XLMUSD is the market symbol for Stellar lumens (XLM) priced in US dollars, where XLM is the native asset of the Stellar payment network and USD is the US dollar. The quote shows how many US dollars buy one lumen. Stellar is a network built to move money quickly and cheaply across borders.
Exposure to XLMUSD comes through a crypto CFD, a position on the price that involves no token ownership and no wallet. Go long if you expect lumens to rise in value, or short if you expect them to fall. The pair is quoted in US dollars and trades continuously, and like most smaller-cap coins it can be highly volatile.
XLM's price moves on adoption of the Stellar network for payments and remittances, partnerships and integrations, regulation, and general crypto sentiment. Stellar is frequently compared with XRP, since both aim to speed up cross-border transfers, but they run on separate networks and are distinct assets.
Say XLMUSD is trading at 0.12 and you expect a rise, so you go long 50,000 XLM. The price moves to 0.15, a gain of 0.03 per lumen, so your profit is:
0.03 √ó 50,000 = USD 1,500
Had XLMUSD fallen to 0.09 instead, the same 0.03 move per lumen against you would have cost USD 1,500.