# Kings Key Eval Exam Endpoint

> Kings Key Eval Exam Endpoint is a paid API for AI agents from kings-key-eval.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-22).

Evaluates or examines submitted text content using an AI model, returning a scored or graded assessment

## Facts

- Endpoint: POST https://kings-key-eval.onrender.com/v1/exam?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kings-key-eval-exam-endpoint-63acbd19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jH3M96cn0YwOP9JWKWt6Y

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 kings-key-eval-exam-endpoint-63acbd19 -d '<json body>'
```

Example prompt: Can you run my essay through the Kings Key exam evaluator and tell me how it scores — here's the text: 'Artificial intelligence is transforming education by enabling personalized learning at scale.' Keep the response within 500 tokens.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call AI evaluation or grading service for text content without standing up your own model infrastructure. It is well-suited for single-shot content assessments, quiz grading, or quality checks where a low per-call cost ($0.05 USDC) is acceptable and you need fast turnaround on short to medium-length text submissions.

## Known failure modes

- Missing 'content' field returns a validation error
- Exceeding token limits may result in truncation or rejection
- Malformed JSON body returns a 400 bad request
- Service unavailable on free-tier render.com cold starts causing timeouts
- Payment failure via x402 protocol results in 402 Payment Required before processing

## Output

Returns an evaluation or graded assessment of the submitted text content, likely including a score, grade, or qualitative feedback on the content, constrained by the max_tokens parameter specified.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "content": {
   "type": "string"
  },
  "max_tokens": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kings-key-eval-exam-endpoint-63acbd19/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kings-key-eval.onrender.com](https://www.zero.xyz/host/kings-key-eval.onrender.com/llms.txt)