> ## 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. # SII Circulars Search > Search the circulares of Chile's Servicio de Impuestos Internos from 1975 on: its instructions on how the tax laws apply, from the monthly tables of readjustments and the Unidad de Fomento to the rules implementing each tax reform. Free text matches the title, SII's summary and the full text. Filter by `number`, `year` and the circular's date (`from_date`/`to_date`). Each result carries Croma's copy of the circular's documents. Served by Croma (`as_of` says how current the data is). **Dataset endpoint**: answers from the whole source in milliseconds and carries `as_of`. ## OpenAPI ````yaml /api-reference/openapi.json post /cl/sii/circulars-search/v1 openapi: 3.1.0 info: title: Croma Marketplace API version: 1.0.0 description: >- Government-data APIs for Colombia, Peru, Mexico, United States, Brazil, El Salvador, Bolivia, Japan, and Chile, plus global web search. Croma normalizes public-sector data into structured JSON for product teams and AI agents. Every operation is a POST with a JSON body and an organization API key as a bearer token; every operation is an idempotent lookup and accepts an optional `Idempotency-Key` header. Paths carry their major version (`/v1`); the versioning and deprecation policy, including the `Deprecation` and `Sunset` headers a retiring endpoint sends, is at https://docs.usecroma.com/versioning. Rate limits are per organization and reported on every response (`RateLimit-Policy`, `X-RateLimit-*`): https://docs.usecroma.com/rate-limits. termsOfService: https://usecroma.com/en/terms contact: name: Croma support url: https://usecroma.com/en/support email: support@usecroma.com servers: - url: https://api.croma.run security: [] paths: /cl/sii/circulars-search/v1: post: tags: - Chile - Servicio de Impuestos Internos (SII) summary: SII Circulars Search description: >- Search the circulares of Chile's Servicio de Impuestos Internos from 1975 on: its instructions on how the tax laws apply, from the monthly tables of readjustments and the Unidad de Fomento to the rules implementing each tax reform. Free text matches the title, SII's summary and the full text. Filter by `number`, `year` and the circular's date (`from_date`/`to_date`). Each result carries Croma's copy of the circular's documents. Served by Croma (`as_of` says how current the data is). **Dataset endpoint**: answers from the whole source in milliseconds and carries `as_of`. operationId: sii_circulars_search parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: true content: application/json: schema: type: object required: [] properties: query: type: string maxLength: 300 default: '' description: >- Optional search terms matched against the summary, the cited norms and the full text. number: type: string maxLength: 20 default: '' description: >- Optional document number, e.g. `2815`. Dots and leading zeros are ignored. Numbers restart every year, so combine it with `year`. year: type: integer minimum: 0 maximum: 2100 default: 0 description: >- Optional year the document belongs to. 0 searches every year. from_date: type: string format: date default: '' description: Optional date filter in yyyy-mm-dd format. to_date: type: string format: date default: '' description: Optional date filter in yyyy-mm-dd format. page: type: integer minimum: 1 maximum: 1000 default: 1 description: 1-based page number for paginated results. per_page: type: integer minimum: 1 maximum: 50 default: 20 description: Results per page (1-50). additionalProperties: false example: query: unidad de fomento year: 2026 responses: '200': description: Successful response headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' X-Cache: $ref: '#/components/headers/X-Cache' content: application/json: schema: $ref: '#/components/schemas/SiiCircularsSearchResponse' '400': description: Invalid request body headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' content: application/json: schema: $ref: '#/components/schemas/ApiError' '401': description: Missing or invalid API key headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' content: application/json: schema: $ref: '#/components/schemas/ApiError' '429': description: Rate limit exceeded headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' Retry-After: $ref: '#/components/headers/Retry-After' content: application/json: schema: $ref: '#/components/schemas/ApiError' '500': description: Internal error headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' content: application/json: schema: $ref: '#/components/schemas/ApiError' '502': description: Upstream source returned an error headers: X-Request-Id: $ref: '#/components/headers/X-Request-Id' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Idempotency-Key: $ref: '#/components/headers/Idempotency-Key' Deprecation: $ref: '#/components/headers/Deprecation' Sunset: $ref: '#/components/headers/Sunset' content: application/json: schema: $ref: '#/components/schemas/ApiError' security: - bearerAuth: [] externalDocs: description: Interactive documentation and examples url: https://docs.usecroma.com/guides/chile/sii components: parameters: IdempotencyKey: name: Idempotency-Key in: header required: false description: >- Optional client-chosen key for this request (any string up to 255 characters, e.g. a UUID). Every Croma operation is an idempotent lookup: repeating a request with