Developers

API.

Read-only, no key required. The same published data the site itself renders, as JSON. Every published record here is also citable — see the record page for citation formats.

Base URL

https://www.limitsregistry.com/api/v1

List records

GET /api/v1/limits

Query parameters: category (optional, exact match), page (default 1), pageSize (default 50, max 100).

curl https://www.limitsregistry.com/api/v1/limits?category=Mathematics

{
  "data": [
    {
      "registryNumber": "LR-000072",
      "title": "Chromatic number of the plane",
      "summary": "...",
      "category": "Mathematics",
      "subcategory": "Combinatorics",
      "direction": "MINIMIZE",
      "metricName": "Chromatic number",
      "unit": null,
      "status": "OPEN",
      "publishedAt": "2024-01-01T00:00:00.000Z",
      "url": "https://www.limitsregistry.com/limits/LR-000072"
    }
  ],
  "page": 1,
  "pageSize": 50,
  "total": 1
}

Get a single record

GET /api/v1/limits/{registryNumber}

Includes the current specification, every accepted Claim, and linked evidence. Returns 404 if the record doesn’t exist or isn’t published.

curl https://www.limitsregistry.com/api/v1/limits/LR-000072

List categories

GET /api/v1/categories

Every category with at least one published record.

Other formats

Beyond the JSON API: an embeddable SVG status badge at /api/badge/{registryNumber}, a BibTeX citation per record (see the record page), and RSS feeds for the breakthroughs and watchlist feeds.

Rate limits and caching

No API key and no hard rate limit today — please cache client-side (responses carry Cache-Control, refreshed at most once a minute) rather than polling in a tight loop. This is a best-effort read-only mirror of the public site, not a guaranteed-uptime service; nothing here requires authentication, and nothing here lets you write.