When visiting Mount Everest, it's recommended to carry Nepalese Rupees (NPR) for local transactions. While some establishments may accept USD, it's advisable to exchange currency for better value. In Kathmandu and other major cities, ATMs are readily available, but their presence may be limited in more remote areas. Credit cards are accepted in some upscale hotels and restaurants, but cash remains the primary mode of payment. Mobile payment options are not widely used, so it's best to rely on local currency and cash when exploring the region.