To assess market liquidity by comparing trading depth across exchanges, analyze order books to evaluate the volume of buy and sell orders at various price levels. Deep liquidity shows tight bid-ask spreads and large order sizes, indicating a robust market where trades execute with minimal slippage. Start by collecting real-time data from exchanges like Binance, Coinbase, or Kraken, focusing on a specific asset pair (e.g., BTC/USD). Compare the depth charts: a steep drop-off in volume suggests shallow liquidity, while gradual changes reflect resilience. Cross-check with trading volume and historical trends to confirm consistency. Exchanges with higher depth typically signal true liquidity, reducing manipulation risks. Use this method to identify reliable markets for efficient trading.