Excellent observation, once again! If this continues, that's a pretty good arb opportunity for us between Stamp/BTCe and Bitfinex!
On that note, do you have personal experience with Bitfinex Mat? I have a fully registered account with them, just wasn't sure about their fiat funding/withdrawal times?
I don't trust Bitfinex. I have witnessed short trade stop loss orders being placed behind 1K Ask walls, right at top of market as market started slipping away, only for Bitfinex to spike right up through supposed 1K wall on very little volume, and my stop loss buy orders actually being the very top of the market. I have also witnessed spot on Bitfinex running $5 past my buy-in orders, only for my orders to be left untouched. I have felt somehow unjustly robbed on more than one occasion on Bitfinex.
Bitfinex are players for sure, and they are players with access to all manner of information that players shouldn't have access to, and with absolutely no regulation or oversight.
Spend any amount of time looking at the charts for these wild erratic spikes and dips that don't conform with the market, and you will notice that they only ever happen on Bitfinex, BTC-e, and of course the CNY exchanges. I think that there will be good reason's for this and these reasons stink of piss. The most obvious example looking over the chart history is the BTC-e and Bitfinex crash to $100. Not saying it was 'exchange insiders' that perpetrated. It seemed to me to be rather more like someone had hacked the exchange fake volume bots or something. But lots of real money was lost and lots of people who had buy-ins way down in these lower hundred ranges were overlooked as spot price zipped right down and then right up past their buy in tranches. Again, it all stank of piss and shit and it never ever happens on Stamp.
Cheers for that Matty, good to hear reports/experiences from actual users! Yeah, I mean wouldn't be interested in their stop/loss or leverage trading. Just if their spot price fills my order, then that's ok.
Even on Bitstamp, when my order price hits, it doesn't always complete - especially for larger orders and I have to re-adjust the price for the remaining fiat
I'm not sure about the whole price manipulation thing, but at times it certainly looks that way.