User Agent Parser API

User Agent Parser API

Parse any user agent string into structured data: browser, OS, device type, engine, and bot detection in one call. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "user-agent-parser": {
      "url": "https://user-agent-parser.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://user-agent-parser.api.klymax402.com/api/parse" \
  -H "Content-Type: application/json" \
  -d '{"userAgent":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
utility_parse_user_agent	POST	/api/parse	$0.003	Parse a user agent string into structured data

utility_parse_user_agent

Use this when you need to parse a user agent string to identify the client's browser, OS, device type, and bot status. Returns fully structured data.

Parameters

Name	Type	Required	Description
userAgent	string	yes	The user agent string to parse

Example response:

{"browser":{"name":"Chrome","version":"120.0"},"os":{"name":"Windows","version":"11"},"device":{"type":"desktop","vendor":null,"model":null},"engine":"Blink","isBot":false,"botName":null}

When to use: analytics pipelines that need to classify traffic by device or browser, detecting bot traffic in access logs, or adapting content based on client capabilities.

Not for: HTTP header analysis (use utility_parse_http_headers), web scraping (use web_scrape_to_markdown), SEO auditing (use seo_audit_page).

Example agent prompts

• "Parse a user agent string to identify the client's browser, OS, device type, and bot status"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT