Research

License URL catalog (26,945 entries)

Changed on

Return the aggregated license-URL catalog - the distinct set of license URLs that publishers have deposited across the Crossref corpus. Each entry carries the URL and the count of works depositing that exact URL. Useful for analytics of open-access licensing distribution. Values vary in casing and normalisation because Crossref preserves publisher-supplied strings. The catalog shifts slowly; Sugra caches for 7 days. Data licensed CC0 by Crossref.

get/api/v1/research/crossref/license-catalog

Request

  • Base URL: https://sugra.ai
  • URL: https://sugra.ai/api/v1/research/crossref/license-catalog
  • Auth: API key in header x-api-key

Query parameters

limitinteger

Items per page (1 to 1000).

offsetinteger

Zero-based offset into the catalog.

Response

License URL entries with work counts, plus pagination block.

Example response

{
  "meta": {
    "endpoint": "/api/v1/fred/us/cpi",
    "data_time": "2026-04-16T14:30:00Z",
    "response_time": "2026-04-16T14:30:12Z",
    "provider": "Sugra API v1.0.1",
    "data_age_days": 8.532,
    "source": "sugra_crypto",
    "attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
    "fallback_chain": [
      "sugra_crypto",
      "sugra_finance"
    ],
    "stale_since": "2026-09-08T12:00:00Z",
    "period": "2026-Q1",
    "notes": "the UKMTO report behind these counts is dated 2026-08-21 and is 11 days old"
  }
}

Changes