Topic on Project:Support desk

Can Wikipedia API be used for commercial purpose ? Is there a link to the copyright terms and condition?

Which "Wikipedia API" (link)? What is a "commercial purpose", and do you refer to the API use itself, or to the content being used? For the latter, the content has a license, so see its license linked on any page.

for the main action api (api.php Note:there are other apis too) see https://www.mediawiki.org/wiki/API:Etiquette You also have to comply with Wikimedia's general terms of use for anything to do with the site. The content returned by the api is usually copyrighted and you have to comply with the license. Generally this allows commercial use subject to certain conditions. Different wikimedia sites have different licenses so you have to be specific.

So probably yes, but there are some specific details you have to comply with, and the specifics depend on which api you mean specificly.