Drivers of spread variation
Bid-ask spreads reflect the compensation market makers require for providing immediacy. Classic market microstructure research by Larry Harris University of Southern California and Joel Hasbrouck New York University Stern establishes that the main drivers are liquidity, volatility, order-book depth, and information asymmetry. In crypto markets these forces interact with venue fragmentation, token-specific supply dynamics, and differences between centralized order books and decentralised automated market makers, producing regime-dependent spreads. Nuance arises because crypto markets combine retail-heavy flows with professional arbitrageurs and on-chain public information.
Calm versus volatile regimes
In low-volatility, high-liquidity regimes spreads are typically narrow: deep limit order books on major centralized exchanges compress transaction costs, while active market makers and low adverse selection keep spreads tight. Under sudden volatility spikes spreads widen as inventory and adverse-selection risk increase, consistent with general findings from Harris and Hasbrouck. During stress events, cross-venue fragmentation can amplify widening because liquidity providers withdraw and latency-sensitive arbitrageurs cannot fully offset imbalances.
Centralized exchanges and AMMs
Centralized exchanges tend to show tighter spreads for top tokens because professional liquidity provision and tight quoting algorithms dominate. Decentralized exchanges using automated market makers implement pricing via liquidity pools; Hayden Adams Uniswap Labs describes how pool depth and the constant-product formula determine slippage and effectively a dynamic spread. When pool reserves are shallow or when large trades move the price, AMM effective spreads and transaction costs can exceed CEX spreads, especially for smaller tokens.
Structural and territorial consequences
Institutional analyses by the Bank for International Settlements Bank for International Settlements note uneven liquidity across venues and jurisdictions, meaning traders in emerging markets can face persistently higher spreads for on-ramps and stablecoins. Wider spreads reduce market access, increase execution costs for retail users, and can exacerbate price dislocations that harm confidence. Conversely, improved market-making, cross-venue connectivity, and incentives such as maker rebates can compress spreads over time. The interaction of technology, regulation, and participant composition shapes how spreads evolve across market regimes.