https://arbitool.eu/incoming-features/ error is because we changed our landing page and still working on this part. We will fix it very soon.

Why does it show negative trades?  - We gather data from exchanges in 2 parts/moments  first we gather prices to show you guys price differences in main screen where you see all arbitrage opportunities, but here we gather this data once for 30 seconds - 1 minute sometimes if there are lags in communication with exchanges it can take little more. Next time when we gather data is when you press DETAILS button. When you press the button in the same moment we asking exchange about all data once again so. So after you press DETAILS button you see the newest data, there can be situation like on yours picture, this is when situation on exchange has changed and there is no arbitrage opportunity any more on this pair.