{"slug":"probekit-6a4d1a41","name":"ProbeKit","summary":"Check reverse DNS for a domain's mail servers: up to five MX hosts, their IPv4 and IPv6 addresses, each PTR name and whether it resolves back to the same address (FCrDNS), with coded findings. Use when an agent must tell whether a domain's mail servers have matching reverse DNS, a common reason for rejected or spam-filed mail.","status":"live","indexable":true,"listed_since":"2026-10-26T06:01:33.865789Z","sources":[{"source":"x402_bazaar","external_id":"https://api.probekit.dev/v1/mail/ptr","owner_address":"0x5be2be9f95549a2d69951d24a2b3901d1df1bc05","seen_at":"2026-10-27T21:42:53.676027Z","removed_at":null}],"endpoints":[{"url":"https://api.probekit.dev/v1/mail/ptr","host":"api.probekit.dev","protocol":"x402","state":"live","last_probe_at":"2026-10-27T19:10:08.778685Z","last_ok_at":"2026-10-27T19:10:08.778685Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"api-probekit-dev-0d62db6e","name":"api.probekit.dev"}],"payment_options":[{"endpoint_url":"https://api.probekit.dev/v1/mail/ptr","network":"eip155:8453","scheme":"exact","rail":"exact","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","coin":"USDC","asset_label":"USD Coin","amount":"10000","pay_to":"0x5be2be9f95549a2d69951d24a2b3901d1df1bc05","observed_at":"2026-10-27T19:10:08.778685Z"}],"usage":{"source":"x402_bazaar","unique_payers_30d":2,"paid_calls_30d":2,"last_paid_at":"2026-10-26T01:24:16.669Z","reported_at":"2026-10-27T21:42:53.676027Z"},"assessment":{"method":"2026.10.2","checks":[{"id":"answers","state":"pass","reason":"Answered a check within the last hour."},{"id":"owner","state":"fail","reason":"No one has proven control of its domain or of the wallet it is paid at."},{"id":"track_record","state":"fail","reason":"Listed for 1 days; 30 are needed."},{"id":"real_customers","state":"fail","reason":"2 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook); 10 are needed."},{"id":"clean_scan","state":"not_applicable","reason":"Not an MCP server."}],"passed":1,"applicable":4,"contradicted":false,"computed_at":"2026-10-27T19:10:45.810752Z"},"identity":{"endpoint_domains":["probekit.dev"],"proven_domains":[],"proven_wallets":[],"namesakes":[{"slug":"probekit-37bf3ce3","name":"ProbeKit","proven_domain":null},{"slug":"probekit-39391b06","name":"ProbeKit","proven_domain":null},{"slug":"probekit-c72619e8","name":"ProbeKit","proven_domain":null},{"slug":"probekit-2c09174d","name":"ProbeKit","proven_domain":null},{"slug":"probekit-bfd1c09b","name":"ProbeKit","proven_domain":null},{"slug":"probekit-4fcd5ba6","name":"ProbeKit","proven_domain":null},{"slug":"probekit-b0c7dbdf","name":"ProbeKit","proven_domain":null},{"slug":"probekit-3b7eb36c","name":"ProbeKit","proven_domain":null},{"slug":"probekit-4a894523","name":"ProbeKit","proven_domain":null},{"slug":"probekit-8ab7174d","name":"ProbeKit","proven_domain":null}],"namesake_count":13,"identity_checks":[],"wallet_attestations":[],"human_backings":[]},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}