We've seen a dramatic rise in the cost of our servers that run the back tests in the recent weeks. It is the largest cost for QuantConnect so we do our best to keep the costs low while maintaining reliable service.

Recently there has also been a tulip style rise in the price of BitCoins - the anonymous currency which relies on server farms to "mine" the coins.

Which happens to correlate well with the sudden spike in the price of Amazon Servers:

Coincidence? Or have BTC miners taken over Amazon Spot Servers? :)