Methods for working with fiat prices.
Get exchange rates from a rate provider
{
from: <From Rate Provider String>
request: <Request Function> {url}, (err, {statusCode}, body) => {}
symbols: [<Fiat Symbol String>] // empty defaults to USD
}
@returns via cbk or Promise
{
tickers: [{
date: <Rate Updated At ISO 8601 Date String>
rate: <Exchange Rate in Cents Number>
ticker: <Ticker Symbol String>
}]
}