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Yes, I made 40% ROI in 2 months using the Coinbase API (buy when threshold met or price < x, sell when threshold met or price > y).

Just add in some kind of intervention system is the sell/buy is high because the volatile nature of the currencies can see major drops/gains which can cause all sorts of bother.

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How did that 40% compare to the overall change in price? Bitcoin has gone up 100% over the last 2 months.

He may have risked less than holding bitcoin.

Thanks. I was going for coinbase API, but are there any other better API services? Also, I don't see pricing, I am assuming its being compensated by the trade execution fee. Is that the case?

I've been fooling around with the GDAX API which might be what OP meant, since GDAX owns Coinbase. Maybe. I guess you might be able to use GDAX directly.

Anyway, it is a pretty good API that is directly tied into the exchange, so you are fairly close to the data.

There is no pricing, just fees. Fees are fairly low.

For higher frequency trading (does not seem like what OP was doing) it can matter, but if you're trading on 5-10% change, well, it won't be a big percent of your earnings.

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