Three French brokers allows MONEP trading.
-FIMATEX is the more institutionalised, being a division of SG.
Allows electonic and phone trading, 6000EUR minimum to open an account
-StartFinance is the best out of the three.
Electronic and phone MONEP, 15000EUR /accnt.
It is also the best and cheapest for stocks.
-Wargny is high quality in matter of customer services but you can only trade futures by phone (even if you phone directly to the operating desk) 15000EUR/accnt
IB offers MONEP trading : 3750$/FCE contract
and I like the fact that the guy at the French customer support actually speaks French
If you are not European and trained to trade these kinds of stocks, I strongly suggest that you stay away from stocks.
The FCE, in the other hand can be a good bet.
Clearing firm can be intern, Euroclear or not required(MONEP).
By the way, why do you want to know ?

Are you in Europe ? Or intending to trade the Euro markets while Californians are sleeping ?
In this case let me know, I could introduce you to my team's yahoo chat...
We do an average of 250 pts/mo/ctrct on the FCE and could be interested by having an US trader aboard
C2