Recently, I’ve looked into investing in start-ups with venture capital. Last year, the SEC allowed non-accredited investors to invest up to $2200 per year in start-ups through online sites. (Accredited investors can invest much more). You can put as little as $100 and in some cases as little as $20 into an offering for future equity, convertible notes, stock, or loans paid with interest.
The three sites that I find most convenient are:
Microventures vets its companies more than most and has the pedigree of investing in Twitter, Facebook, Yelp and many others before they went public.
Republic.co takes credit cards with no additional fee. The other two charge $7 minimum up to 2%.