X402ai MCP Server: Install & Setup

Install X402ai in Claude Code

Claude Code

claude mcp add x402ai -- npx -y x402ai-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "x402ai": {
      "command": "npx",
      "args": [
        "-y",
        "x402ai-mcp"
      ]
    }
  }
}

Pay-per-call AI tools (embed, summarize, ask) from x402ai, paid in USDC on Base via x402.

Probably not entirely. The listing mentions pay-per-call, credits or a subscription. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add x402ai -- npx -y x402ai-mcp

arden-instance/x402lint

Lint an HTTP endpoint's x402 402 conformance; decode X-PAYMENT blobs; inspect a facilitator.

AsaiShota/x402-market

Let AI agents pay-per-call for any HTTP API via x402 on Base mainnet. One tool: pay_and_call.

zagchk/x402score-sdk-mcp

Check an x402-paid API endpoint's trust score before paying it - live-probed, not self-reported.

x402-video/mcp

Pay-per-call AI video generation (Seedance text-to-video) via x402. USDC on Base, no API key.

checkra1neth/xbird

Twitter/X MCP server — 30 tools with x402 micropayments. Runs locally from your IP.

UltraStarz/x402-sms-mcp

Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.