Key facts: CRYPTO:BTCUSD $64.5k; El Salvador ends BTC; Polymarket drop

BTCUSD fell ~0.2% to ~$64,496. Nansen on-chain and derivatives data show buyers haven’t re-entered; downside risk to about $52,000 remains. Fed rate decision this week may affect moves.El Salvador stopped Bitcoin as legal tender in Feb 2025 under an IMF loan, kept state BTC purchases and tracking, and expanded gold reserves — key moves for BTCUSD spot CFD traders.On Polymarket, a July 28 BTCUSD (Spot CFD) breakout at $64,000 saw 'Yes' probability drop from 78.5% to 47% in an hour — a 31.5-point fall tied to breaking news.