Yeeeaah, this sounds like a bad idea, OP. Ditch and get someone who is more than an 'idea guy'. Non-technical project founders are way too common in indie game development. No art skills, no programming skills, just ideas and a 'management mindset'.

Also, you should ask him to define API, then let him go for being a bad match for the project due to lack of technical skills. Waste no time on such people.