Tier 1 = major banks (JPMorgan, Citibank). Deepest liquidity. Direct market access.
Tier 2 = aggregators. Feed brokers like PU Prime. Competition keeps spreads tight.
8:30AM = thin liquidity. LPs pull quotes. That fakeout spike is institutional orders in thin market.
8:35AM = liquidity restored. Spreads tight. Clean fills. Your entry window exists for a reason.
Avoid low liquidity sessions — Asian, Friday PM, first 2 min after news. Wider spreads, bigger slippage.