for entertainment and educational purposes only.
For running on Vercel, note that it uses the vercel version of node which won't run anywhere else
bitfinex daily close data: https://www.investing.com/crypto/bitcoin/btc-usd-historical-data
see https://github.com/bitkarrot/BTCDailyPoll (cron to update daily close for btcusd & btchkd rates)
cronjob is on github actions, see action.yml