According to Mike Silagadze, Ether.fi’s crypto card is offering 10% cashback paid in ETH for a limited time, source: Mike Silagadze on X, Dec 20, 2025. The ETH-denominated rewards structure means card users receive cashback directly in ETH during the promotional window, source: Mike Silagadze on X, Dec 20, 2025. Traders can monitor ETH spot volumes, Ether.fi card adoption signals, and on-chain reward distributions to gauge near-term effects on ETH market liquidity and trading momentum, source: Mike Silagadze on X, Dec 20, 2025.