Know when your x402 service breaks, before your callers do

If you run a paid x402 API, we probably already probe it. Graded checks about 4,900 listed services every 6 hours and keeps every result. Since 2026-10-08 that is a public record of each service's uptime, latency and grade. Nobody can go back and collect that history later, so it only gets more useful with time.

Free

No card and no email. Create a free account, claim your service by adding a token we give you to your own site, and you get:

• The public history for your service: daily uptime, latency and grade.
• An embeddable badge for your README or docs that shows your current grade and uptime.

Alerts, $7 a month

We watch your service between your own checks and tell you when something changes. You get a message when your service goes down (two failed probes in a row, so one blip does not page you), when it recovers, when its grade drops, when its price changes, and when its latency more than doubles compared with its last 7 days.

Delivery goes to a webhook you choose, signed so you can verify it. Slack and Discord webhook URLs work directly. Alerts can also go to an email address, once you confirm it from a link we send there.

The first 30 days are free. A card is required to start, and you can cancel any time before day 30 without paying anything. After the trial your card is charged $7 a month, and we email you before the first charge. Each account gets one free trial.

You cancel yourself from the billing portal, with no email to us and no questions. Cancelling stops the next charge, and your plan stays active until the end of the period you already paid for.