WorldCat · Rate Limits

Worldcat Rate Limits

OCLC WorldCat APIs enforce usage caps designed to meet typical member requirements while preserving network resources for all users. Rate limits vary by API and are applied on a rolling 24-hour window basis. Organizations with higher volume needs can request increased limits by contacting OCLC developer support with their WSKey and use case details.

Worldcat Rate Limits is the machine-readable rate-limit profile for WorldCat on the APIs.io network, in the API Commons Rate Limits shape.

It captures 4 rate-limit definitions.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

Tagged areas include Library, Bibliographic Records, WorldCat, OCLC, and Cataloging.

4 Limits
Method: generated, dated 2026-06-13.
Written by API Evangelist on 2026-06-13 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
LibraryBibliographic RecordsWorldCatOCLCCatalogingMetadataDiscoveryBooksMediaLinked Data

Limits

· per rolling 24-hour
Rolling 24-hour limit of 50,000 requests applies to the WorldCat Search API. This is consistent with the v1 limit before v1 was deprecated at end of 2024. Libraries needing higher limits should contact OCLC support.
· per per day
Production access is limited to 50,000 requests per day. The API supports both OpenURL requests for matching citations and REST requests for browsing and searching subscription resources.
· per per day
Specific rate limit figures are not published for the Metadata API. OCLC establishes usage caps in line with typical library cataloging workflows. Contact OCLC developer support for current limits.
· per per day
Specific rate limit figures are not published for the Entities Data API. Access is limited to OCLC Meridian subscribers. Contact OCLC developer support for current limits applicable to your subscription.

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

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Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/worldcat-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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