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x402.shizu.me OpenAI-Compatible Chat Completions (USDC, No Key)
x402
x402.shizu.me OpenAI-Compatible Chat Completions (USDC, No Key) is a paid API for AI agents from x402.shizu.me, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-02).
Provides an OpenAI-compatible chat completions endpoint backed by Claude Haiku, payable per-call in USDC with no account or API key required.
Price / call$0.015
Success—
StatusUnknown
How this service works
Drop-in OpenAI Chat Completions — point any OpenAI SDK's base_url here and pay per call in USDC, no account or key. POST {model, messages:[{role,content}], max_tokens?, temperature?, stream?}. Backed by Claude Haiku; flat price regardless of model. Multi-turn (system/user/assistant), OpenAI-shaped choices[]+usage. Input ~3000 words, output capped 512 tokens. The account-less inference gateway for looping agents.
Output
Returns an OpenAI-shaped JSON response with a choices array containing the assistant's message content and finish reason, plus a usage object with prompt and completion token counts. The response is structurally identical to the OpenAI Chat Completions API, making it a drop-in replacement for any OpenAI SDK consumer.
Example use cases
Keyless agent self-funding inference
“I want my autonomous agent to call an LLM for reasoning steps without me having to manage any API keys — just have it pay per call in USDC. Use the messages [{role:'system',content:'You are a task planner.'},{role:'user',content:'Break this goal into 5 steps: launch a new product page.'}] with max_tokens 300.”
Multi-turn conversation in a loop
“Run a multi-turn chat with no signup: start with system message 'You are a Socratic tutor', then user says 'Explain entropy', then assistant replies with the prior answer, then user asks 'Give me a real-world example' — give me the next assistant response, capped at 150 tokens.”
Drop-in OpenAI SDK replacement
“I already have code using the OpenAI Python SDK but I don't want to manage an API key or pay monthly — just point it at a pay-per-call endpoint and send the message 'Write a haiku about blockchains' with temperature 0.9 and max 60 tokens.”
Technical details
Endpoint
POSThttps://x402.shizu.me/v1/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need anonymous, account-free LLM inference payable in USDC micropayments — especially for autonomous agents that self-fund their own AI calls. Prefer it when you already use the OpenAI SDK and want a zero-friction drop-in (just swap base_url), when you need multi-turn conversation support, or when avoiding API key management and monthly subscriptions is a priority. Not ideal for long-context inputs over 3000 words, outputs requiring more than 512 tokens, or use cases where a specific model (not Claude Haiku) is required.
Side effects
- Insufficient USDC payment results in 402 Payment Required
- Input exceeding ~3000 words may be truncated or rejected
- Output hard-capped at 512 tokens regardless of max_tokens setting
- Streaming may not be supported or may differ from OpenAI's SSE format
- Model parameter is accepted but ignored — always routes to Claude Haiku
- Malformed messages array (missing role or content) returns 400 Bad Request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | — | |
| messages | — | |
| max_tokens | — |
Tags
x402
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