This is a suite of contracts that can pull data from Tellor price feeds. There are contracts that can build a TWAP from a specific price feed as well as contracts that simply read the current result from a feed.
Contracts that require state updates can be connected to a separate contract that pays out rewards for updates in the form of GEB system coins.
Tellor docs: https://tellor.io/docs/
Query builder: https://queryidbuilder.herokuapp.com/spotprice
There's an ongoing bug bounty program covering contracts from this repo.