When was Perpetual Protocol launched?

Can you tell me when exactly was Perpetual Protocol launched? I'm quite interested in knowing the date of its inception as I've been hearing a lot about this decentralized perpetual swaps protocol in the cryptocurrency space. I understand it's a protocol designed to facilitate perpetual swaps trading on decentralized exchanges, and I'm curious to know when it was first introduced to the market. Any specific details or insights you can provide would be greatly appreciated.