What are good brokers that offer a trading API I can program against?

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Volpunter, in your opinion: is it really worth to develop in IB-Fix vs IB-Api ? I'm aware that Fix protocol is really hard for a non professional programmers, perhaps outsourced is the solution, but I want to know if it really outperforms Api , what do you think ?

Is there really a practical superior performance trading from your own Algo whitin API Vs Commercial trading platform which actually connects to your api in your local pc ?

Thanks

Volpunter was banned. Try asking under his new handle zzz1 or something like that. Just look for the guy trolling every thread he's in and you'll find him.