Bitcoin Holds Above $74,000 as Spot ETF Inflows Extend Ahead of FOMC; SIREN Jumps on AI and DeFi Options Theme

Bitcoin traded above $74,000 on March 18, 2026, as spot ETF inflows remained strong ahead of the Federal Reserve's FOMC meeting, ChainThink Strategy Research Institute reports. Data for March 17 showed Bitcoin spot ETFs recorded net inflows of $199 million and Ethereum spot ETFs added $138 million, marking seven and six consecutive days of inflows respectively, with BlackRock's IBIT, ETHA, ETHB and Fidelity's FBTC among the main beneficiaries. The market focused on potential shifts in rate-cut expectations and energy-inflation commentary from Powell, as the U.S. Dollar Index hovered near 99.69 and the 10-year Treasury yield stood at 4.20% on the morning of March 18. SIREN (Siren Protocol) gained over 17.85% on the day, breaking above $0.81 and briefly touching a record $0.869, supported by AI Agent narratives on BNB Chain and rising demand for decentralized options hedging, while on-chain data showed some participants realized profits above $0.75.