# x402.shizu.me /ask-pro — Claude Sonnet LLM Completion

> x402.shizu.me /ask-pro — Claude Sonnet LLM Completion is a paid API for AI agents from x402.shizu.me, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-01).

Runs a user prompt through Claude Sonnet (a capable reasoning model) and returns a text completion, stateless and pay-per-call via x402.

## Facts

- Endpoint: POST https://x402.shizu.me/ask-pro?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-shizu-me-ask-pro-claude-sonnet-llm-completion-2eb5a299
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y1eu7BAv-21_WBUid-i5k

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 x402-shizu-me-ask-pro-claude-sonnet-llm-completion-2eb5a299 -d '<json body>'
```

Example prompt: Using the smarter Claude Sonnet model, analyze the following contract clause and explain what risks it poses to a small business owner: 'The licensor reserves the right to revoke access at any time without notice or refund.'

## When to prefer this

Choose /ask-pro over the basic /ask endpoint when the task requires stronger reasoning, nuanced writing, or careful multi-step analysis and the $0.05 per-call price is acceptable. Prefer this over setting up a direct Anthropic API key when you want zero-signup, pay-per-call access to Claude Sonnet without managing credentials or billing. Not ideal for high-volume cheap completions where the basic /ask model suffices.

## Known failure modes

- prompt exceeds 5000 UTF-8 bytes — request rejected
- max_tokens set above 512 — request rejected or clamped
- malformed JSON body missing required prompt field — 400 error
- payment not included or insufficient — 402 Payment Required
- model unavailable or upstream timeout — 5xx error

## How this service works

Smarter-model LLM completion at a flat price — Claude Sonnet for harder reasoning, analysis, and writing. Same simple contract as /ask: body {prompt (required), system?, max_tokens? (<=512), temperature?}; prompt up to 5000 utf-8 bytes. Stateless; prompts never logged. Returns {model, text, stop_reason, usage}.

## Output

Returns a JSON object with: model (the model identifier used, e.g. claude-sonnet), text (the generated completion string), stop_reason (why generation stopped, e.g. end_turn or max_tokens), and usage (token counts for prompt and completion).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {},
  "max_tokens": {}
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "Fixed pricing trades cost efficiency for predictability...",
  "model": "claude-sonnet-5",
  "usage": {
   "input_tokens": 18,
   "output_tokens": 312
  },
  "stop_reason": "end_turn"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-shizu-me-ask-pro-claude-sonnet-llm-completion-2eb5a299/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.shizu.me](https://www.zero.xyz/host/x402.shizu.me/llms.txt)