CNSF

The rules Mexican insurers and sureties actually have to comply with, in force and in full: the Ley de Instituciones de Seguros y de Fianzas (the law) and the Circular Única de Seguros y de Fianzas (the circular that implements it, with its annexes). Search across both at once, or pull one artículo, disposición or anexo by its number. A second endpoint tracks every Circular Modificatoria since 2014: what changed, and the Diario Oficial publication behind it.

The whole source, organized and ready to query: every endpoint on this page answers in milliseconds. Every response carries as_of: how current the data is. How datasets work.

Search provisions

POST /mx/cnsf/provisions-search/v1 Dataset One search across the law and the circular at once, which the commission’s own site does not offer.

Field	Type	Notes
`query`	string	Optional words to match in the text of the provision and in its chapter and título names.
`instrument`	enum	`LISF` for the law, `CUSF` for the circular, or `any` for both. Default `any`.
`kind`	enum	`articulo` (LISF), `disposicion` or `anexo` (CUSF), or `any`. Default `any`.
`number`	string	Optional exact number as the instrument writes it: `41`, `3.1.2`, `14.2.1-a`.
`chapter_number`	string	Optional chapter, e.g. `6.3`. Annexes hang off a chapter rather than sitting in one and carry no chapter number.
`source_circular`	string	Optional, for transitional provisions: the Circular Modificatoria that introduced them (e.g. `3/2026`), or `original` for those issued with the instrument itself.
`amended_from`	string	Optional: only provisions whose chapter was amended on or after this date, `yyyy-mm-dd`.
`amended_to`	string	Optional: only provisions whose chapter was amended on or before this date, `yyyy-mm-dd`.
`page`	integer	1-based page number. Default `1`.
`per_page`	integer	Results per page (1-25). Every result carries the full text. Default `10`.

curl https://api.croma.run/mx/cnsf/provisions-search/v1 \
  -H "Authorization: Bearer $CROMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "query": "requerimiento de capital", "instrument": "CUSF" }'

Returns as_of (how current the data is), the applied filters, total (matches across every page), page, per_page, total_pages, count and results[] in reading order. Every result carries id, instrument (LISF or CUSF), kind, number as the instrument writes it, title_number and title_name, chapter_number and chapter_name, heading (the official title, on annexes and referenced documents), text (the full provision, fracciones and incisos included), source_circular (on transitional provisions, the Circular Modificatoria that introduced them), external_url (on referenced documents), amendment_note and last_amended_at, position (reading order within the instrument) and official_url. kind is one of articulo (LISF), disposicion, anexo, anexo_transitorio or documento (CUSF), transitoria (either), or capitulo for a chapter repealed in full, which carries the repeal notice and no numbered provisions.

Both instruments in full, up to date and ready to query. last_amended_at is null on a provision whose chapter the source flags as never amended, which means it has stood unchanged since the instrument was issued.

One provision

POST /mx/cnsf/provision/v1 Dataset

Field	Type	Notes
`provision_id`	string	Required. The `id` of a provision from the search results.

curl https://api.croma.run/mx/cnsf/provision/v1 \
  -H "Authorization: Bearer $CROMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "provision_id": "cusf:disp:3.1.2" }'

Returns as_of, found, provision_id and provision. Every result carries id, instrument (LISF or CUSF), kind, number as the instrument writes it, title_number and title_name, chapter_number and chapter_name, heading (the official title, on annexes and referenced documents), text (the full provision, fracciones and incisos included), source_circular (on transitional provisions, the Circular Modificatoria that introduced them), external_url (on referenced documents), amendment_note and last_amended_at, position (reading order within the instrument) and official_url. kind is one of articulo (LISF), disposicion, anexo, anexo_transitorio or documento (CUSF), transitoria (either), or capitulo for a chapter repealed in full, which carries the repeal notice and no numbered provisions.

Amendments

POST /mx/cnsf/amendments/v1 Dataset What changed in the circular, when, and where to read the official publication.

Field	Type	Notes
`query`	string	Optional words to match in the amendment’s title and in what it describes changing.
`chapter_number`	string	Optional: only amendments that touched this chapter, e.g. `6.3`.
`published_from`	string	Optional earliest publication date, `yyyy-mm-dd`. Amendments with no stated date never match a window.
`published_to`	string	Optional latest publication date, `yyyy-mm-dd`.
`page`	integer	1-based page number. Default `1`.
`per_page`	integer	Results per page (1-25). Default `10`.

curl https://api.croma.run/mx/cnsf/amendments/v1 \
  -H "Authorization: Bearer $CROMA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "chapter_number": "6.3" }'

Returns as_of, the applied filters, total, page, per_page, total_pages, count and results[], most recent first. Each amendment carries title (CIRCULAR Modificatoria 3/26), circular_number, published_at, dof_document_id and dof_url (the gazette publication behind it), changes[] (what it did, as the commission describes it), affected_chapters[], affected_annexes[] and affected_urls[].

published_at is null on amendments where the commission does not state the exact date. It is never guessed from the year in the circular’s number, which disagrees with the gazette on roughly one amendment in ten.

Full reference

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One provision

Amendments

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​Search provisions

​One provision

​Amendments

Full reference

Search provisions

One provision

Amendments