Woofun AI reports that cryptocurrency analyst Nikita conducted a simultaneous €9.69 spending test on six European crypto payment cards, including Ether.fi, Plasma, Backpack, Lava, Jup Mobile, and KAST. Ether.fi recorded the lowest actual cost of $10.72, ranking first, while Plasma placed second at $10.93 and Backpack third at $11.07. The results indicate that total costs vary by approximately 5% across providers, primarily influenced by exchange rate spreads, transaction fees, and cashback structures. Ether.fi's leading position stems from favorable exchange rates and on-chain cashback, whereas KAST emerged as the most expensive option due to poor exchange rates and additional fees.