Lessons from Building a Reliable Public MTProto Proxy Directory

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A developer building mtproto.cloud found that maintaining a public MTProto proxy directory requires treating it as a reliability product rather than a static list of IP addresses. The key challenge is that public proxies frequently go offline, become overloaded, or change latency, making fresh health data more valuable than a large but stale catalog. The project involved separating proxy identity from real-time observations — tracking check time, latency, and failure reasons — while keeping monitoring lightweight to avoid overloading third-party servers. On the user-facing side, the interface prioritizes transparency, showing current status, last-checked timestamps, and clear connection actions so visitors know exactly what they are connecting to. The developer also emphasizes that public proxies are not full VPNs, and that honest product copy is itself a security measure to prevent users from overestimating the protection such proxies offer.

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