> ## Documentation Index > Fetch the complete documentation index at: https://vaquill.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Law change alert > Sent to a watch's `webhookUrl` when its board refreshes with real changes, naming the sections that changed. Headers: `Content-Type: application/json`, `X-Vaquill-Event: board.updated`. **Verification.** Present only when the watch has a `webhookSecret`. Prefer the Standard Webhooks headers: `webhook-id`, `webhook-timestamp` (Unix seconds) and `webhook-signature` (`v1,`, several space separated while a secret rotates), an HMAC-SHA256 over `{webhook-id}.{webhook-timestamp}.{raw body}`. The HMAC key is the base64 decoding of the secret after `whsec_` when it has that prefix, otherwise the secret's UTF-8 bytes. Verify against the raw bytes before parsing, and reject a timestamp more than 5 minutes old. `webhook-id` is stable across retries of one delivery. The legacy `X-Vaquill-Signature: sha256=` header (HMAC-SHA256 of the raw body) is also sent, is deprecated, and remains for at least 12 months. Respond with any 2xx to acknowledge; redirects are not followed. ## OpenAPI ````yaml https://api.vaquill.ai/external/openapi.json webhook board.updated openapi: 3.1.0 info: title: Vaquill Developer API description: >- Public API for legal statutes and legislation. **Authentication**: Pass your API key as `Authorization: Bearer vq_key_...` (preferred) or in the `X-API-Key` header. Sending two different keys in one request is rejected with a 401. **Credits**: Each call costs API credits. See `GET /api/v1/api-credits/pricing` for the full pricing matrix. ## Jurisdictions | Jurisdiction | Coverage | `countryCode` | |---|---|---| | **United States** | USC and the Statutes at Large, the CFR and its annual editions, all 56 state and territory statutory codes (50 states, DC and five territories), state administrative regulations, court rules, federal and state constitutions, federal agency guidance and adjudications, the Federal Register, the Sentencing Guidelines and US tax treaties. | `US` | See the full [Coverage page](https://www.vaquill.ai/docs/api-guide/coverage) for the jurisdiction-by-jurisdiction breakdown, or call `/us/statutes/coverage` for live counts. Coverage is per (jurisdiction, corpusType) pair, so treat that endpoint as the authoritative list rather than this summary. ## Endpoints - **US Statutes**: Search and retrieve any of the corpora above with full text, resolve a citation to its exact section, browse the statutory hierarchy, read a section as it stood on a past date, and follow its change history, cross-references and defined terms - **Board Watches**: Subscribe to a corpus source and get a webhook or email when it refreshes with real changes (free, API key required) - **Pricing**: Credit costs per endpoint (no auth required) ## Rate limits Limits are enforced per API key and scale with your plan. A `429` response includes a `Retry-After` header. | Plan | Per minute | Per hour | Per day | |---|---|---|---| | Vaquill API Pro | 60 | 1,000 | 2,000 | | Vaquill API Business | 150 | 2,500 | 10,000 | For full documentation, visit the [API Reference](https://www.vaquill.ai/docs/api-reference/). version: 1.0.0+a1f3e4af5900e02d contact: name: Vaquill API Support url: https://www.vaquill.ai email: support@vaquill.ai license: name: Proprietary url: https://www.vaquill.ai/terms termsOfService: https://www.vaquill.ai/terms x-revision: a1f3e4af5900e02d servers: - url: https://api.vaquill.ai description: Production security: - ApiKeyAuth: [] - ApiKeyHeader: [] tags: - name: US Statutes description: >- Search and retrieve US primary law. Covers the United States Code and the Statutes at Large, the Code of Federal Regulations and its annual editions, state statutory codes and administrative regulations, federal and state constitutions, court rules, Federal Register rules and Presidential documents, federal and state agency guidance, agency adjudications, state Attorney General opinions, the Sentencing Guidelines and US tax treaties. Scope a search with the `corpusType` filter, and call `/us/statutes/coverage` for the live jurisdiction-by-corpusType list. - **Search**: Search across all USC, CFR, state, and regulatory sections - **Section**: Get metadata, citation, hierarchy, and source links for a specific section - **Body**: Get the full text of a section - **Enactments**: Which state session laws a publisher's own tables list against a section (supported jurisdictions only, never a complete history) - name: US Session Laws description: >- State session laws: the acts of each legislature as they were enacted, chapter by chapter, before they are folded into a code. A session law is what the governor signs. It carries the act's own