Chainlink

Understand the mechanisms, then explore their implications.

A lending contract needs collateral prices, but its blockchain does not natively know every market price.

Data Feeds aggregate observations and expose results to applications, commonly through a proxy pointing to an aggregator.

Cross-Chain Interoperability Protocol supports messages and token transfers between supported networks.

Smart contracts may need verifiable randomness or an external trigger when a condition is met.

LINK participates in the economics of Chainlink services, including payments and certain staking arrangements.

Evaluate an oracle at the level of its particular feed and deployment.