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Browse harvested OpenAPI x- extensions

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Browse harvested OpenAPI x- extensions

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Works with AI assistants

Use APIs.io: its APIs.io API lets you browse harvested OpenAPI x- extensions in a single step (GET /extensions). APIs.io also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.

  • Which OpenAPI x- extensions are most common across real specs?
  • Where can I see who publishes a vendor extension and how often it appears?
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  • List OpenAPI specification extensions matching {q}.
  • Rank harvested x- extensions by {sort}.
For your developer

GET /extensions in APIs.io API. Full spec on APIs.io.