Live demos

Run any tool from your browser against api.s2ar.dev, ten times a day on each with no key (three on certify), or on your own key, kept in this browser and sent as Authorization: Bearer. Spend the samples and the answer becomes the 402 quote an agent would pay, with the $1 sign-in and the card packs beside it: no dead ends. Every verdict comes back as a signed record you can verify free and share.

• Assert an output — prove the quotation is in the source; schema, terms, lengths; a signed verdict.
• Inspect an x402 endpoint — know what a paid endpoint declares before paying it; eleven checks, a signed record.
• Inspect your own endpoint — get the same probe as a shareable report and a badge; watch it daily.
• Score a text — grade meter, rhyme and lines against the gates of a named form.
• Map a repository — fit a public repo to a token budget; read the quote first, then the answer.
• Audit a reward — grade one of our environments’ rewards for gaming, free once a day; the graded record.
• Play an environment — open a baba or sokoban episode and play it by hand; the last step seals a record.
• Extract the text — the text in an invoice or a screenshot as a plain answer; the engine version beside it.
• Diff two screenshots — find what changed between a golden frame and today’s; same or regression, a signed record.
• Certify an image — compress it, prove a model still reads it, see the input beside the record.
• Verify a record — check any record, by hash or pasted whole, against the published key.

Get a key: a $5 pack shows one after checkout; signing in at api.s2ar.dev/login grants $0.50; an agent pays per call over x402 with no key at all (pay per call).