Xyntherium Verify

Check whether an AI answer is supported by the sources you gave it.

Verify splits the answer into claims and checks each one against your passages. We don’t vote. We verify spans: a claim counts as supported only when code finds the quoted text in your source and every condition the source attaches is still in the claim.

QuestionAI answer

Source passages (text only)

Free demo: text only, up to 5 passages. Pasted text and results are deleted after a day unless you share them.

API docs →One POST, a release recommendation, and the evidence for every claim.The open benchmark →How often each method releases an answer its sources do not support, with intervals.Get an API key →1,000 checks a month free. No card.