How does it work, exactly? We just call this on-chain to get the latest price... but would our contract have to transfer some LINK to it, or what?
Which oracles are available, and what are their prices to call on-chain? All I am trying to do is find out onchain the "current" ETH-USD exchange rate, like a median across many exchanges or whatever. It doesn't have to be super exact, just not way off. What should I use for this?