# Maxwell x402 Doctor – Endpoint Checkup

> Maxwell x402 Doctor – Endpoint Checkup 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).

Diagnoses any x402-enabled endpoint to reveal whether it returns a valid payment request, its x402 version, pricing, accepted networks, payTo wallets, and response time — without making a payment.

## Facts

- Endpoint: GET https://api.maxwellinternational.ai/v1/doctor/checkup?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/maxwell-x402-doctor-endpoint-checkup-ccc17373
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AloAnqKWV9bOgVeIrLw1h

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 maxwell-x402-doctor-endpoint-checkup-ccc17373
```

Example prompt: Can you run an x402 doctor checkup on https://api.example.com/some-endpoint using a GET request and tell me if it returns a valid payment request, what price it asks for, which networks it accepts, and what wallet it pays to?

## When to prefer this

Use this endpoint when you need to inspect, validate, or debug an x402-enabled API endpoint without spending any funds. It is the right choice when you want to verify payment request correctness, discover pricing and wallet details, or audit x402 compliance before building an integration or troubleshooting a failed payment flow. Prefer this over the x402 Doctor 'why did my payment fail' sibling when you have not yet attempted a payment and simply want to probe the seller's 402 response.

## Known failure modes

- Target endpoint is unreachable or times out — checkup cannot complete
- Target endpoint does not return a 402 response — verdict reflects non-x402 behavior
- Malformed input URL or unsupported HTTP method causes validation error
- Network or DNS resolution failure for the target endpoint
- Target endpoint rate-limits or blocks the probe request

## How this service works

x402 Doctor checkup of any x402 endpoint, without buying: whether it answers with a valid payment request, its x402 version and any problems in it, the prices and networks it asks for, its payTo wallets and response time.

## Output

Returns a verdict string (e.g. 'seller_up') along with the x402 version detected, any structural problems found in the payment request, the list of prices and currencies requested, accepted blockchain networks, the payTo wallet addresses, and the measured response time — all without triggering an actual payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "verdict": "seller_up"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/maxwell-x402-doctor-endpoint-checkup-ccc17373/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.maxwellinternational.ai](https://www.zero.xyz/host/api.maxwellinternational.ai/llms.txt)