Nitrograph Health Check

Nitrograph is a discovery layer for agent-payable services. We periodically send a single GET request to each indexed service's advertised endpoint to verify it's still reachable and responding with a valid payment challenge (x402, MPP, etc). Probes run at most every 6 hours per service while the service is responsive, and every 24 hours otherwise. We honor Retry-After on 429 responses and back off automatically. The probe is identified by the User-Agent Nitrograph-HealthCheck/1.0. To opt out or report abuse, email info@nitrograph.com with your domain and we'll remove it within one business day.