Is this Claude API relay authentic?

Clodex checks Claude through Anthropic thinking signatures plus additional detectors. Free, no signup, no API-key retention.

Relay URL

Relay root URL. Clodex will send test requests to /v1/messages.

API key

Used only for this check; not written to reports, logs, or disk.

Target model

Pick from the list or type a custom relay model name.

Check depth

Long-context check Extra 32k -> 100k -> 200k probes. This can cost more and is paid by your API key.

Extreme context Tests closer to the model advertised limit. Can be expensive for large models.

Anthropic server-side signature is the strongest Claude authenticity signal.

Checks message IDs, tool use, stream/non-stream consistency, and usage.

After the check you get a permanent HTML URL and JPG report.

FAQ

What is thinking signature?

It is like an Anthropic server stamp on Claude thinking blocks. A relay should not be able to create it by itself.

The detector checks signature presence, shape, and length in extended/adaptive thinking responses and treats it as a key signal.

Does Clodex store my API key?

No. The key is used during the job and then removed from memory. Reports keep only a masked form.

The key is not serialized into report JSON and should not reach persistent storage. This can be audited in the open code.