Ask HN: Will you donate to an NGO while shopping online?

We are working on a crowdfunding site but with a different feature , instead of people going to a crowdfunding site and donate to a cause , Will people will be interested in rounding up their buying amount ot a nearest dollar while shopping online and donate to an NGO ?

Most of the people on HN shopped online once or twice minimum and will you mind donating some cents to an NGO you like ?