x402stock Patent Assignment Lookup

x402

x402stock Patent Assignment Lookup is a paid API for AI agents from x402stock.xyz, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-22).

Retrieves USPTO patent assignment records for a given US patent application number

Price / call$0.02

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call market and economic data API for AI agents: US stocks, ETFs and options, forex, crypto and on-chain perps, energy commodities, US and global macro (Fed, CPI, jobs, GDP, Treasury, World Bank), SEC filings, congressional trades, and market sentiment. No API keys, no accounts. Pay per request in USDC via x402 on Base.

Output

Returns a JSON object containing the application number, list of assignment records each with assignee details (name and location), assignor names, conveyance type, reel/frame identifier, document download URL, received date, and recorded date, plus a count and USPTO source attribution.

Example use cases

Example prompt

“Can you look up the patent assignment records for US patent application number 18687455 and tell me who the current assignee is and when the assignment was recorded?”

Technical details

Endpoint

GEThttps://x402stock.xyz/api/v1/patent/%7Bapplication%7D/assignments?utm_source=zero.xyz

When to prefer

Use this endpoint when you need structured, machine-readable USPTO patent assignment data for a specific US patent application number — particularly when you need assignee identity, assignment dates, and official document references without setting up a USPTO API key or account. Ideal for AI agents performing due diligence, IP research, or competitive intelligence that need to pay per query via USDC on Base rather than committing to a subscription.

Side effects

Invalid or non-existent application number returns empty assignments array
Malformed application number format may return 400 or empty result
Application with no recorded assignments returns count:0
Payment failure via x402/USDC results in 402 Payment Required response
USPTO data source temporarily unavailable causes service error

Input

Schema · Request body

Field	Type	Description
properties	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "as_of": "2026-06-18T12:00:00.000Z",
    "count": 1,
    "source": "uspto",
    "assignments": [
      {
        "assignees": [
          {
            "name": "ZF PASSIVE SAFETY SYSTEMS US INC.",
            "location": "WASHINGTON, MI, UNITED STATES"
          }
        ],
        "assignors": [
          "BAUCHER, CHRISTOPHER",
          "FISCHER, KURT",
          "MOHANTY, ADITYA"
        ],
        "conveyance": "ASSIGNMENT OF ASSIGNOR'S INTEREST",
        "reel_frame": "068632/0697",
        "document_url": "https://assignmentcenter.uspto.gov/ipas/search/api/v2/public/download/patent/68632/697",
        "received_date": "2024-09-19",
        "recorded_date": "2024-09-19"
      }
    ],
    "attribution": "Source: U.S. Patent and Trademark Office (USPTO) Open Data Portal",
    "application_number": "18687455"
  }
}

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