CZEONIA — the Czech Overnight Index Average (the reference rate for actual overnight CZK interbank deposits) for a given day. Returns validFor, the overnight rate (percent) and traded volume in CZK millions. Omit `date` for the latest. Verified live.

ČNB official daily exchange rates against the Czech koruna (CZK) for a given day. Returns one entry per listed currency (~30 currencies, e.g. USD, EUR, GBP, JPY) with country, currency, currencyCode, amount and rate. The rate is CZK per `amount` units of that currency. Omit `date` for the latest published rates. Verified live.

Daily ČNB exchange rates for ONE currency across a whole month — a per-currency time series against CZK. Returns currencyCode, amount, validFor (YYYY-MM-DD) and rate for each working day in the month. Use this to chart or compare a single currency over time. Verified live.

Monthly average exchange rates for ONE currency against CZK, across all available years. Returns month (e.g. "JAN"), year, currencyCode, amount and average. Useful for historical trend/year-over-year comparisons of a currency vs CZK. Verified live.

PRIBOR — the Prague Interbank Offered Rate (CZK money-market reference rates) for a given day. Returns one entry per tenor (period: ONE_DAY, ONE_WEEK, ONE_MONTH, THREE_MONTH, SIX_MONTH, ONE_YEAR, etc.) with the pribor rate in percent. Omit `date` for the latest. Verified live.