Today's Hot Topics:
1. The Federal Reserve keeps interest rates unchanged;
2. The S&P 500 index breaks the 7,000-point mark for the first time;
3. Fidelity will launch the stablecoin FIDD on Ethereum;
4. Crypto PAC Fairshake's cash reserves rise to $193 million;
5. Powell: Most of the inflation exceeding expectations comes from tariffs rather than demand;
6. Tesla did not make any adjustments to its Bitcoin holdings in the fourth quarter;
7. CNBC: Nvidia and Amazon may participate in this round of OpenAI financing;
8. The Federal Reserve raises its assessment of U.S. economic activity, stating it is expanding at a "robust" pace.