Claude Watermark Detector API Status

Is there a public Claude watermark detector API?

Not publicly documented as of August 16, 2026. Anthropic has said detection tools are planned, but WatermarkScope could not verify a generally available statistical-watermark endpoint in the public developer documentation.

Last verified: August 16, 2026 · Evidence may change as Anthropic publishes more details.

01 / CURRENT STATUS

No public integration is claimed here.

WatermarkScope will not present a probability score as an official watermark result unless requests are handled by an authenticated, documented Anthropic detector. A generic writing classifier is not a substitute.

Text watermark mechanismAnnounced

Third-party detector accessNot publicly verified

C2PA browser verificationAvailable now

Last documentation review2026-08-16

02 / INTEGRATION PLAN

What changes when an official API is released.

The site is designed so the current unavailable result can be replaced with an official server-side detector. Any future key will remain in a protected server secret; browser users will never receive it.

03 / SAFETY BOUNDARY

A future result will still need context.

A watermark may indicate that Claude generated or processed text. It would not establish who authored the final document, whether its claims are true, or whether a policy was violated.

No public integration is claimed here.

What changes when an official API is released.

A future result will still need context.

Read the underlying material.