As we know, Ethereum accounts need ETH to pay for sending transactions. However, this is not the only system where we need funds for operating: many decentralized systems on Ethereum depend on protocol-specific ERC20s to operate. This creates a need to monitor the balances of our contracts on different assets, and alert or react if they run dangerously low. PoolTogether is a decentralized protocol where prize games are pools of funds whose accrued interest is distributed as prizes, and is a long-standing Defender user. In this webinar, we’ll learn from their engineers how they use Sentinels for monitoring token balances on their system. We will cover: - How PoolTogether uses OpenZeppelin Defender, by building a Sentinel for detecting low funds on an ERC20 - Setting up a Defender Sentinel for monitoring a contract - Using an Autotask for defining custom conditions for matching transactions - Alerting via multiple channels and throttling alerts