Monetize Any
MCP Tool
in 3 Lines

import express from 'express'
import { mcpay } from '@nikhilraikwar/mcpay'  // npm i @nikhilraikwar/mcpay

const app = express()

// ── TOOL 1: Weather — $0.01 flat ──
app.use(...mcpay({
  price:         '$0.01',
  walletAddress: process.env.TOOL_WALLET_ADDRESS,
  toolName:      'weather-data',
  description:   'Real-time weather for any city',
}))

// ── TOOL 2: AI Inference — dynamic pricing by model ──
app.use(...mcpay({
  price:         (req) => getDynamicPrice(req.body.model),
  walletAddress: process.env.TOOL_WALLET_ADDRESS,
  toolName:      'ai-inference',
  description:   'Pay-per-inference across 5 AI models',
}))

// Agent-side: mcpayFetch auto-handles 402 + OWS payment
import { mcpayFetch } from '@nikhilraikwar/mcpay'

const result = await mcpayFetch('http://localhost:3001/tools/weather-data', {
  method:    'POST',
  body:      JSON.stringify({ city: 'Delhi' }),
  owsWallet: 'mcpay-agent',   // OWS wallet name
  maxPrice:  '$0.05'            // OWS policy ceiling
})
// → { city: 'Delhi', temperature: '28°C', _mcpay: { paid: '$0.01' } }
// 402 intercepted → OWS CLI pays → result returned automatically