<p>This study analyses the impact of zero-fee trading policies, both their initiation and cessation, on price clustering within cryptocurrency markets, specifically targeting the BTC/USDT trading pair across prominent exchanges like Binance, Bitfinex, Coinbase Pro, and KuCoin. The study identifies significant alterations in price clustering tendencies by analysing trading behaviour during periods with and without trading fees. The results demonstrate that the elimination of fees diminishes the propensity for price clustering at particular price levels, implying that the removal of fees fosters more accurate price-setting practices. The reinstatement of fees, in contrast, increases the predicted probability of clustering, indicating a resurgence of more concentrated pricing structures. This research highlights the impact of trading costs on cryptocurrency market dynamics, enhancing comprehension of trader behaviour in Bitcoin markets.</p>