You can send query via REST for currency fx rates
SELECT
id,
BUILTIN.DF( baseCurrency ) as BaseCurrencyName,
BUILTIN.DF( transactionCurrency ) as TransactionCurrencyName,
effectiveDate,
exchangeRate,
fxSourceMethod
FROM
CurrencyRate
WHERE
id IN (
SELECT
MAX( id )
FROM
CurrencyRate
WHERE
effectiveDate = '4/18/2024'
GROUP BY
effectiveDate, baseCurrency, transactionCurrency
)
ORDER BY
BUILTIN.DF( baseCurrency ) DESC, BUILTIN.DF( transactionCurrency )