Bisq
Bisq is a safe, private and decentralized way to exchange bitcoin for national currencies and other digital assets. Bisq uses peer-to-peer networking and multi-signature escrow to facilitate trading without a third party. Bisq is non-custodial and incorporates a human arbitration system to resolve disputes.
Bisq is a free and open source crypto DEX that has an open api for trading without need for intermediaries.