Claude Pro/Max plans expose a usage API at https://claude.ai/api/oauth/usage that returns two utilization counters:
five_hour.utilization— a rolling 5-hour window (well documented)seven_day.utilization— described as a "weekly" cap
The seven_day object also contains a resets_at field. Monitoring this field over ~11 days (June 9–20, 2026) revealed that the "weekly" limit does not reset every 7 days — it resets every 72 hours.