Btc-e is always cheaper. What is the benefit of keeping fiat on the more expensive one?
Edit: How about this (i'm just throwing this out there)....
Hypothetically. People send me bitcoin. I sell half on coinbase and get cash. This is peoples' investment (cash + bitcoin). People assume the risk.
I wire money to btc-e. I buy bitcoin at btc-e (up to the maximum of the amount held on coinbase) and sell the (equivalent bitcoin-50% of calculated gains) on coinbase to take advantage of arbitrage if it exists. I transfer bitcoins to coinbase, and repeat...
The aim of the 50% calculated gains subtraction above is to keep gains in bitcoin and in fiat. The fiat grows at btc-e and grows at coinbase. It prevents the situation of all gains being in fiat.
You know, I wonder if btc-arbs started out as a legit arbitrage but their wire transfers got blocked and delayed so they made up bullshit to cover for it. I've read that often scams start off legit, but then there are problems and they go rogue.
Anyone want to help me turn this thing into a legit business? I could do with a PHP developer, a cat, honda civic, and a Frappucino.
The method is flawed. Here's how to do it...
First, have a balance on the exchanges you want to operate on (BTC-e and Bitstamp being the big two). Keep the majority in fiat, with a VERY small amount in Bitcoin (like 1-2 bitcoin) which you buy at the start of the trading day on the cheaper exchange and transfer it to the higher exchange (this is if you aren't all in Bitcoin due to a confirmed uptrend in price).
When there is an arbitrage opportunity, you buy on the lower exchange in an amount less than or equal to the amount of Bitcoin you hold on the higher exchange, and simultaneously sell on the higher exchange. Transfer the just-purchased Bitcoin to the higher exchange. When it arrives at the selling exchange, if the arbitrage spread is still meeting your percentage requirements, keep doing it until the spread narrows. As the spread narrows or volatility increases you may want to keep Bitcoin in the selling exchange, because every now and then it reverses and the "selling" exchange becomes the "buying" exchange and the process reverses. Doing it this way by keeping the amount of Bitcoin you're holding at any given time small, you limit your exposure to volatility losses.
You would have to pay attention to the moving averages and if Bitcoin starts to move into a sustained uptrend, you'll want to be in Bitcoin and not fiat, and stop arbitrage trading until it goes into a downtrend. Arbitrage is best during downtrends where you don't want to be all-in Bitcoin. But if you're done for the day, tally up your fiat total on all exchanges and compare it to the start of the day, to determine your profit after all the transfer fees and whatnot. Then once in a while you have to rebalance via wire transfer, unless you get lucky and the exchanges approach parity, and you can just move Bitcoin and rebalance that way. Then turn on your automated trading bot (like Butterbot for instance) for the overnight session and walk away.
Has anyone here tried arbitrage for real?
Hypothetically. People send me bitcoin. I sell on coinbase and get cash. I wire money to btc-e, I buy bitcoin. I transfer to coinbase, I sell, there is profit. I wire money to btc-e, I buy bitcoin.
At this time...
$444.75 coinbase sell price
$431.7 btc-e buy price
$45 international bank wire fee
0.2%-0.5% btc-e fee
0.01 btc-e withdrawal fee
X bitcoins
(((X * $444.75) - $45 ) / $431.7) * 0.995 - 0.01 = X
x=4.534534118461 bitcoins for break even
(((X * $444.75) - $45 ) / $431.7) * 0.995 - 0.01 = 1.02X
x=22.393431406065 bitcoins for 2% gain
(((X * $444.75) - $45 ) / $431.7) * 0.995 - 0.01 = 1.025X
x=1454.57777767135 bitcoins for 2.5% gain
The gain can be completely wiped out by volatility (or increased)