APIs & SDKs
x402serps
Pay-per-call web search API for AI agents
A pay-per-call search API and MCP server for AI agents, paid with USDC on Base or Solana or prepaid card credits, with no subscription required.
Overview
A look at x402serps.com
x402serps provides web search results via API on a pay-per-request basis. Each successful request is charged at advertised prices in USDC on Base or Solana via x402, or from prepaid credits purchased by card.
The service offers multiple search endpoints including web search, news search, image search, places search, shopping search, scholar search, video search, and specialized tools like deep research, competitor reports, lead finder, and SEO audit. Results are delivered via HTTP API or as an MCP server with 19 tools.
Payment uses the x402 protocol for cryptocurrency payments or prepaid credit keys (xs_...). A free trial is available with 25 calls per network. Results served from cache are marked with X-Cache: HIT header and cost 50% less for credit key holders. The service requires no account setup for x402 payments.
Feature notes
- Web search with up to 100 results and date filtering
- News search with filtering options
- URL extraction to clean markdown
- Deep research with cited briefs
- Competitor report with rankings and share of voice
- Lead finder for local businesses
- SEO audit with page analysis
- JavaScript, Python, and LangChain integrations
- OpenAI and Claude function calling support
- MCP server with 19 tools
Pricing
Pricing model: Freemium
Web search: $0.004/10 results; News search: $0.004/10 results; URL extract: $0.003/URL; Search + extract: $0.02; Deep research: $0.08; AI visibility check: $0.10; Competitor report: $0.30; Lead finder: $0.25; SEO audit: $0.20; News digest: $0.05; Cited answer: $0.02; Crawl site: $0.002/page; Map sit
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FAQ
- How do I pay for a call with x402?
- An unpaid call returns HTTP 402 with the payment requirements. Retry the same request with the signed payment in the PAYMENT-SIGNATURE header (x402 v2), or X-PAYMENT with X402-Version: 1 for v1 clients. The payment is verified and settled before results are returned.
- Which chains and tokens are accepted?
- USDC only, with the exact scheme, on Base mainnet and Solana mainnet. Testnets are not accepted. Always use the amount, asset and payTo from the 402 response you just received.
- Am I charged for failed calls?
- No. Calls that fail on the service side after payment verification are not charged.
- How does the free trial work?
- Send X-Trial: 1 on search, news, single-URL extract, images, places, shopping, scholar or videos. You get 25 calls per network and up to 10 per minute.
- How do I check my credit balance?
- Call GET /api/v1/balance with your Bearer key. Every credit-key response also includes X-Credits-Remaining and X-Credits-Charged headers.
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