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

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. Alternatives: FastAF vs SerpApi, vs toll402, vs serp402, vs AgentBIT, vs 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.

Guides

Add FastAF to Claude Code, Codex and 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
Structured web search results
Google Maps API
Place search and place details
Google News API
Current news search results
Google Jobs API
Job listings and apply links

All APIs → · Guides and benchmarks on the blog →