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I represent to your attention Fast Crypto-Currency trading platform https://vircurex.com

Trades on the following pairs:

BTC / EUR
BTC / USD
ANC / BTC
DGC / BTC
DOGE / BTC
DVC / BTC
FRC / BTC
FTC / BTC
I0C/BTC
IXC / BTC
LTC / BTC
NMC / BTC
NVC / BTC
NXT / BTC
PPC / BTC
QRK / BTC
TRC / BTC
WDC / BTC
XPM / BTC

A distinctive feature of this trading platform is that you can trade currencies specified in any variations! You can, for example, trade DOGE for NXT directly, without involving in the process BTC. It's enough in the account settings window uncheck "Show only BTC Exchange".

There is a nice information panel, where you can see the current number of blocks, network hashrate and current difficulty for all traded currencies.

Commission for the buy / sale: 0.2%

After orders, do not forget to activate it by clicking the "Release" button.

Fees for withdrawal your coins (no commission for the deposits):

Currency / Commission (number of coins) / Number of required confirmations in the network
ANC - Anoncoin / 0.1000 / 10
BTC - Bitcoin / 0.0020 / 4
DGC - Digitalcoin / 0.2000 / 80
DOGE - Dogecoin / 5.0000 / 10
DVC - Devcoin / 100.0000 / 6
FRC - Freicoin / 1.0000 / 10
FTC - Feathercoin / 0.0100 / 6
I0C - I0coin / 0.0100 / 6
IXC - Ixcoin / 8.0000 / 10
LTC - Litecoin / 0.1000 / 4
NMC - Namecoin / 0.1000 / 6
NVC - Novacoin / 0.1000 / 10
NXT - Nextcoin / 2.0000 / 50
PPC - Peercoin / 0.0200 / 6
QRK - Quarkcoin / 0.5000 / 10
TRC - Terracoin / 0.0100 / 10
WDC - Worldcoin / 0.1000 / 10
XPM - Primecoin / 0.0100 / 8

Also, the Exchange gives you the opportunity to customize receive messages to a specified e-mail when your account receives a deposit and when your order is executed.

I note that trading platform is very quick, there is no lags, such as on Cryptsy or CoinedUp. Withdraws and deposits never takes more than 10-15 minutes (4-10 confirmations, depending on the currency), which is also important in arbitration.

Transfer coins from the one market to another market is very easy. Generate the address on one market and withdrawal from another, and the funds are credited to the address after the confirmation in the network.

Vircurex applied all modern measures to protect your account from hacking. In your account settings, you can configure two-factor authentication by checking on changing IP (on each IP change comes an e-mail for confirmation), by Google Authenticator or Yubikey (authorization from USB-drive).

Joining is simple (note that in the password necessary to have uppercase and lowercase letters, numbers and special characters). Immediately after registration letter with a link to confirm your e-mail comes to the specified e-mail. Need to pass on this link to complete registration. You need to confirm your e-mail by clicking the link.
Account verification is not required.
Vircurex have an API.

And finally. Vircurex pay interest to members, which is available in the accounts 1BTC/100LTC/400PPC in 15% of all commissions earned by the market every 6 hours (by apportioning 15% of all accounts that meet the specified conditions).