Tradier.com is another one. They have an API for developers. It's not as mature as IB, but if you are looking to start/play with something with no/minimal initi

Tradier.com is another one. They have an API for developers. It's not as mature as IB, but if you are looking to start/play with something with no/minimal initial investment check it out - https://developer.tradier.com https://developer.tradier.com I know that instavest.com (YC company) is powered by them as well.