# Services from screwtape.ai on Zero

> screwtape.ai serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/screwtape.ai
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/screwtape.ai/health.json

## Services

- [Screwtape.ai — Judge Agent as a Service](https://www.zero.xyz/c/screwtape-ai-judge-agent-as-a-service-b0ba4d7e/llms.txt): $0.005/call via x402. Evaluates agent output against a task and criteria, returning a pass/fail/retry verdict with a confidence score and reasons.
- [Screwtape.ai — Multi-Agent Consensus Endpoint](https://www.zero.xyz/c/screwtape-ai-multi-agent-consensus-endpoint-698787cf/llms.txt): $0.005/call via x402. Evaluates agreement across multiple agent outputs, returns a consensus answer, agreement score, and false-consensus risk rating (low/medium/high).
- [Screwtape.ai — Judge Agent as a Service (Duplicate Check)](https://www.zero.xyz/c/screwtape-ai-judge-agent-as-a-service-duplicate-check-80fb6728/llms.txt): $0.005/call via x402. Evaluates agent output against a task and criteria to return a pass, fail, or retry verdict with a score and reasons, including duplicate detection.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)