# Clawy Claude Opus Inference (x402 Pay-per-call)

> Clawy Claude Opus Inference (x402 Pay-per-call) is a paid API for AI agents from clawy.uk, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).

Runs Claude Opus chat completions via HTTP-402 micropayment (x402/USDC on Base), with no API keys or subscriptions required.

## Facts

- Endpoint: POST https://clawy.uk/v1/chat/opus
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/clawy-claude-opus-chat-inference-x402-usdc-46a1838c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pThSVwnvojQU6j_j1cfv4

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 clawy-claude-opus-chat-inference-x402-usdc-46a1838c -d '<json body>'
```

Example prompt: Ask Claude Opus: 'Summarize the key differences between transformer and diffusion models in 3 bullet points' — pay the per-call USDC fee automatically, no API key needed.

## When to prefer this

Choose this endpoint when you need Claude Opus completions without wanting to manage Anthropic API keys or subscriptions, and your agent or workflow supports x402 micropayment headers with USDC on Base. Ideal for one-off or low-volume inference calls where a subscription would be wasteful, or for fully autonomous agents that pay for compute programmatically.

## Known failure modes

- 402 Payment Required if x402 payment header is missing or payment fails
- Insufficient USDC balance causes payment rejection and no response
- Invalid or malformed messages array returns 400 Bad Request
- Rate limits or upstream Anthropic outages return 503 or 5xx
- Network timeout if Base settlement takes longer than expected

## How this service works

HTTP-402 gated ChatGPT and Claude Opus inference. $0.02–$0.05 USDC per call, settled in &lt;2s on Base via the x402 protocol. No API keys, no signup, no subscriptions.

## Output

Returns a JSON object in OpenAI-compatible chat.completion format containing the assistant's reply text, model identifier (claude-opus-4-8), prompt/completion/total token counts, finish reason, and Clawy-specific metadata (delivery method and provider). Payment of ~$0.15 USDC is settled on Base via x402 in under 2 seconds.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-clawy-xyz789",
  "model": "claude-opus-4-8",
  "usage": {
   "total_tokens": 11,
   "prompt_tokens": 8,
   "completion_tokens": 3
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello back."
    },
    "finish_reason": "stop"
   }
  ],
  "x_clawy": {
   "delivery": "claude-cli",
   "provider": "anthropic"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/clawy-claude-opus-chat-inference-x402-usdc-46a1838c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clawy.uk](https://www.zero.xyz/host/clawy.uk/llms.txt)