--- title: OpenAPI Overlays for Monetization and Plan Tiering From... description: Maintaining separate API documentation for each pricing tier leads to drift and inconsistency. OpenAPI Overlays solve this by treating one canonical spec as... canonical: https://daily.dev/posts/openapi-overlays-for-monetization-and-plan-tiering-from-one-spec-monjty9mv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: OpenAPI Overlays for Monetization and Plan Tiering From One Spec | daily.dev og:description: Maintaining separate API documentation for each pricing tier leads to drift and inconsistency. OpenAPI Overlays solve this by treating one canonical spec as... og:url: https://daily.dev/posts/openapi-overlays-for-monetization-and-plan-tiering-from-one-spec-monjty9mv og:image: https://api.daily.dev/og/posts/mONJty9MV.png og:image:alt: OpenAPI Overlays for Monetization and Plan Tiering From One Spec og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # OpenAPI Overlays for Monetization and Plan Tiering From One Spec **[API Evangelist](https://daily.dev/sources/apievangelist)** · 4 min read · 0 upvotes · 0 comments ## Summary Maintaining separate API documentation for each pricing tier leads to drift and inconsistency. OpenAPI Overlays solve this by treating one canonical spec as the source of truth and applying per-tier projections. A Free tier overlay removes write endpoints and premium operations entirely, so generated SDKs never expose methods customers cannot use, and rewrites the RateLimit header description with the correct quota and an upgrade nudge. An Enterprise overlay keeps all operations, stamps an x-plan extension, updates rate limit descriptions to negotiated ceilings, and enriches premium endpoints with enterprise-only notes. Critically, overlays only shape documentation and SDK generation — actual enforcement still lives at the API gateway. The recommended approach: one spec, one overlay per tier, regenerated on every build. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I use OpenAPI Overlays to hide endpoints from lower-tier API plans without duplicating my spec? Define one canonical OpenAPI spec and create a separate overlay file per plan tier. In the Free tier overlay, use `remove: true` actions targeting the paths you want to hide (e.g., POST, PUT, DELETE operations). The overlay's `extends` field points to the canonical spec URL, so nothing is copied. Generated SDKs built from the overlay will not include the removed methods, preventing accidental calls to restricted endpoints. _Teams managing multi-tier API products track overlay patterns and tooling updates on daily.dev._ ### Do OpenAPI Overlays enforce API access control or just change documentation? OpenAPI Overlays only shape documentation and SDK generation — they do not enforce access control. Removing an endpoint from a Free tier overlay prevents it from appearing in rendered docs and generated SDKs, but a client can still fire a request to that path. Real enforcement must happen at the API gateway, where the token, plan, and quota are validated and a 403 is returned for unauthorized access. _Developers building API monetization layers find gateway and spec tooling discussions on daily.dev._ ### What does an OpenAPI Overlay file look like for an Enterprise API tier? An Enterprise overlay keeps all operations intact and uses `update` actions to enrich them. It stamps an `x-plan: enterprise` extension on the `info` object for downstream tooling, rewrites the RateLimit header description to the negotiated ceiling (e.g., 50,000 requests per hour with burst headroom), and adds enterprise-only notes to premium operations like bulk cancellation. The `extends` field still points to the single canonical spec. _API platform engineers comparing overlay strategies for tiered products share findings on daily.dev._ ## Similar posts on daily.dev - [The Many Use Cases for OpenAPI Overlays](https://daily.dev/posts/the-many-use-cases-for-openapi-overlays-1gjpvrair) · API Evangelist · 0 upvotes · 0 comments - [OpenAPI Overlays for Separation of Concerns When You Do Not Own the Spec](https://daily.dev/posts/openapi-overlays-for-separation-of-concerns-when-you-do-not-own-the-spec-zhy9th4pq) · API Evangelist · 0 upvotes · 0 comments - [OpenAPI Overlays for Test Fixtures and Mock Generation](https://daily.dev/posts/openapi-overlays-for-test-fixtures-and-mock-generation-exq9pkj6h) · API Evangelist · 0 upvotes · 0 comments - [OpenAPI Overlays for Improving Developer Experience: Enriching a Thin, Code-Generated Spec](https://daily.dev/posts/openapi-overlays-for-improving-developer-experience-enriching-a-thin-code-generated-spec-qiejsxc37) · API Evangelist · 0 upvotes · 0 comments - [OpenAPI Overlays for Adding Tool-Specific Content Without Polluting the Spec](https://daily.dev/posts/openapi-overlays-for-adding-tool-specific-content-without-polluting-the-spec-np7suyu3c) · API Evangelist · 0 upvotes · 0 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#openapi](https://daily.dev/tags/openapi) [View this post on daily.dev](https://daily.dev/posts/openapi-overlays-for-monetization-and-plan-tiering-from-one-spec-monjty9mv) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"OpenAPI Overlays for Monetization and Plan Tiering From One Spec","url":"https://daily.dev/posts/openapi-overlays-for-monetization-and-plan-tiering-from-one-spec-monjty9mv","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/openapi-overlays-for-monetization-and-plan-tiering-from-one-spec-monjty9mv"},"datePublished":"2026-08-08T10:23:32.178Z","dateModified":"2026-08-09T10:24:13.232Z","description":"Maintaining separate API documentation for each pricing tier leads to drift and inconsistency. 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