This standard outlines a smart contract interface for a Circuit Breaker that triggers a temporary halt on protocol-wide token outflows when a threshold is exceeded for a predefined metric. This circuit breaker does not assume the structure of the underlying protocol, and mainly serves as a pass-through vehicle for token outflows. In order to maintain correct internal accounting for integrated protocols, and to provide maximum flexibility for developers, developers can specify if the circuit breaker contract should delay settlement and temporarily custody outflows during the cooldown period, or revert on attempted outflows.