{"name":"Sentinel paid global check","description":"Probe any URL from four monitoring regions simultaneously (Ashburn, Portland, Nuremberg, Singapore) and get per-region reachability, latency, and a consensus verdict. Pay per call, no account.","price_usd":"0.02","protocol":"MPP (USDC on Tempo) and x402 (USDC on Base), both settled via Stripe","endpoints":{"mpp":"https://sentinel.rootstuff.io/mpp/check","x402":"https://sentinel.rootstuff.io/x402/check"},"usage":"POST JSON {\"url\": \"https://example.com\"} to a payment endpoint. The first call returns HTTP 402 with payment requirements; retry with the payment credential.","operator":"https://sentinel.rootstuff.io","directory":"https://sentinel.rootstuff.io/agents/directory"}