x402serpsWeb search API for autonomous agents
Autonomous agents need to look things up without a human creating accounts for them. x402serps is a pay-per-call web search API: the agent gets an HTTP 402 price quote, pays $0.004 in USDC over x402 and gets JSON results in the same request. No subscription and no monthly minimum.
| x402serps | |
|---|---|
| Search | $0.004 per call, 10 results |
| Extract | $0.003 per URL, clean text |
| Payment | x402 USDC on Base or Solana, or card credit keys |
| Try it | 25 trial calls, plus 20 free MCP calls a day |
| Interfaces | REST, OpenAPI, hosted MCP server, LangChain and Vercel AI SDK tools |
| Data | Third-party search provider; web, news, images, places, shopping, scholar, videos |
Built for agent loops
Search, then extract the pages that matter, or use search-extract, batch and deep research to do it in one call. Responses are compact JSON sized for a model context window.
Pay as the agent goes
Each request settles on its own, so cost tracks usage exactly. Card buyers get an xs_ key with prepaid credits instead.
Discoverable by agents
Listed in the x402 Bazaar, x402scan and the official MCP Registry, with llms.txt, OpenAPI and skill.md for tool discovery.
Try it free
Add the header X-Trial: 1 for free trial calls (limited per network and to 10 a minute). Paid calls (x402 or a credit key) have no per-minute rate limit.
curl -X POST https://x402serps.com/api/v1/search -H "X-Trial: 1" -H "content-type: application/json" -d '{"q":"x402 payment protocol"}'Pricing · Docs · MCP · Integrations · Help