Package-level declarations

Access to Alpha Vantage's digital and physical currency exchange rate endpoint, reached through exchangeRate.

Unlike the other domain packages, this one has no separate request/ response split: com.crazzyghost.alphavantage.exchangerate.ExchangeRate collects the currency pair via fromCurrency(String) and toCurrency(String), com.crazzyghost.alphavantage.exchangerate.ExchangeRateRequest carries the built CURRENCY_EXCHANGE_RATE parameters, and com.crazzyghost.alphavantage.exchangerate.ExchangeRateResponse holds the quoted rate together with the bid/ask prices, where the API has an order book for the pair.