text, including the language it strikes and inserts, its approval and effective dates, and, where the publisher prints one, the code sections it changes. That makes it the source for "which act changed this section, and when did it take effect". Every act has a permanent `sessionLawId` (for example `SSL_MN_2025R_G_Y2025_C1`, Minnesota Laws 2025, regular session, chapter 1) whether or not we hold its text, and a citation or bill number such as `S.F.No. 1552` is accepted where an id goes. v1 serves STATE acts only. Federal session laws (the Statutes at Large, `SAL_` ids) are served by `/us/statutes/section`, and `/us/statutes/resolve` points a session-law citation here. **Start here**: check `/us/statutes/coverage` (free) for what we hold per state: each jurisdiction's `sessionLaws` block lists its sessions, which are complete or only partly collected, and the `series` and `instrumentTypes` that exist. Then **List** a session or a date range to get ids, **Get** one act for its record, then **Body** for its text. A law missing from a partly collected session is a free 404 (`session_not_fully_collected`), not proof it does not exist. - **List**: everything enacted in a state's session, approved in a window, or taking effect on a date - **Get**: one act by id or by citation; dates (`effectiveDates` is always a list), sources and the code sections it affects - **Body**: the act's text as printed, paged by cursor, with amendatory markup preserved where the publisher printed it - **Batch**: up to 50 ids or citations in one call, the same record as Get, billed per law served, with every miss listed and its reason - **Changes**: a sync feed of the registry over an integer cursor (`sinceId`): what began to be served, was corrected, withdrawn or merged The reverse link, from a code section to the acts a publisher's own tables list against it, is `GET /us/statutes/section/{actId}/enactments`. - name: US Rulemaking description: >- How a federal rule is made, as public records tied together by its Regulation Identifier Number (RIN): the semiannual Unified Agenda (every edition from Fall 1995), the OIRA review under Executive Order 12866, the Regulations.gov docket and its documents, and the Federal Register documents that proposed and finalised it. **Start here**: `GET /us/rulemaking/coverage` (free) lists what is held per source and whether each is fresh. Then **By RIN** for everything held for one rule, **Agenda history** for how its timetable moved edition by edition, or **Dockets** and **Documents** for the Regulations.gov side. Every link between sources carries its `basis` and `quality` (`verified`, `candidate`, `ambiguous`). A link we could not make with confidence is marked, never guessed, and an umbrella RIN shared by unrelated rules claims no proposal-to-final pairing. A comment count of `null` means not measured, never zero. Comment text, attachments and commenter information are not held or served. - name: Board Watches description: >- Law-change alerts. Subscribe to a **board** (a tracked corpus source, identified by `corpusType` plus an optional `state`) and get a webhook or email whenever it refreshes with real changes, naming the exact sections that changed. Fetch old-vs-new text for any amended section via the change diff. Boards refresh on their own existing cadence; watching one does not change how often it refreshes. Every endpoint here is **free**: authenticated by API key and rate-limited, but not credit-metered. See the [Law Change Alerts guide](https://www.vaquill.ai/docs/api-guide/alerts) for the full walkthrough. - name: Pricing description: >- Credit pricing and conversion rates. No authentication required. 1 credit = $0.01 USD. - name: Agent Onboarding description: >- How an AI agent gets an API key for its human, with no copy and paste. Free and keyless. The agent starts a signup, the human approves a short code while signed in, and the agent collects an ordinary API key. Full walkthrough: https://api.vaquill.ai/auth.md - name: Credits description: >- Your own credit balance: what is spendable right now, where it came from, and what is about to expire. Free and never charged, so it is safe to poll for low-balance alerting or to pre-flight a batch job. externalDocs: description: Full API Reference url: https://www.vaquill.ai/docs/api-reference/ paths: {} components: securitySchemes: ApiKeyAuth: type: http scheme: bearer bearerFormat: vq_key_* description: >- API key issued from the developer dashboard. Pass as `Authorization: Bearer vq_key_...` (preferred). ApiKeyHeader: type: apiKey in: header name: X-API-Key description: >- The same API key as a bare header value: `X-API-Key: vq_key_...`. Equivalent to the Bearer form. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.