Is there exchanges that don't approve arbitrage?

[sevynos]

I developed a web page that shows me arbitrage opportunities between some exchanges that I currently trade on. What I noticed is that most of the time the good opportunities (10%+) have one of the two wallets (exchange1 or exchange2) which is under maintenance.

So the question is: Does the exchanges do this on the purpose of preventing arbitrage or it's only bad luck that I had since using my arbitrage web page?

[yinyangwinwang]

I am pretty sure they try and prevent the more obvious arb ones like 10%+ and that is to maintain liquidity on their own website. I have tried myself before but frequently come across maintenance as well. The ones that aren't in maintenance are the ones from 1-5% range generally but those require more capital obviously to make your target for arbing. Bottom line it isn't you it is the websites that stop this behavior as much as possible.

[sevynos]

Regarding liquidity, I could understand the exchange with the lower price as your would take your money away.  But the exchange with the higher price should be glad to have people get their money in and charge transaction fees on the sell they're gonna do on their site and eventually on a subsequent withdrawal!