# Maxwell x402 USPTO Patent Search

> Maxwell x402 USPTO Patent Search is a paid API for AI agents from api.maxwellinternational.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).

Search US patents by keyword (up to 10 recent USPTO applications/grants) or fetch a single patent by number, returning title, assignee, inventors, dates, status, and CPC classes.

## Facts

- Endpoint: GET https://api.maxwellinternational.ai/v1/uspto/patent?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/maxwell-x402-uspto-patent-search-679648bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pvKcG6gEnz7DMyf5RHytZ

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-uspto-patent-search-679648bf
```

Example prompt: Can you look up US patent number US11000000 and tell me who owns it, when it was filed and granted, and what CPC classes it falls under?

## When to prefer this

Use this endpoint when you need structured USPTO patent metadata — title, assignee, inventors, dates, status, and CPC codes — for a specific patent number or a keyword-based search of recent filings. Prefer this over raw USPTO search when you need a simple, pay-per-call API with clean JSON output and no authentication setup. Not suitable for bulk patent mining, full-text patent content, or historical patent corpora beyond recent filings.

## Known failure modes

- Patent number not found — returns empty or error response
- Keyword query returns no results if no recent USPTO filings match
- Malformed patent number format may cause lookup failure
- Rate limiting or payment failure (x402) if USDC payment not processed
- Keyword search limited to recent patents; older patents may not appear

## How this service works

US patent search by keywords (?q=, every word must match; up to 10 USPTO applications and grants, newest filing first) or one patent by number (?patentNumber=US11000000). Each result: title, assignee, inventors, CPC classes, filing and grant dates, USPTO status, and patentNumber for granted patents or applicationNumber for pending applications. Uncached: 404, not charged.

## Output

Returns a JSON object (or array for keyword search) with patent number, title, assignee, inventors, filing date, grant date, granted boolean, USPTO status string, and CPC classification codes. Keyword search returns up to 10 recent matching USPTO applications and grants.

## 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": {
  "cpc": [
   "A61F 2/243"
  ],
  "title": "REPOSITIONING WIRES AND METHODS FOR REPOSITIONING PROSTHETIC HEART VALVE DEVI...",
  "status": "Patented Case",
  "granted": true,
  "assignee": "4C MEDICAL TECHNOLOGIES, INC.",
  "grantDate": "2021-05-11",
  "filingDate": "2019-09-12",
  "patentNumber": "US11000000"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/maxwell-x402-uspto-patent-search-679648bf/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)