Returns the listings of the coins by market cap, with their price, volume, price changes from 24 hours to 90 days, market cap and dominance in USD. The listings are downloaded again when they are older than 10 minutes, and the download is shared by all sessions and app runs in the same R process, so the API is called at most once in that time.
Value
A list with data, a data frame with one row per coin sorted by
market cap, and time, when it was downloaded.
Details
The listings need a 'CoinMarketCap' API key in the COINMARKETCAP_APIKEY
environment variable, see the README. The first download lets errors
through. When a later download fails, the previous listings and their
time are kept, so the time stays truthful.
Examples
if (FALSE) { # \dontrun{
listings <- get_listings()
listings$time
head(listings$data)
} # }