I came up with this screen layout yesterday. Basically, you browse your available currencies at the bottom part, with the flick of a finger. You can see your current balance for every currency.

Assuming you already selected a person to trade with, and that person is online and accepted the trade request, this is what you will see. At this point, you drag the requested currency to the top area, and click the (+) or (-) buttons to increase or decrease the value traded.

The person on the other side does the same thing, but you both see this happening in real-time. The application also calculates the exchange rate for you and puts it in a comment at the bottom of the trading area.

When both sides are OK with the trade figures, both need to tap the “Trade” button next to the name of the person. This user interface allows for some sort of “Haggling” to take place :-)

I would love to get comments on this. Also I think it would be useful to add a “Trade Chat”, so you can actually talk about the trade taking place. This chat would be recorded by default (with a “Go off the record” option), and be linked with the trade, for future reference.

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