# QA Judge

> QA Judge is a paid API for AI agents from attester.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Evaluates and judges the quality of question-answer pairs or AI outputs, returning a quality assessment score or verdict.

## Facts

- Endpoint: POST https://attester.dev/judge
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/qa-judge-e58d9cae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lf4fteEmFl2rQbfQWzRX3

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability qa-judge-e58d9cae -d '<json body>'
```

Example prompt: Can you judge the quality of this QA pair — the question is 'What is the boiling point of water?' and the answer given is 'Water boils at 100 degrees Celsius at sea level' — is this a good, accurate answer?

## When to prefer this

Choose this endpoint when you need an automated, paid quality assessment of question-answer pairs or AI-generated responses — particularly useful for LLM evaluation pipelines, benchmarking, or filtering low-quality outputs before storing or presenting them.

## Known failure modes

- Missing or malformed question/answer input returns 400 error
- Payment not included or insufficient results in 402 Payment Required
- Service unavailable returns 5xx error
- Ambiguous or very short inputs may return low-confidence judgments

## How this service works

QA Judge: grade an agent output against your rubric (structure, citations, claim support, length constraints) and receive a 0-100 score with a signed attestation. $0.10 USDC per grading.

## Output

Returns a quality judgment or verdict for the submitted QA pair, likely including a score or pass/fail classification indicating whether the answer adequately and accurately addresses the question.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/qa-judge-e58d9cae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from attester.dev](https://www.zero.xyz/host/attester.dev/llms.txt)