What are best sites that allow to short BTC on margin?

[theonewhowaskazu]

Bitfinex allows x4 margin.

BTC.sx allows for larger margins but I don't remember how big.

BTC.sx is 1:10.
Anyone use it? Any comment about this one?

I've tried it, it works in general but there are some annoying things about it.

First it looks as if they have some kind of weird margin call system which means that you can never lose more than a specific amount on a trade, rather than just losing your entire account balance. Not sure what the point of that is. Interest is counted for this margin call system.

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[meh32123]

bitfinex is limited to 1:2 atm.

[Faraday]

bitfinex is limited to 1:2 atm.

Not to mention they never have USD reserve to buy on bitstamp lately.

[notme]

bitfinex is limited to 1:2 atm.

Not to mention they never have USD reserve to buy on bitstamp lately.

OP wants to short.  This should open up some USD.

[byronbb]

Avatrade http://www.avatrade.com/ allows 5x margin and Plus500 http://www.plus500.com/ 4x margin for CFD's on BTC/USD.
Edit: US persons need not apply

I use plus500, it is far more friendly user, but they lowered the leverage from 10 to 4...

Avatrade, leverage of 1:5 with a margin of 20%
Plus500 1:4 but only ask 10%, I just hope they will increase the leverage soon.

Is plus500 legit? They seem a bit off to me

It seems like it would be really easy to screw that site over by manipulating Goxs price. Sorta surprised nobody has tried yet.

Ya I thought this too. I watched their spread vs the orderbook a few times and it appeared to me they weren't even watching the depth, so you really could wait for a thin buy or sell side on gox and go short or long respectively.  You could also wait for large spreads between gox and bitstamp and go short gox price with plus500 and long bifinex or avatrade and basically  play the percentages of an eventual convergence.

[theonewhowaskazu]

Avatrade http://www.avatrade.com/ allows 5x margin and Plus500 http://www.plus500.com/ 4x margin for CFD's on BTC/USD.
Edit: US persons need not apply

I use plus500, it is far more friendly user, but they lowered the leverage from 10 to 4...

Avatrade, leverage of 1:5 with a margin of 20%
Plus500 1:4 but only ask 10%, I just hope they will increase the leverage soon.

Is plus500 legit? They seem a bit off to me

It seems like it would be really easy to screw that site over by manipulating Goxs price. Sorta surprised nobody has tried yet.

Ya I thought this too. I watched their spread vs the orderbook a few times and it appeared to me they weren't even watching the depth, so you really could wait for a thin buy or sell side on gox and go short or long respectively.  You could also wait for large spreads between gox and bitstamp and go short gox price with plus500 and long bifinex or avatrade and basically  play the percentages of an eventual convergence.

They're not even watching spread, let alone depth. A person with a good 50ish coins could probably make a bundle there, by pushing the goxxian price around, and lower their gox commission as well.