Add Payments to Your API

Reference https://amp.valeoprotocol.io/quickstart/server
Add AMP payments to my Express server with a /v1/data route
that charges $0.01 per request using USDC on Solana.

npm install @valeo/amp-server @solana/web3.js

import express from "express"
import { AMP } from "@valeo/amp-server"
 
const app = express()
 
// Protect all routes — $0.001 per call
app.use(AMP.middleware({ rate: "0.001/call" }))
 
app.get("/v1/data", (req, res) => {
  res.json({
    message: "Hello from a paid API!",
    channel: req.amp?.channel?.toBase58(),
  })
})
 
app.listen(3000)

import { AMP } from "@valeo/amp-server"
import { Keypair, Connection } from "@solana/web3.js"
 
const serverKeypair = Keypair.fromSecretKey(/* your key */)
const connection = new Connection("https://api.mainnet-beta.solana.com")
 
const amp = new AMP({
  wallet: serverKeypair,
  connection,
  pricing: {
    mode: "per-call",
    rate: "10000",        // $0.01 in USDC (6 decimals)
    token: "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    minDeposit: "1000000", // $1.00 minimum channel deposit
    settleInterval: 3600,  // settle every hour
  },
  routes: {
    "/v1/inference": { mode: "per-call", rate: "100000" },   // $0.10/call
    "/v1/stream":    { mode: "per-second", rate: "1000" },    // $0.001/sec
  },
  settlement: { auto: true, interval: 3600 },
})
 
// Serve pricing manifest
app.get("/.well-known/amp.json", amp.wellKnownHandler())
 
// Protected endpoints
app.use("/v1", amp.middleware())

{
  "amp_version": "1.0",
  "recipient": "<your_pubkey>",
  "program_id": "2d1B2PmumwYWuR82AbXAARTL1nrn8N7Vu9bLXTXUDmVA",
  "network": "solana:mainnet-beta",
  "pricing": {
    "default": {
      "mode": "per-call",
      "rate": "10000",
      "token": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "minDeposit": "1000000",
      "settleInterval": 3600
    }
  }
}