Create a calendar event (free on every tier; daily-create cap)

Create a calendar event. No tier gate (free). One gate: a rolling-24h create cap enforced inside the helper → 429.

Body (JSON): { "title": "Quarterly portfolio review", # required, <=120 "event_date": "2026-06-30", # required, ISO YYYY-MM-DD "note": "rebalance + tax-loss harvest", # optional, <=2000 "ticker": "NVDA", # optional, <=16 "event_time": "09:30", # optional HH:MM[:SS] "recurrence": "monthly", # optional none|daily|weekly|monthly|yearly "recurrence_until": "2027-06-30", # optional ISO "remind_offset_minutes": 1440 # optional 0..10080 }