From UO Excelsior Wiki - Ultima Online Free Shard
Excelsior Dollars (ED) are a type of in game currency received through donation to the shard, and in game events.
These can also be purchased from other players with gold.
Be sure to check the current price of EDs, by typing [exex and viewing the market rates!
Items & Services Offered For ED
To see some of the items you can purchase with your ED simply enter the white gate in front of Trinsic Bank or visit this link: [ED Rewards]