http://www.collective2.com
People can subscribe to your system there and you have a number of ways you can charge. One advantage of using them is that you have an independent auditor of your results. Another is that they do all of the billing for you.
Unfortunately, not free.
But even if you decide not to use them, you can still get some idea of what other people are charging for their methods — while seeing what kinds of results they are generating for those charges.
P.S. I hope by "developing a trading strategy for the last 6 months", you don't mean you've been tweaking historical data to generate those results. There have been a few systems on Collective2 that looked great in their presentation of backtest results, but failed miserably going forward.
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