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x402stock Patent Application Assignments Lookup
x402
x402stock Patent Application Assignments Lookup is a paid API for AI agents from agents.x402stock.xyz, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Retrieves assignment history and ownership transfer records for a given US patent application number
Price / call$0.02
Success—
StatusUnknown
How this service works
Market and economic data for AI agents — US stocks, ETFs and options, forex, crypto and on-chain perps, energy commodities (crude, natural gas, gasoline), US and global macro (Fed funds, CPI/PCE, jobs, GDP, Treasury debt & yields, World Bank indicators), SEC filings, congressional trades, and market sentiment. No API keys, no accounts. Pay per request in USDC via x402 or MPP. This server is a pay-per-use, transparent proxy in front of x402stock's own API: it handles identity, payment, and proxying. Agents can purchase autonomously or with their human's approval. This document is the source of truth for agents: it lists the complete verified paid surface with each operation's live price in its x-payment-info. Endpoints not listed here are not part of the supported catalog. The live catalog at /manifest.json is authoritative for prices and any free included units (prices[].includedUnits) - some meters include free usage per account before any charge.
Output
Returns assignment records for the specified US patent application, including assignor names, assignee names, assignment dates, conveyance types (e.g. assignment, security interest, merger), and reel/frame reference numbers as recorded with the USPTO.
Example use cases
M&A patent due diligence
“I'm evaluating an acquisition target — can you look up the assignment history for patent application 17/456789 so I can see every ownership transfer and confirm who currently holds it?”
Startup IP ownership verification
“Before we sign a licensing deal, can you check the assignment records for patent application 15/987654 to confirm it was properly transferred from the founders to the company?”
Competitor patent tracking
“Can you fetch the assignments for patent application 16/321654 filed by our competitor? I want to see if they've sold or transferred it recently.”
Technical details
Endpoint
GEThttps://agents.x402stock.xyz/api/v1/patent/%7Bapplication%7D/assignmentsWhen to prefer
Use this endpoint when you need structured patent assignment and ownership chain data for a specific US patent application number, especially for IP due diligence, legal research, or ownership verification. Prefer this over manual USPTO searches when operating in an automated agent pipeline that can pay per request in USDC without managing API credentials.
Side effects
- Unknown or invalid patent application number returns empty results or 404
- Application number formatting errors (missing leading zeros, wrong format) cause lookup failures
- Newly filed applications may not yet have assignment records
- Network or payment authorization failure returns 402 or 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Tags
x402
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