I am not sure if it is integrated with stripe/Google checkout, but I haven't written single line of code and integrated with Paypal. Also lot of plugins are available.
But I'd say, that while the purpose is very similar - quick poll creation, our take on it is a bit different. tally creates a, possibly, fastest possible poll creation method. Ours includes some customisation (not in a design perspective, except for the poll design style); real-time results viewing (both admin and user end); image creation for embeding to sites, forums (that update automatically).
Regarding the "branding" - we've added the logo and a little text "built on ampoll.com" for our poll images so users know where the poll results are coming from. Other than that, we're trying to keep it minimal and not include too many intrusive branding to the pages.
Providing an API is good. Developers would come up with many innovative solutions. One of my friend built an android app to find location based loo finder using the data public domain.
Not sure if you guys are aware about the data sets which are already publicly available.
I am not sure if it is integrated with stripe/Google checkout, but I haven't written single line of code and integrated with Paypal. Also lot of plugins are available.