the same body returns the same result and creates nothing, so retrying after a timeout or network failure is always safe. The key is echoed back in the `Idempotency-Key` response header so you can correlate a retry with its first attempt. Each attempt that reaches the API counts against the rate limit. schema: type: string maxLength: 255 example: 0f8e9a42-6b7c-4d1e-9a3f-2c5d7e8f9a0b headers: X-Request-Id: description: Unique id for the request (req_…). Include it in support reports. schema: type: string RateLimit-Policy: description: >- Quota policy for this endpoint as an IETF RateLimit-Policy structured field, e.g. `"default";q=100;w=86400` (100 requests per 86400-second window per organization). Endpoints with an extra hourly ceiling list both policies, e.g. `"webSearch";q=100;w=3600, "default";q=100;w=86400`. Present on every response, including 401 and 429. schema: type: string example: '"default";q=100;w=86400' Idempotency-Key: description: >- The `Idempotency-Key` the request carried, echoed back unchanged. Absent when the request sent none. schema: type: string Deprecation: description: >- Present only on an endpoint version scheduled for removal: the date the deprecation took effect (RFC 9745). A `Sunset` header and a `Link` with `rel="successor-version"` accompany it. Policy: https://docs.usecroma.com/versioning schema: type: string example: '@1767225600' Sunset: description: >- Present only on an endpoint version scheduled for removal: the date after which it answers 410 (RFC 8594). Announced in the changelog at least 90 days ahead. schema: type: string format: date-time example: Wed, 01 Apr 2026 00:00:00 GMT 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 spend no credits, but still count toward an hourly ceiling. schema: type: string enum: - HIT - MISS Retry-After: description: Seconds to wait before retrying. schema: type: integer schemas: SiiCircularsSearchResponse: type: object required: - data properties: data: $ref: '#/components/schemas/SiiCircularsSearchData' 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. SiiCircularsSearchData: type: object properties: as_of: anyOf: - type: string - type: 'null' description: How current the data in this response is. query: type: string number: anyOf: - type: string - type: 'null' year: anyOf: - type: number - type: 'null' from_date: anyOf: - type: string - type: 'null' to_date: anyOf: - type: string - type: 'null' total: type: number description: Matches, counted up to 1000. total_is_exact: type: boolean description: >- False when more than 1000 match: `total` is then 1000, and the pages go on. page: type: number per_page: type: number total_pages: type: number description: Pages over `total`; there are more when `total_is_exact` is false. count: type: number results: type: array items: type: object properties: id: type: string description: The act's year and number, e.g. `2026-41`. number: type: string description: The act's number, e.g. `41`. Numbers restart every year. year: type: number description: The year SII files the act under. title: type: string description: >- The act as SII titles it, e.g. "Circular N° 41 del 15 de Octubre del 2026". issued_at: anyOf: - type: string - type: 'null' description: '`yyyy-mm-dd` the act was issued.' summary: anyOf: - type: string - type: 'null' description: SII's summary of what the act does. issuing_office: anyOf: - type: string - type: 'null' description: >- The office SII names as the act's source ("Fuente"), e.g. "Subdirección Normativa". status: anyOf: - type: string - type: 'null' description: >- The note SII prints beside the act, e.g. "modificada" or "dejada sin efecto". Null when it prints none. text_status: type: string enum: - ok - scanned - missing description: >- `ok` when the full text is here; `scanned` when the document is an image with no text in it; `missing` when SII publishes no readable document. official_url: type: string description: The year's listing on SII's site. document_url: anyOf: - type: string - type: 'null' description: >- Croma's copy of the act's main document, byte for byte as SII published it. source_document_url: anyOf: - type: string - type: 'null' description: The act's main document on SII's own site. documents: type: array items: type: object properties: name: type: string description: The file name as SII published it. format: type: string description: >- The file's format from its name: `pdf`, `htm`, `doc`, `zip`, ... document_url: anyOf: - type: string - type: 'null' description: >- Croma's copy of the file, byte for byte as SII published it. Null when SII no longer serves it. source_document_url: type: string description: The file on SII's own site. bytes: anyOf: - type: number - type: 'null' description: Size of the file in bytes, when the copy was made. required: - name - format - document_url - source_document_url - bytes description: >- Every file SII publishes with the act: its text, the Word copy, annexes. required: - id - number - year - title - issued_at - summary - issuing_office - status - text_status - official_url - document_url - source_document_url - documents required: - as_of - query - number - year - from_date - to_date - total - total_is_exact - page - per_page - total_pages - count - results securitySchemes: bearerAuth: type: http scheme: bearer description: 'Use Authorization: Bearer YOUR_API_KEY' ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.