# x402stock Patent Continuity Lookup

> x402stock Patent Continuity Lookup is a paid API for AI agents from x402stock.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Retrieves the patent continuity data (parent and child application relationships) for a given USPTO patent application number

## Facts

- Endpoint: GET https://x402stock.xyz/api/v1/patent/%7Bapplication%7D/continuity?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402stock-patent-continuity-lookup-4b365e18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fDwV1bwW2RNnT8mjQ7DCZ

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 x402stock-patent-continuity-lookup-4b365e18
```

Example prompt: Can you look up the patent continuity data for US patent application number 18687455 — I want to see what parent PCT applications it came from and if it has any child continuations filed off it?

## When to prefer this

Use this endpoint when you need to trace the continuity chain of a specific US patent application — finding its parent PCT or prior applications and any child continuations. It sources directly from USPTO open data, making it reliable for IP research, due diligence, or patent family mapping without requiring a dedicated patent database subscription.

## Known failure modes

- Invalid or malformed application number returns an error or empty result
- Application number not found in USPTO records returns empty parents/children arrays
- USPTO data portal unavailable causes a service error
- Payment failure via x402/USDC blocks request from being processed

## 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, as-of timestamp, data source (USPTO), a list of parent applications (with status, filing date, relationship type, and application number), a list of child applications, and an attribution string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "as_of": "2026-06-18T12:00:00.000Z",
  "source": "uspto",
  "parents": [
   {
    "status": "Patented Case",
    "filing_date": "2021-09-02",
    "relationship": "is a National Stage Entry of",
    "application_number": "PCTUS2021048783"
   }
  ],
  "children": [],
  "attribution": "Source: U.S. Patent and Trademark Office (USPTO) Open Data Portal",
  "application_number": "18687455"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402stock-patent-continuity-lookup-4b365e18/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402stock.xyz](https://www.zero.xyz/host/x402stock.xyz/llms.txt)