The crypto market, including top altcoins XRP and XLM, is stable but under pressure ahead of the FOMC meeting.FOMC monetary policy decisions can influence risk assets, potentially leading to an altcoin rally.Analysts are anticipating the impact of FOMC decisions on XRP and XLM prices.XRP and XLM are currently at key support levels and may be affected by the FOMC's decision to raise or lower interest rates.