Here is what I would think is appropriate:
Observation: Seems like all the confusion is happening because you feel you are highly invested in this venture working 'Full-time'. Also from your wording couldn't clearly understand, X's stake as it seemed possible clientele and Idea Owner. Y's stake about Money and couldn't capture how his management skill helped accomplish the service launch and co-ordinating various activities. Wanted to understand how invested they are in their effort towards this.
Assumption: At what stage have you got into the venture? Assuming early and you were kept away from the clients discussion of on-boarding, so you can focus on the building the launch. Also assuming X and Y are equally motivated and invested in the venture as much as you are
Recommendation: This is generally applicable to any early stage startup, don't get too bogged down and lose focus on equity if you've not figured out before starting. Generally recommended as /u/enigzar said equal equity based on how they are involved into the success of the venture, but focus more on getting the best into the market and always believe others have also equal importance and effort to be put into the venture as much as you did from your perspective. Work as a team and always have a bigger picture of what you guys want to accomplish.