What is XLM? 

In your list of balances, you’ll see an entry for XLM. Vibrant is built on the Stellar blockchain protocol. XLM, or the “lumen” is the native asset of the Stellar blockchain protocol. It’s a cryptocurrency that acts as an intermediary asset when making exchange transactions, and you can also send and receive lumens the same way you might with other digital assets like ARST or USDX. You can read more about the history of the lumen here.