Mangrove, a decentralized exchange (DEX), has launched on Polygon's testnet with a programmable order book. The Paris-based firm has raised around $10 million and is supported by major trading and market making players like Wintermute and Cumberland. The company plans to launch on mainnet at the beginning of next month. Mangrove's "advanced limit order" innovation allows traders to propose selling digital assets at a given price while depositing those assets as collateral on a lending platform and generating passive yield. This more flexible version of a limit order allows traders to have a savings account and sell at a certain exit price.