Pausable

What is Pausable?

Pausable is a smart contract security pattern that lets an authorized admin temporarily freeze specific functions during an emergency halting ongoing exploits or bugs to protect user funds.

How does Pausable work?

1. A paused boolean state variable is added to the contract.
2. Critical functions (withdraw, transfer) use a modifier that reverts if paused is true.
3. An authorized address (multisig or DAO) can call pause() and unpause().
4. During a pause, all protected functions revert automatically.

Why does Pausable matter?

It provides a critical defense against zero-day vulnerabilities missed in audits. While it introduces some centralization, most users accept this tradeoff to prevent catastrophic losses.

Key features of Pausable

• Immediate halt of sensitive functions
• Authorized admin required to trigger
• Transparent pause status visible to all
• Standard pattern from OpenZeppelin

Examples of Pausable

Tether (USDT) uses pausable to freeze tokens linked to criminal activity. A DeFi protocol detecting a bug in its rewards logic might pause for 24 hours while deploying a fix.