Deploy lightweight UDP or HTTPS ping endpoints (QoS beacons) in each of your target datacenter regions; these endpoints need only echo a response with minimal processing.
On the game client, asynchronously send multiple probes (e.g., 5 probes) to each regional beacon; measure round-trip time for each probe and compute median or weighted average to reduce outlier impact.
Send the client's per-region latency measurements to your matchmaking backend as part of the matchmaking ticket attributes, not as a trust-me value but as a preference signal.
On the matchmaking backend, combine client-reported latencies with server-side verification (where possible) and apply a maximum acceptable latency threshold to filter out regions that would produce poor gameplay.
Implement a fallback: if client QoS collection fails or times out, assign the player to a default region rather than blocking ticket creation; log the fallback for monitoring.
Periodically re-run QoS probes during the session (e.g., between matches) to detect network condition changes and update region preferences for subsequent matchmaking tickets.
Known gotchas
Client-reported latency is untrustworthy for security decisions; use it only as a preference hint for quality-of-service, never as an authoritative measure to gate access.
UDP probes may be blocked by firewalls or NAT devices; always provide an HTTPS fallback beacon and detect which protocol succeeded for each client.
Averaging latency probes without outlier filtering can be skewed by a single packet loss event; use median or trimmed mean and discard the highest outlier in each probe set.
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp