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x402.shizu.me /ask-pro — Claude Sonnet LLM Completion
x402
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.
Price / call$0.05
Success—
StatusUnknown
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).
Example use cases
Complex legal clause analysis
“I need a thorough analysis of this clause from a software agreement — use the more powerful reasoning model: 'Vendor may collect anonymized usage data and share it with third-party analytics partners.' What are the privacy implications and what should I push back on?”
Hard technical writing task
“Write a clear, detailed explanation of how Byzantine fault tolerance works in distributed systems — I want something accurate enough for an engineering audience, so use the stronger model for this one.”
Multi-step business reasoning
“Help me think through whether it makes sense for my 10-person startup to switch from AWS to GCP — consider cost, migration risk, tooling, and long-term lock-in. Use the smarter model so I get a genuinely careful analysis.”
Technical details
Endpoint
POSThttps://x402.shizu.me/ask-pro?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | — | |
| max_tokens | — |
Output
Schema · Response
{
"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"
}
}Tags
x402
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