# Google Patents API $0.005 per call, pay only for 200 responses Search Google Patents for inventions, patent titles and publication links. /patents5 credits / requestSearch ## x402 pay per call **$0.005 per successful call**, paid in USDC on Base. No account or API key required. The live PAYMENT-REQUIRED header quotes the authoritative price. ### curl request ``` curl -i 'https://api.fastaf.co/x402/v1/patents?query=solar+cell' ``` ### Example 402 payment challenge Illustrative recipient address, not a payment destination. Request a fresh challenge, sign it with an x402 v2 client and retry the same URL with PAYMENT-SIGNATURE. The header is base64 JSON v2; the compatibility body uses v1 aliases on Base. Only successful results settle. ``` HTTP/1.1 402 Payment Required Content-Type: application/json PAYMENT-REQUIRED: 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 { "error": "payment_required", "x402Version": 2, "resource": { "url": "https://api.fastaf.co/x402/v1/patents?query=solar+cell", "description": "Google Patents", "mimeType": "application/json" }, "accepts": [ { "scheme": "exact", "network": "eip155:8453", "amount": "5000", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0x1111111111111111111111111111111111111111", "maxTimeoutSeconds": 300, "extra": { "name": "USD Coin", "version": "2" } } ] } ``` ### Decoded PAYMENT-REQUIRED header ``` { "x402Version": 2, "resource": { "url": "https://api.fastaf.co/x402/v1/patents?query=solar+cell", "description": "Google Patents", "mimeType": "application/json" }, "accepts": [ { "scheme": "exact", "network": "eip155:8453", "amount": "5000", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0x1111111111111111111111111111111111111111", "maxTimeoutSeconds": 300, "extra": { "name": "USD Coin", "version": "2" } } ] } ``` ### JSON discovery response example Search Google Patents for inventions, patent titles and publication links. JSON response; source fields may vary. This example is illustrative. ``` { "organic_results": [ { "title": "Solar cell", "patent_id": "US1234567B2", "link": "https://patents.google.com/patent/US1234567B2/en" } ] } ``` ### Response with an API key The same data over REST with a prepaid key. The JSON body is the example above; failed requests are not charged. ``` curl -H "Authorization: Bearer $FASTAF_API_KEY" 'https://api.fastaf.co/v1/patents?query=solar+cell' ``` ### MCP tools search\_patents MCP tool calls require an API key or OAuth; x402 payments apply to HTTP data calls. [Full endpoint reference for agents](/llms/patents.txt) ## Pricing **x402:** $0.005 per successful call, USDC on Base, no account. **API key:** 5 credits per request from one-time credit packs, without expiry. Credit packs are shared by every endpoint and never renew. Pack Price Credits Per call Per 1,000 calls Starter $10 20,000 $0.0025 $2.50 Growth $29 75,000 $0.00193 $1.93 Scale $99 300,000 $0.00165 $1.65 Pro $299 1,000,000 $0.0015 $1.50 Business $799 3,000,000 $0.00133 $1.33 Free: 500 credits every month after email verification, no card. See [pricing](/pricing/). Alternatives: [FastAF vs SerpApi](/compare/serpapi/), [vs toll402](/compare/toll402/), [vs serp402](/compare/serp402/), [vs AgentBIT](/compare/agentbit/), [vs Amazon PA-API](/compare/amazon-pa-api/). ## Parameters Name Description query Required patent search keywords; no default. page Result page, integer at least 1; omitted uses source default. num Result count, integer 1-100; omitted uses source default. sort Sort order: new or old; omitted uses source default. before Publication cutoff date in YYYY-MM-DD format; omitted means no cutoff. after Publication start date in YYYY-MM-DD format; omitted means no cutoff. inventor Inventor name filter; omitted means any inventor. assignee Assignee name filter; omitted means any assignee. country Patent country code; omitted means any country. language Result language code; omitted uses source default. status Patent status filter; omitted uses source default. ## Response fields * organic\_results Passing these fields to an LLM? See [token-aware web scraping for agents](/use-cases/token-aware-scraping/). ## Guides * [Add FastAF to Claude Code, Codex and Cursor](/how-to/add-fastaf-claude-code-codex-cursor/) One remote MCP server, three clients: the claude, codex and Cursor mcp.json setup for https://api.fastaf.co/mcp, with the API key auth it really uses. ## FAQ ### What input is required? query. ### How do agents request patent data? Send query to /v1/patents with a FastAF API key, or to /x402/v1/patents with an x402 client, or use the MCP tool. Keep each publication link and the request date with the results you store. ### What does a call cost? 5 credits or $0.005 via x402. Start with 500 free credits every month after email verification; optional credit packs are available. ### How much does one Google Patents API call cost? With x402 it is $0.005 per successful call in USDC on Base, with no account. With an API key it is 5 credits per request, which is $0.0025 on the $10 Starter pack down to $0.00133 on the $799 Business pack. Failed requests are never charged. ### Do I need an account or an API key for Google Patents API? Not for x402: send the request, pay the 402 challenge in USDC and retry. For credits, sign up free, confirm your email and use the API key in the Authorization header. Accounts get 500 free credits every month after email verification; they do not apply to x402. ## Other APIs * [Google SERP API](/apis/google-serp-api/) Structured web search results * [Google Maps API](/apis/google-maps-api/) Place search and place details * [Google News API](/apis/google-news-api/) Current news search results * [Google Jobs API](/apis/google-jobs-api/) Job listings and apply links [All APIs →](/apis/) · [Guides and benchmarks on the blog →](/blog/) ### What it is used for * Search Google Patents for inventions, patent titles and publication links. [Start free](/pricing/)[Docs](/docs/) ## Related * [Google SERP API](/apis/google-serp-api/) * [Google Maps API](/apis/google-maps-api/) * [Amazon API](/apis/amazon-api/)