MCP server for Silverback DeFi Intelligence — 27 paid endpoints via x402 micropayments. No API keys, no subscriptions. Your AI agent pays per call in USDC on Base.

PRIVATE_KEY=0xYourKey npx -y silverback-x402-mcp

The server registers 27 DeFi intelligence tools over stdio. Your agent can immediately query swap routes, yield opportunities, token audits, whale movements, portfolio analytics, and more.

• Node.js 20+
• Wallet private key with USDC on Base (+ small amount of ETH for gas)

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "silverback": {
      "command": "npx",
      "args": ["-y", "silverback-x402-mcp"],
      "env": {
        "PRIVATE_KEY": "0xYourPrivateKeyHere"
      }
    }
  }
}

Restart Claude Desktop. You'll see Silverback tools in the tools menu.

Add to .cursor/mcp.json in your project:

{
  "mcpServers": {
    "silverback": {
      "command": "npx",
      "args": ["-y", "silverback-x402-mcp"],
      "env": {
        "PRIVATE_KEY": "0xYourPrivateKeyHere"
      }
    }
  }
}

claude mcp add silverback -- npx -y silverback-x402-mcp

Set PRIVATE_KEY in your environment.

AI Agent (Claude, Cursor, etc.)
  |  stdio JSON-RPC
  v
silverback-x402-mcp (local, has your wallet)
  |  1. Tool call from agent
  |  2. HTTP request to Silverback API
  |  3. Server returns 402 Payment Required
  |  4. MCP server auto-signs USDC payment
  |  5. Retries with payment proof
  |  6. Returns data to agent
  v
Silverback API (x402.silverbackdefi.app)

Payment is invisible to the agent. It calls a tool, the MCP server handles x402 payment, and returns the data.

Silverback accepts USDC on:

• Base (primary) — via CDP facilitator
• Solana — via PayAI facilitator
• SKALE Base — zero gas fees
• Keeta — zero gas fees

This MCP server pays via Base USDC by default.

• API: https://x402.silverbackdefi.app
• Website: https://silverbackdefi.app
• ERC-8004 Agent: https://8004agents.ai/ethereum/agent/13026
• X: https://x.com/silverbackdefi

MIT