X402 Seller vs X402 API

In-depth architectural comparison of the X402 Seller and X402 API MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose X402 Seller when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore X402 Seller Details

Choose X402 API when:

• You need dedicated capabilities in the Finance & Fintech domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore X402 API Details

Feature & Specification Comparison

Specification	X402 Seller Finance & Fintech	X402 API Finance & Fintech
Summary	Pay-per-call MCP tools (crypto/DeFi data, web reading, AI tasks) in USDC over x402 on Base.	DeFi data API for AI agents — pay-per-call via x402/USDC on Base
Category & Scope	Finance & Fintech	Finance & Fintech
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "x402-seller": {
      "url": "http://localhost:4021"
    }
  }
}

{
  "mcpServers": {
    "x402-api": {
      "command": "npx",
      "args": [
        "-y",
        "@x402-api/mcp-server"
      ]
    }
  }
}

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