According to the source, implementing circuit breakers on-chain is complex because highly composable DeFi protocols can propagate pauses or failures across lending, DEX, and collateral loops, a systemic risk highlighted by the Bank for International Settlements in its analysis of DeFi interlinkages. Existing controls like Aave’s Emergency Admin freeze and pause functions and Compound’s Pause Guardian can disable specific actions but cannot halt cross-protocol liquidations or price formation, as documented by the Aave documentation and Compound documentation. MakerDAO’s system-wide Emergency Shutdown can stop operations but historically created settlement and liquidity challenges during March 2020’s Black Thursday, according to MakerDAO documentation and Maker governance postmortems. Oracle update thresholds and heartbeats, together with MEV-driven transaction ordering, make coordinated halts and fair resets difficult during fast markets, as described by Chainlink documentation and Flashbots research. Risk teams advocate dynamic parameter throttling over blanket halts to reduce liquidation cascades, which traders should monitor in governance proposals and risk dashboards, as noted by Gauntlet research.