas/ApiError' '502': description: Upstream source returned an error headers: X-Request-Id: description: >- Unique id for the request (req_…). Include it in support reports. schema: type: string content: application/json: schema: $ref: '#/components/schemas/ApiError' security: - bearerAuth: [] externalDocs: description: Interactive documentation and examples url: https://docs.usecroma.com/guides/mexico/banxico components: schemas: BanxicoCircularsResponse: type: object required: - data properties: data: type: object required: - year - circulars - pagination properties: year: type: - integer - 'null' description: Echo of the year filter; null when listing every year. circulars: type: array items: $ref: '#/components/schemas/BanxicoCircularSummary' pagination: type: object required: - total - page_size - total_pages - page properties: total: type: integer page_size: type: integer total_pages: type: integer page: type: integer ApiError: type: object required: - error properties: error: type: object required: - type - code - message properties: type: type: string description: >- Broad category: invalid_request_error, authentication_error, not_found_error, rate_limit_error, upstream_error, api_error. code: type: string description: Machine-readable specific code. message: type: string description: Human-readable explanation, safe to surface in UI. param: type: string description: Field that triggered the error. Present on validation errors. details: type: object description: Free-form structured detail. BanxicoCircularSummary: type: object required: - number - year - subject - modifies - abrogated - has_detail properties: number: type: string description: As printed in the index, e.g. `11/2026`, `E-126/2013`, `S/N`. year: type: integer subject: type: string modifies: type: - string - 'null' description: Base circular number when this entry modifies another. abrogated: type: boolean has_detail: type: boolean description: Whether `banxico-circular` can resolve this entry. securitySchemes: bearerAuth: type: http scheme: bearer description: 'Use Authorization: Bearer YOUR_API_KEY' ````