X402search

Search 14,000+ x402-enabled HTTP APIs from any MCP-compatible agent.

Version: 1.0.3 · License: MIT · Cost: $0.01 USDC per search · Base mainnet · No account needed

npm: https://www.npmjs.com/package/x402search-mcp
PyPI: https://pypi.org/project/x402search-mcp
API: https://x402search.xyz

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Requirements

• A wallet private key (EVM)
• USDC on Base mainnet (eip155:8453)
• Get USDC on Base: https://www.coinbase.com/how-to-buy/usdc

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Install: Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "x402search": {
      "command": "npx",
      "args": ["[email protected]"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_PRIVATE_KEY_HERE"
      }
    }
  }
}

Config file location:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

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Install: Claude Code

claude mcp add x402search -- npx [email protected]

Then set your key:

export EVM_PRIVATE_KEY=0xYOUR_PRIVATE_KEY_HERE

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Install: Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "x402search": {
      "command": "npx",
      "args": ["[email protected]"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_PRIVATE_KEY_HERE"
      }
    }
  }
}

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Install: Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "x402search": {
      "command": "npx",
      "args": ["[email protected]"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_PRIVATE_KEY_HERE"
      }
    }
  }
}

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Install: Python agents (LangChain, CrewAI, AutoGen, GAME SDK)

pip install x402search-mcp

from x402search import search_x402_apis
results = search_x402_apis(
    query="token price API ethereum",
    private_key="0xYOUR_PRIVATE_KEY_HERE"
)
print(results)

Full docs: https://pypi.org/project/x402search-mcp

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Quick Test

EVM_PRIVATE_KEY=0xYOUR_KEY npx [email protected]

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Tool: search_x402_apis

Parameter	Type	Required	Description
query	string	yes	e.g. "token price API", "DEX swap routing"
network	string	no	e.g. "eip155:8453" for Base mainnet
max_price_usdc	number	no	Filter to APIs at or below this price
limit	number	no	Max results (default 10, max 50)

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Virtuals ACP Integration

x402search is available as a native ACP agent on the Virtuals protocol marketplace.

• Agent ID: 22531
• Agent profile: https://app.virtuals.io/acp/agent-details/22531
• Job name: x402search
• Price: 0.01 USDC per search
• Accepts crypto, DeFi, and blockchain API discovery queries
• Rejects off-topic requests automatically at the request phase
• Returns structured results: endpoint URLs, payment metadata, network, and relevance rank

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Links

• npm: https://www.npmjs.com/package/x402search-mcp
• PyPI: https://pypi.org/project/x402search-mcp
• API: https://x402search.xyz
• Health: https://x402search.xyz/health
• GitHub: https://github.com/x402-index/x402search-mcp
• x402 protocol: https://x402.org