x402 Endpoint Monitor (7 days)

One payment watches an x402 endpoint for 7 days without paying it: a check about every 4 hours with verdict, price, wallet and latency, history at a private URL and a signed webhook when the verdict changes (goes down, changes wallet or price).

Price$0.05 USDC

Paymentx402 · Base

AccountNot needed

If it failsNot charged

Who it is for

Sellers who want to know right away when their x402 route stops charging, and agents that depend on a seller.

Learn your endpoint is down before your buyers do
Detect a seller changing its wallet or price
Keep an uptime history to show buyers

How an agent buys it

POST https://a-upgradenet.com/x402/endpoint-monitor
Content-Type: application/json

{
  "url": "https://a-upgradenet.com/x402/web-read",
  "method": "POST",
  "body": {
    "url": "https://www.x402.org"
  }
}

1) Answers 402 with the price (PAYMENT-REQUIRED)
2) The agent signs the payment (EIP-3009, USDC on Base) and repeats with PAYMENT-SIGNATURE
3) Receives the result + PAYMENT-RESPONSE

Example response

{
  "status": "completed",
  "monitor_id": "mon_3k9x2p7q1z8w4v6r",
  "status_url": "https://a-upgradenet.com/api/monitors/mon_3k9x2p7q1z8w4v6r?token=…",
  "token": "…",
  "expires_at": "2026-11-08T05:00:00.000Z",
  "interval_hours": 4,
  "checks_planned": 42,
  "webhook_url": null,
  "first_check": {
    "verdict": "ok",
    "http_status": 402,
    "latency_ms": 380,
    "price_atomic": 5000,
    "pay_to": "0xbdae34e121dff6da6fbb71208322e8be0a923512",
    "issues": []
  },
  "note": "Keep the token: it is shown once and is the only way to read the history."
}

Full documentation → See all products