ERR_SERVICE_UNAVAILABLE, with Retry-After) means the key was not found on the servers that answered but at least one server could not be checked: retry later and do not treat the key as unknown. When an active server cannot be checked, a copy of the key on a legacy server is not reported either (the active server may hold the current one), so that case is a 503 as well.curl --location 'https://tunnelsats.com/api/public/v1/subscription/status' \
--header 'Accept;' \
--header 'Content-Type: application/json' \
--data '{
"wgPublicKey": "pWyZTQx8C4gzzgMVJHiN1ptI46wDtyJSMRa+wxtkXOM="
}'{
"expiry": "2026-10-15T12:00:00Z",
"bandwidth_used_gb": 45.67,
"bandwidth_limit_gb": 100,
"bandwidth_resets_this_month": 0,
"max_resets_per_month": 2,
"status": "enabled",
"server_domain": "de2.tunnelsats.com",
"vpn_port": 24556,
"last_synced_at": "2026-09-01T12:00:00Z"
}