x402search — Pay-Per-Search API Discovery for AI Agents

What is x402search?

x402search is a pay-per-search MCP server that lets AI agents discover 14,000+ x402-enabled HTTP APIs. Each search costs $0.01 USDC on Base mainnet. It requires an EVM private key and USDC balance but no account registration.

How to use x402search?

Install via npm or pip, then configure the MCP client with your EVM private key. For Claude Desktop, add the server to claude_desktop_config.json. For Python agents, install the package and call search_x402_apis(). The tool accepts a query string and optional network, max price, and limit parameters.

Key features of x402search

• Searches 14,000+ x402-enabled HTTP APIs
• Pay-per-search with $0.01 USDC fee
• No account or registration needed
• Supports EVM private key authentication
• Available as a Virtuals ACP agent (ID 22531)
• Returns structured API endpoint URLs and payment metadata

Use cases of x402search

• AI agents discovering token price APIs on the fly
• Agent finding DEX swap routing endpoints dynamically
• Discovering crypto, DeFi, and blockchain APIs with a single query

FAQ from x402search

How much does each search cost?

$0.01 USDC per search, paid on Base mainnet.

What do I need to use x402search?

An EVM private key and USDC on Base mainnet (eip155:8453).

What APIs does x402search search?

It indexes 14,000+ HTTP APIs that support the x402 protocol for micropayments.

Can I filter search results by price?

Yes, the max_price_usdc parameter filters results to APIs at or below that price.

Does x402search work with Python agents?

Yes. Install via pip and use the search_x402_apis function. It integrates with LangChain, CrewAI, AutoGen, and GAME SDK.