{"uid":"cap_jkQLEXDjdI8vTCz_-j353","slug":"x402stock-patent-assignment-lookup-d317862f","name":"x402stock Patent Assignment Lookup","description":"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.","url":"https://x402stock.xyz/api/v1/patent/%7Bapplication%7D/assignments?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"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"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nZGVJSmY8oVnb8cxs99SN","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Retrieves USPTO patent assignment records for a given US patent application number","exampleAgentPrompt":"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?","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T06:38:03.812Z","isFirstParty":false,"canonicalSlug":"x402stock-patent-assignment-lookup-d317862f"}