Finance-aware calendars

Track currency pairs as calendar events.

Use exchange feeds for personal finance, travel, reporting routines, and low-level dashboards.

Example URLs

/api/exchange?base=USD&target=BRL&lang=pt-BR&emoji=true
/api/exchange/io/events/summary.txt?base=USD&target=BRL&lang=pt-BR&emoji=true

Shared demo source

The demo calendar uses one super-node snapshot instead of repeated provider calls.