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3) Each approach has its own issues. Right now, frankly, something like 'median of CEX orderbooks' is probably the best oracle. But there are issues with it, which

@haydenzadams

points out: a) sometimes CEX APIs crap out b) this is only good assuming most liquidity is on CEXes

4) c) you have to trust the reporting agents a & b don't apply to DEXes, they get those for free! But (b) does, and right now it's an issue; most liquidity is not on DEXes. In addition, ETH-based DEXes are slow, which means their prices are stale.

5) Hedging on them can also have issues. If 50% of orders whiff because of race conditions and blockchain capacity issues, you can't trust that the current DEX marketdata is really tradable exactly. Also, for better or for worse, CEXes have more circuit breakers than DEXes.

6) This can be good (stops crazy prints!) or bad (stops real price movement!) You also have to worry about withdrawal blocked CEXes.

7) In the end it's tough and there are pros and cons. Right now I think 'median of CEXes' is about as good as you can get, though you prob want to add 'and bound within 5% of a 5-min EWMA' or something like that.

8) One issue, though: in the end, if the underlying asset isn't liquid enough, no oracles can save you. DAI just isn't very liquid. Not on CEXes, not on DEXes, not anywhere. And partially it could use more market makers. But partially it's way worse than that.

I think it would be fair to say that, over the course of crypto, three classes of coins have served as the backbone of the industry: BTC…

9) The underlying liquidity problem here is that DAI is a stablecoin that you can't create or redeem for $1. So it's not, in the end, all that stable when push comes to shove.

medium.com

A Little Unsteady

10) So whatever oracle you use for DAI, $100m of buying or selling pressure well blow it out.

11) TL;DR: a) LINK is pretty good as far as DeFi oracles go right now b) there are pros and cons to each, and maybe over time direct on-chain price feeds will get more competitive c) whatever you do, DAI isn't very liquid and can blow out