**[Aptos' New On-Chain Trading Engine Decibel Launches Testnet, Unlocks Multiple Key Features]** BlockBeats news, November 20, the full-chain trading engine Decibel, built on Aptos, has officially launched its testnet. This protocol is jointly developed by Decibel Foundation and Aptos Labs, leveraging Aptos' high-performance infrastructure to provide a new execution and risk control framework for programmable and composable on-chain trading scenarios. The testnet now supports multiple core capabilities, including: sub-second transaction execution, a full-chain risk engine co-developed with Gauntlet, programmable order flow, encrypted memory pools, gas-free cross-chain deposits, batch orders, sub-accounts, and real-time price data and risk monitoring powered by Chainlink. Additionally, the Decibel testnet has opened its backend trading API with developer code, enabling developers to build programmable trading applications and earn transaction fee shares through developer code. Users can now participate in testing, experience related features, and submit feedback and suggestions.