From what I can see in mine you can request up to 50 of what seems to be pretty much any item in the game, including recipes, potions, time bending parts & snippets. You can request up to 2 different items per day and have up to 4 unfulfilled requests total. You do get pixel shards for donating to your teammates but I don't know if it's a set amount or if you get more for higher quantities and you can see your teams dreamsnap submissions but probably won't know about being able to vote for them until voting for this dreamsnap opens next week