Launch the Crypto Time Series Analyzer

Starts an interactive 'shiny' application for exploring cryptocurrency exchange rates and market data from 'CoinMarketCap'.

Usage

crypto(
  api_key = Sys.getenv("COINMARKETCAP_APIKEY"),
  analytics = FALSE,
  keep_alive = TRUE,
  ...
)

Arguments

api_key: A 'CoinMarketCap' API key, needed for the market listings. By default it is read from the COINMARKETCAP_APIKEY environment variable, which can be set in .Renviron.
analytics: TRUE to add Google Analytics, through the cookie banner shared with the sites of sedzinfo.github.io, which loads it only after the visitor accepts. Meant for the public deployment (see app.R); off by default, so that running the app yourself sends nothing.
keep_alive: TRUE (the default) to ping the server every 15 seconds while the page is open, so that proxies do not close idle connections. FALSE lets the app go to sleep when nobody uses it, as app.R does on shinyapps.io, where an app that stays awake uses up the active hours of the plan.
...: Further arguments passed to shiny::shinyApp(), for example options = list(port = 8080).

Value

A shiny::shinyApp() object. Printing it, or calling crypto() at the console, opens the app in the browser.

Details

The application has the following tabs:

Timeseries: Candlestick chart of daily open, high, low and close prices in USD since 2013 for any active cryptocurrency, with its 50- and 200-day moving averages, and charts of the volume and of the drawdown (how far the price is below its all-time high) underneath.
Top 100: Table of the top 100 cryptocurrencies by market cap with price, volume, 24h to 90d price changes, market dominance and fully diluted market cap.
Compare: Close prices of up to 10 coins, normalized to 100 on the first date all of them have data.
Treemap: Top 100 coins sized by market cap and colored by 24h change.
Returns calendar: Monthly returns by year for the coin selected in the Timeseries tab.

Market listings are downloaded when the app starts and refreshed every 10 minutes. Historical prices are downloaded on demand with crypto2::crypto_history() and kept on disk between R sessions, so after the first download only the days since the last one are fetched. An internet connection is required. When 'CoinMarketCap' limits the requests, crypto2 prints "Retrying in 60 seconds" and the chart appears about a minute later.

Examples

if (interactive()) crypto()

# with the API key passed directly, on a fixed port
if (interactive()) crypto(api_key = "your-api-key", options = list(port = 8080))