# x402 Quote Inspector

> x402 Quote Inspector is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.0005/call, status down (last checked 2026-09-15).

Fetches and inspects the structured x402 HTTP 402-payment quote from a given URL or endpoint, returning parsed payment metadata.

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/x402-quote-inspector
- Price: $0.0005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-quote-inspector-db9b0cf7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_29LOq_m0EWL_bsbnnlVNr

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-quote-inspector-db9b0cf7 -d '<json body>'
```

Example prompt: Can you inspect the x402 payment quote for https://example-api.xyz/v1/some-endpoint using a GET request and tell me what the payment terms and metadata look like?

## When to prefer this

Use this endpoint when you need to programmatically inspect or parse x402 HTTP 402 payment quotes from an arbitrary URL or API endpoint, particularly in x402-native workflows on Base/USDC where you want to understand payment requirements before committing to a payment flow.

## Known failure modes

- Target URL does not return a 402 response — inspection may return empty or error result
- Invalid or unreachable URL/endpoint — timeout or connection error
- URL parameter missing — schema validation error
- timeout_ms exceeded (max 12000ms) — request timeout
- Malformed x402 quote at target — parsing failure or incomplete summary

## How this service works

Low-price OpenAI-compatible GPT-5.5 chat completions and text tools over x402 USDC on Base: $0.0001 compact requests, $0.066667 true max-output requests, no subscription.

## Output

Returns a JSON object with ok status, tool name ('x402QuoteInspector'), and a structured summary of the x402 402-payment quote found at the target URL, including payment amount, currency, and other parsed quote metadata.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "x402QuoteInspector",
  "summary": "Structured x402 402-payment quote inspection."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-quote-inspector-db9b0cf7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)