# llm402.ai Claude Opus 4.7 Fast Inference

> llm402.ai Claude Opus 4.7 Fast Inference is a paid API for AI agents from llm402.ai, paid per call via x402, $0.33792/call, status down (last checked 2026-10-22).

Runs LLM inference against Claude Opus 4.7 Fast via a pay-per-call x402 API endpoint

## Facts

- Endpoint: POST https://llm402.ai/v1/chat/completions/claude-opus-4.7-fast?utm_source=zero.xyz
- Price: $0.33792/call
- Payment: x402
- Status: down
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/llm402-ai-claude-opus-4-7-fast-inference-fec9b7fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gkWMujVR9FK7z4WDWegqs

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 llm402-ai-claude-opus-4-7-fast-inference-fec9b7fa -d '<json body>'
```

Example prompt: Send this conversation thread to Claude Opus 4.7 Fast and get a response: system prompt is 'You are a concise assistant', and the user says 'Summarize the key points of the attached report in three bullet points.'

## When to prefer this

Choose this endpoint when you need Claude Opus 4.7 Fast inference on a strict pay-per-call basis without managing Anthropic API keys or subscriptions, especially in agentic or automated workflows that require x402 USDC micropayment billing. Ideal for agents needing frontier-model reasoning at low per-call cost ($0.34 per call) with an OpenAI-compatible interface. Prefer this over raw Anthropic API access when you want decentralized, programmable payment flows or when operating in crypto-native environments.

## Known failure modes

- Payment failure (x402 USDC payment not accepted or insufficient balance)
- Malformed messages array causes 400 bad request
- Model overload or rate limiting returns 429 or 503
- Context window exceeded if conversation history is too long
- Network timeout if inference takes longer than expected
- Invalid API format or missing required fields returns 422

## How this service works

LLM inference

## Output

Returns a chat completion object in OpenAI-compatible format, including the assistant's generated message content, finish reason, token usage counts (prompt tokens, completion tokens, total tokens), and model metadata. The primary output is the assistant's text reply to the provided messages.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "const": "anthropic/claude-opus-4.7-fast",
   "description": "This endpoint serves exactly one model."
  },
  "top_k": {
   "type": "integer",
   "minimum": 1
  },
  "top_p": {
   "type": "number",
   "maximum": 1,
   "minimum": 0
  },
  "stream": {
   "type": "boolean",
   "default": false
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool"
      ],
      "type": "string"
     },
     "content": {
      "type": "string"
     }
    }
   },
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "minimum": 1,
   "description": "Cap on generated tokens. Price scales with this cap."
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/llm402-ai-claude-opus-4-7-fast-inference-fec9b7fa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llm402.ai](https://www.zero.xyz/host/llm402.ai/llms.txt)