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AnnexAPI

Sends each model request to the cheapest healthy upstream provider that serves that model, through one API endpoint.
HealthUsage-based pricingJust launched · watched until Jan 20, 2027
annexapi.com ↗Launched on Product Hunt · Sep 19, 2026
Open annexapi.comAlternativesSet it up for my teamIs AnnexAPI yours? Claim the card →
At a glanceswept Oct 19, 2026

1.9k linking domains

Established

For
Developers who want to call frontier AI models from several providers through one API endpoint.
Runs as
API
Used for
  • call models from several providers through one endpoint
  • cut token costs on requests with long cached prompts
  • keep requests running when a provider's health degrades
Worth knowingcomputed from what we read · each with its source
  • Launched on Product Hunt on Sep 19, 2026Product Hunt ↗
Most used in Healthby use, among tools still maintained — this tool shares no tags yet

Figure and bar: visits/mo, estimate · year: online since

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Questions this page answers
  • What is AnnexAPI?

    Sends each model request to the cheapest healthy upstream provider that serves that model, through one API endpoint. It is listed in the Atlas under Health.

  • Who is AnnexAPI for?

    Developers who want to call frontier AI models from several providers through one API endpoint.

  • Do people use AnnexAPI?

    Established.

How we read a tool

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  • Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
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  • The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

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