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A complete example of an AI agent that discovers and pays for a protected API endpoint.

​
Client: the agent

agent.ts
import "dotenv/config"
import { payer } from "@faremeter/rides"
import { getLogger } from "@faremeter/logs"

const logger = await getLogger(["agent"])

await payer.addLocalWallet(process.env.PAYER_KEYPAIR_PATH)

const response = await payer.fetch("http://localhost:3000/api/analyze", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    prompt: "Summarize the latest market trends",
  }),
})

if (!response.ok) {
  throw new Error(`Request failed: ${response.status}`)
}

const result = await response.json()
logger.info(JSON.stringify(result))

​
Server: the paid API

server.ts
import express from "express"
import { createMiddleware } from "@faremeter/middleware/express"
import { x402Exact } from "@faremeter/info/solana"

const app = express()
app.use(express.json())

const paymentWall = await createMiddleware({
  facilitatorURL: "https://facilitator.corbits.dev",
  accepts: [
    ...x402Exact({
      network: "devnet",
      payTo: process.env.MERCHANT_ADDRESS,
      asset: "USDC",
      amount: "5000",
    }),
  ],
})

app.post("/api/analyze", paymentWall, (req, res) => {
  const { prompt } = req.body
  res.json({
    analysis: `Analysis for: ${prompt}`,
    timestamp: new Date().toISOString(),
  })
})

app.listen(3000)

​
Running the example

# Terminal 1: Start the server
MERCHANT_ADDRESS=7xKXwxRPMo2sUAT5... pnpm tsx server.ts

# Terminal 2: Run the agent
PAYER_KEYPAIR_PATH=~/.config/solana/id.json pnpm tsx agent.ts
The agent makes a POST request. The server responds with 402. Rides handles the payment. The server returns the analysis result.