> ## 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 Circular > One Banco de México circular in full, by its `number`: subject, obligated entities, the consolidated (compiled) text PDF, the original text PDF with its DOF date, and every modification with dates and PDFs. Amendment circulars have no page of their own: looking one up returns the amended base circular (its `number` says which), whose modifications list carries the requested número. ## OpenAPI ````yaml /api-reference/openapi.json post /mx/banxico/circular/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/circular/v1: post: tags: - Mexico - Banco de México summary: Banxico Circular description: >- One Banco de México circular in full, by its `number`: subject, obligated entities, the consolidated (compiled) text PDF, the original text PDF with its DOF date, and every modification with dates and PDFs. Amendment circulars have no page of their own: looking one up returns the amended base circular (its `number` says which), whose modifications list carries the requested número. operationId: banxico_circular requestBody: required: true content: application/json: schema: type: object required: - number properties: number: type: string minLength: 1 maxLength: 80 description: >- Circular number as listed (e.g. `3/2012`, `E-126/2013`). Matching is case-insensitive. additionalProperties: false example: number: 3/2012 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/BanxicoCircularResponse' '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: BanxicoCircularResponse: type: object required: - data properties: data: type: object required: - found - number - circular properties: found: type: boolean number: type: string circular: oneOf: - $ref: '#/components/schemas/BanxicoCircular' - type: 'null' 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. BanxicoCircular: type: object required: - number - abrogated - title - subject - obligated_subjects - compiled_pdf_url - original_pdf_url - original_dof_date - comparison_pdf_url - abrogated_by - modifications - official_url properties: number: type: string abrogated: type: boolean title: type: - string - 'null' subject: type: - string - 'null' obligated_subjects: type: array items: type: string compiled_pdf_url: type: - string - 'null' format: uri description: Current consolidated text (all modifications applied). original_pdf_url: type: - string - 'null' format: uri original_dof_date: type: - string - 'null' format: date comparison_pdf_url: type: - string - 'null' format: uri description: Consolidated comparison of every modification, when offered. abrogated_by: oneOf: - type: object required: - text - circular_number - url properties: text: type: string circular_number: type: - string - 'null' url: type: - string - 'null' format: uri - type: 'null' description: The abrogating instrument; null while the circular is in force. modifications: type: array items: type: object required: - circular_number - dof_date - pdf_url - description properties: circular_number: type: - string - 'null' dof_date: type: - string - 'null' format: date pdf_url: type: - string - 'null' format: uri description: type: string official_url: type: string format: uri securitySchemes: bearerAuth: type: http scheme: bearer description: 'Use Authorization: Bearer YOUR_API_KEY' ````