According to @MikeSilagadze, ether.fi card users have two days left as of Dec 21, 2025 to receive 10% cashback paid in ETH, source: @MikeSilagadze on X, Dec 21, 2025. The announcement specifies that rewards are denominated in ETH, linking the promotion directly to Ethereum (ETH) usage during the stated window, source: @MikeSilagadze on X, Dec 21, 2025. Traders focused on ETH-denominated rewards and on-chain spending incentives can note the time-bound nature of this offer as disclosed, source: @MikeSilagadze on X, Dec 21, 2025.

According to @MikeSilagadze, he paid $500 to Boost a post on X that was advertised to reach 150k views but delivered lower engagement than his typical posts; source: @MikeSilagadze on X, Dec 20, 2025. He further reported critical ad platform failures—adding a payment method, importing an audience, adding a mobile app for tracking, target audience exclusions, and boosting posts—calling the product beyond broken; source: @MikeSilagadze on X, Dec 20, 2025. For traders allocating crypto marketing budgets, this user-reported underperformance and instability on X warrants reassessing spend efficiency and channel mix until reliability is demonstrated; source: @MikeSilagadze on X, Dec 20, 2025. He also highlighted ether.fi’s card with a limited-time 10% cashback paid in ETH, signaling an active promotion that ETH-focused marketers and traders may monitor; source: @MikeSilagadze on X, Dec 20, 2025.

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.

According to Mike Silagadze, ether.fi is offering EF Devcon attendees in Argentina a 20% cashback on everything purchased using the ether.fi card during the event (source: Mike Silagadze on X, Nov 17, 2025). He also highlighted a free asado perk included with the same campaign (source: Mike Silagadze on X, Nov 17, 2025). No additional eligibility rules, caps, or timeframe were disclosed in the post, so the confirmed terms are the 20% cashback on all purchases via the ether.fi card and the free asado for EF Devcon attendees in Argentina (source: Mike Silagadze on X, Nov 17, 2025).