The Baltimore Orioles secured Outright Assignment Waivers on RHP Pedro Araujo (who was Designated for Assignment by the Orioles on Wednesday) and then he was re-claimed by the Cubs for $50,000 (half the Rule 5 Draft price) and was outrighted back to AAA Iowa (the minor league club from which he was selected by Baltimore in the Major League Phase of the December 2017 Rule 5 Draft).
Then the Cubs traded Araujo back to the Orioles for 2018-19 International Signing Bonus Pool space.
So the Orioles get $50,000 and they get to keep Araujo (but don't need to keep him on their MLB 40-man roster -- he was assigned to AAA Norfolk), and the Cubs get to spend more ISBP money (if they so choose).