You are the taker: you want today's dollar value of …, whatever ZEC does next. A house maker agent takes the other side of that price risk for a small premium. After your click nobody presses anything: the agents quote, offer, sign, fund and settle on their own, and two oracles supply the price. Every transaction is real, on Zcash testnet, and a trade usually takes two to four minutes.
One trade runs at a time; everyone watching this page sees the same one.
You joined a trade that was already running: watch it settle, then request your own.
Owed today's dollar value of the ZEC at the price minute; pays the maker a premium for it.
Request for quote (RFQ): lists signed requests and the quotes on them. It holds no funds and no keys, and never sees the contract.
A house agent. It quotes a … premium on every request and accepts the offers that match its quotes, with nobody in the loop.