Where can I get API data?

I have a charting software used by a small group of traders. Currently it's EOD data. We want to make it RT (real time) or 20min delayed. I'd like a wide variety of data (stocks, ETF's etc). I understand that I will have to pay exchange fee's etc if it's RT.

Where can I get a API for data at? I want something that's stable and is priced reasonable.

Please PM if you don't want to write it here. Thanks.
 
Right now,I'd like something around $50 a month for the data and then any additional exchange fee's. If someone has some recommendations priced higher/lower I'm pretty open. Any help would be appreciated.
 
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