Clearing furms in the strict sense do exactly that: they keep electornic "paperwork" regarding your trades. To use a clearing firm you need your own market access (presumably as an exchange member) and your own source of credit (if you need leverage).Quote from Option Trader:
What about the possibility of establishing a relationship directly with the clearance firm (I saw this idea on Google)? Is there any such idea available without having to have millions?
There are a number of firms that specilise in services to prop firms and actively trading hedge funds. These would let the customer choose services the customer needs: clearing, execution, credit. From what I hear a few hedge funds execute via interactive brokers (for access to a wide range of markets) but use an independant clearing firm (for lower clearing rates and more favorable portfolio margin).
To get an account with a major investment bank you need $5m to get them interested but I'm sure independent firms are much more moderate in their expectation.
Note clearing firms may not provide any paper-trading facility. If they do execution, they would offer a simulated trading environment to test the trader's own trading software but this simulated environment wouldn't provide real market prices or P&L calculation.
