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They had this last year, https://www.odesk.com/community/node/31800 I just checked and the minimum bid I could enter (for programming work) is $4/hr, but not sure if other categories let you go lower. I think $4 is a very reasonable minimum. It would also help to improve oDesk's profit margin and remove some of the 'bottom feeder' type of jobs from here. Maybe a small client joining fee would also help.