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?
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.