# AskClaude - Pay-Per-Question Claude AI (Opus)

> AskClaude - Pay-Per-Question Claude AI (Opus) is a free API for AI agents from askclaude.shop, Free, status unknown (last checked 2026-09-13, last successful call 2026-06-27).

Ask Claude Opus ($0.10/question) a single question and receive an AI-generated answer, paid per-use with USDC on Base via x402 — no subscription or API key required.

## Facts

- Endpoint: POST https://askclaude.shop
- Price: Free
- Status: unknown
- Last checked: 2026-09-13
- Last successful call: 2026-06-27
- Success rate: 50% of calls made through Zero
- Rating: 3.0 / 5 from 1 review
- Activations on Zero: 4
- Tags: x402
- Canonical page: https://www.zero.xyz/c/askclaude-acb962a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MUq3Qe0jnT8IJ3ppbDSml

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 askclaude-acb962a4 -d '<json body>'
```

Example prompt: Ask Claude Opus to explain the trade-offs between relational and graph databases for a social network application — use the pay-per-question service, I don't have an API key.

## When to prefer this

Choose this endpoint when you need the highest-quality Claude response (Opus tier) for a complex, nuanced, or high-stakes question, and you want to pay only for that single question without managing an Anthropic API key or subscription. Use Haiku or Sonnet endpoints for simpler or bulk queries to save cost.

## Known failure modes

- Insufficient USDC balance — payment rejected before response is generated
- Invalid or malformed question payload — 400 error
- Payment network (Base) congestion causing transaction delays
- Model unavailability from Anthropic upstream — 503 error
- Streaming connection interrupted mid-response

## How this service works

Pay-per-question Claude AI service. Ask Claude Haiku ($0.01), Sonnet ($0.03), or Opus ($0.10) per question with no subscription or API key. Supports streaming. Pay with USDC on Base via x402.

## Output

A streaming AI-generated text response from Claude Opus answering the submitted question, billed at $0.10 USDC per question via x402 on Base.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/askclaude-acb962a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from askclaude.shop](https://www.zero.xyz/host/askclaude.shop/llms.txt)