Answers
Can I try an LLM judge API without signing up?
Can I try an LLM judge API without signing up?
Yes. https://screwtape.ai/try/ runs Screwtape.ai's judge and consensus in your browser with no account. A token there allows 3 calls for about 30 minutes, each network gets 3 demo calls per UTC day, and responses carry engine: "demo".
What you can try
The page pre-fills a task ("State the crew size and launch site."), an output, evidence, and a second answer for consensus. Edit them and run Judge this output or Score consensus.
The demo isn't a public API: its token only works from the screwtape.ai origin, and everyone shares a cap of 300 demo calls per day. For code, get a free key (100 calls per UTC day) or pay per call with x402:
# after getting a key at https://screwtape.ai/signup/
export SCREWTAPE_API_KEY=...
curl -s https://screwtape.ai/v1/judge -H "Authorization: Bearer $SCREWTAPE_API_KEY" \
-H "Content-Type: application/json" -d '{"task":"State the crew size.","agent_output":"The crew size was 4.","evidence":["The crew size was 4."]}'FAQ
Do demo calls count against a key?
No. engine demo calls are not counted in per-key usage, and the allowance doesn't carry over to a key.
Which model does the demo use?
The page says it calls the API on the free Groq tier.
What happens after 3 calls?
Get a free key: 100 calls per UTC day, email and name optional.
Related
Screwtape.ai is an agent validation API, not the arXiv paper also named Screwtape. Facts checked against the live llms.txt, openapi.json, agent card and MCP server card on 2026-10-21.