Since MtGox disabled coupon codes many arbitrage guides become obsolete. When I advice to do the arbitrage people ask me how do I get USD back from MtGox to BTC-e.
You don't have to transfer USD from MtGox to BTC-e in order to do the arbitrage and it's possible even with no coupon codes. However this makes the arbitrage more difficult and long. But this is the good way to earn profit during a long-term and slow down-trend with minimal risks. You just need a patience and accuracy to do this, and some USD.
First of all, here are the fees you should take into account:
1) Buy and Sell Bitcoins on BTC-e: 0.2% + 0.2% = 0.4%
2) Buy and Sell Bitcoins on MtGox: 0.55% + 0.55% = 1.1%
3) BTC-e to MtGox transfer fee: 0.001 BTC
4) MtGox to BTC-e transfer fee: 0 – 0.0005 BTC (pay it if you need your transfer to be completed quick to minimize the price change risk)
So in total your direct and reverse arbitrage transaction margin should be greater than 1.5% in order to be profitable.
Also I assume you avoid keeping too much Bitcoins to avoid the price drop risk so you are mostly in USD.
How to proceed:
1) Calculate the average difference between MtGox and BTC-e Bitcoin price for the last 3-4 weeks. Let's assume it is equal to 4% at the moment with the Bitcoin price at MtGox higher than at BTC-e
2) Calculate the current price difference between MtGox and BTC-e. We will consider two examples: when the difference is 2% lower than average and when the difference is 0.5% higher than average.
Case 1: If the current price difference is lower than average you should transfer funds from MtGox (the source exchange) to BTC-e (the target exchange) if you have any. If you have no funds on MtGox then just wait for a case 2. It could take 1-2 weeks.
Case 2: if the current price difference is higher than average you should transfer funds from BTC-e (the source exchange) to MtGox (the target exchange). If no funds on BTC-e – wait for the case 1.
How to transfer funds:
1) Buy Bitcoins on the source exchange – do this as low as possible to avoid the volatility risk, place a buy order, do not fulfill a sell order.
2) Transfer Bitcoins from the source exchange to the target exchange. It usually takes 10-30 minutes.
3) Sell Bitcoins on the target exchange – do this as high as possible, place a sell order, do not fulfill a buy order
The example given:
1. Week #20, Bitcoin price at BTC-e = $100, at MtGox = $102, difference=2%, average difference = 4% (MtGox higher)
2. You have 1000 USD at MtGox.
3. You buy Bitcoins at MtGox and transfer to BTC-e: $1000 – 0.55% = $994.5, $994.5 / 102 = 9.75 btc, 9.75btc – 0.005 btc = 9.745 btc.
4. You sell Bitcoins at BTC-e: 9.745 btc * $100 = $974.5, $974.5 – 0.2% = $972.551. So far you have loss of $27 (2.7%)
6. You wait 2 weeks when Bitcoin price on BTC-e is $90 and on MtGox is $95, difference=5.5%, average difference = 5%.
7. You buy Bitcoins at BTC-e and transfer to MtGox: 972.551 – 0.2% = $970.61, $970.61 / $90 = 10.7845 btc.
8. You sell Bitcoins at MtGox: 10.7845 btc * $95 = $1024.5275, 1024.5275 – 0.055% = $1018.8926.
So here are your $18 profit (1.8%). In fact you can gain up to 7% if you are patient and accurate!
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