# x402.shizu.me OpenAI-Compatible Chat Completions (USDC, No Key)

> 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.

## Facts

- Endpoint: POST https://x402.shizu.me/v1/chat/completions?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-shizu-me-openai-compatible-chat-completions-usdc-no-key-4c82be6a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FqN2gctK4xtIqQsJJCV_7

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-openai-compatible-chat-completions-usdc-no-key-4c82be6a -d '<json body>'
```

Example prompt: Without any API key or account, ask an LLM: given the system prompt 'You are a helpful assistant', and the user message 'Summarize the key risks of DeFi lending in 3 bullet points', return a chat completion with max 200 tokens at temperature 0.7.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {},
  "messages": {},
  "max_tokens": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-shizu-me-openai-compatible-chat-completions-usdc-no-key-4c82be6a/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)