A unified API is one API that sits in front of several providers' APIs and presents them through a single, consistent interface. You write one integration, and the unified layer translates your requests into whatever each underlying platform expects.
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Raw platform APIs versus a unified API
Building directly on social platform APIs means a separate OAuth flow, data format, error style, and deprecation calendar for every network, and each one changes on its own schedule. A unified API absorbs that: one auth story, one request shape, normalized responses, and one place that keeps up with platform changes. The tradeoff is that you depend on the unified layer's platform coverage and release pace, so how honestly a provider states what is live matters. InvisibleAPI is a unified API for publishing to social platforms: Instagram and X are live today, with more platforms coming.
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What to look for in one
Three things separate a useful unified API from a thin wrapper: it should manage tokens and reconnects for you, it should report failures with enough detail to act on, and it should say plainly which platforms and capabilities are live rather than listing everything as supported.
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Primary solution What is InvisibleAPI?