[vijayr]

Where can one get historical and current prices of all crypto currencies as a downloadable dataset, even for commercial use?

[nsomaru]

Not all, but here's a start:

    https://coinmetrics.io/data-downloads/

You can also use the cryptocompare API:

    https://www.cryptocompare.com/api/

[amrrs]

If you are trying to get in R, Current price you can get from this R package coinmarketcapr

[inlineint]

There is https://www.kaiko.com/, they collect and sell bid/ask and orderbook data for most of the exchanges that are active now or were active in past.

[NicoJuicy]

I have a service which has been logging for over a half year somewhere ( probably from coinmarketcap, all known cryptocurrencies). I thought it was updated every 15 minutes

Email me (see profile) and i'll check it out do send it to you.