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I'm not sure what your definition of "alot of different coins" is, but i believe Poloniex is currently the exchange with the lowest minimum trading amounts, ( atleast of all the ones that are currently open for registration).
The minimum there is 0.0001BTC -- 10.000 satoshi.
Also, this thread is in the wrong section. You should move it to a section like this, https://bitcointalk.org/index.php?board=223.0
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thx for the reply, can i move this thread by myself?
You can also check Liqui and perhaps Kucoin and Novaexchange. I'm not sure though...
Good luck anyways.
Novaexchange is exactly what iam looking for - unfortunately the exchange closed. Any more hints like this?