get_exchange_rate
Exchange rate
Returns the current mid-market exchange rate between two currencies as the number of units of to_currency per one unit of from_currency, with the time it was read. Use it to answer how much one currency is worth in another. It does not say whether Morse can send money in either currency; use list_send_destinations for that. The rate is indicative; show get_started_url as the way to continue in the Morse app, where the rate applied to a transfer is shown before the user confirms.
to_currency必填from_currency必填