SYMMIO is a decentralized derivatives protocol that introduces the concept of symmetric contracts, a new trading primitive that facilitates on-chain OTC derivatives trading. SYMMIO is built on an intent-centric architecture. When both parties submit collateral, the requester (Party A) and responder (Party B) are matched and the trade is executed, locking them into isolated, symmetric transactions. SYMMIO itself does not provide any transactions or facilitate any derivatives transactions. SYMMIO only provides a peer-to-peer bilateral matching infrastructure that third-party providers can use to build fully functional on-chain derivatives exchanges.