Percent change, you mean you want the equivalent from the original CMC JSON:

        "percent_change_1h": "XXX", 
        "percent_change_24h": "XX", 
        "percent_change_7d": "XX",

We can add that, but we want to use fixed points in times, to avoid floating periods comparison.

Here is an example for the change in 1h: it is 10:45 AM, so do the average for 10AM, do the average for 9AM, see the percentage change.

A bad method is to average from 10:45AM to 9:45AM, average from 9:45AM to 8:45AM then report the percentage change, because if there was a big change at 9:30, and just one, then the coin is stable, it will have decaying effect on the percentage change. You will see it moving, while the coin has stabilized! To me, that's wrong.

Coinmarketcap was doing the latter. We can support that, but you should consider switching.

what CMC does is what everyone does, i think it's the standard method. From your frontpage it seems u already have those values somewhere

We have many values, but if we think they may mislead people, we don't show them. It is our ethics. We do not want to do what everyone does.

We will show more coins when we think we can show non misleading data. It's a question of trust. We want happy visitors and happy clients. We want to earn their trust.

Thanks for a lot for using our data on coinzaa! We would appreciate a link, but only if you feel like it.

i have 2 links. one in the frontpage and one in the footer . I also run an ad banner to your site

wow 2 links, we didn't ask that much :-)

I really appreciate. We will work on having the percentage change online for you in the API as soon as possible.