As of 2022, There is no startup fee. As a Network partner, the only cost is the investment made to receive stations and the subsequent monthly station fee of €5 per station.
While Market Operators do not have a startup cost as such they have a fixed fee as part of their deal, combined with a larger revenue share kept. The Market Operator can choose to pay their yearly fixed free upfront or monthly. This fixed fee can be used as credits for station orders at a later stage if they meet the credit milestones.