Before tracking the money, let's get the basics straight. This time, we're talking about oracles.
Smart contracts can't directly access off-chain data, such as asset prices or weather, so oracles are needed to bring that data on-chain.
When choosing a DeFi protocol, check what kind of price feed it uses. The more concentrated the data sources, the greater the risk.
$LINK is the token of the decentralized oracle Chainlink. Current price: 10.392.