Changelog

A new endpoint answers whether a clip carries a Speechify watermark without any credential. POST /v1/audio/watermark/verify takes the same audio upload as POST /v1/audio/watermark/detect and returns a bare {"watermarked": true|false} — no key, no session, nothing to authenticate.

It is the API half of the public tool at speechify.ai/detect, and it exists because California’s AI Transparency Act (BPC 22757.2) requires a detection tool that is publicly accessible and invokable without visiting a website.

verify answers; detect measures. The new verb deliberately omits the confidence score its sibling returns — a public score is a gradient to optimise against. Keep using POST /v1/audio/watermark/detect with an API key when you want the score.

Because verify takes no credential, it is rate-limited per client address and draws on a shared platform budget, so expect 429 under sustained automated use. Nothing changes for an existing integration: POST /v1/audio/watermark/detect’s path, request and response are untouched.