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Maxwell x402 Endpoint Inspector
x402
Maxwell x402 Endpoint Inspector is a paid API for AI agents from api.maxwellinternational.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Checks a single HTTP(S) URL for a valid x402 payment challenge, reports its USDC price relative to category peers, lists payTo wallets with 30-day USDC received, and shows probe-based uptime history — without making a payment.
Price / call$0.002
Success—
StatusUnknown
How this service works
Checks one http(s) URL without paying it: whether it returns a valid x402 payment challenge, its USDC price against the median of its category, the payTo wallets and their USDC received in the last 30 days where our collector has them, and our own probe history (uptime since first seen). Signals with sources; a factual report, not a safety verdict.
Output
A structured report including: whether the URL returns a valid x402 402 payment challenge (state and any problems), the endpoint's USDC price and how it compares to the median for its category, known payTo wallet addresses and the USDC each has received in the last 30 days (where collected), and the probe/uptime history since the endpoint was first seen. All signals are sourced; no safety verdict is issued.
Example use cases
Pre-purchase x402 endpoint vetting
“Before I pay for it, can you inspect https://www.x402scan.com/api/x402/resources with a GET request and tell me if the x402 challenge is valid, what the USDC price is, and whether the payout wallet has actually been receiving money recently?”
Pricing fairness check against category
“I found an x402 API at https://api.someservice.io/data — do a GET check on it and tell me if its USDC price is high, low, or about average compared to similar x402 endpoints in its category?”
x402 endpoint uptime audit
“Can you run an x402 health check on https://news.example.com/headlines via GET and show me its probe history and uptime since it was first detected, so I can see if it's been reliable?”
Technical details
Endpoint
GEThttps://api.maxwellinternational.ai/v1/x402/endpoint/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a factual, no-payment inspection of a specific x402 URL — especially to verify protocol compliance, compare pricing to peers, trace payout wallets, or audit uptime history before deciding whether to pay. Prefer this over generic HTTP probers when x402-specific signals (price, wallet, category median, probe history) are needed. Not a safety verdict tool; use it for due diligence and discovery.
Side effects
- URL does not return a 402 response (not an x402 endpoint)
- x402 challenge is malformed or missing required fields (problems array populated)
- Wallet payment history not available if not collected by Maxwell's collector
- Uptime history absent for newly discovered endpoints
- Network timeout if the target URL is unreachable
- Invalid HTTP method supplied (must be GET, HEAD, or DELETE)
- Input URL uses an unsupported scheme (not http or https)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://www.x402scan.com/api/x402/resources",
"paywall": {
"state": "ok_402",
"problems": []
}
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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