The Aptos-incubated exchange now lets users encrypt order details before they hit the chain, aiming to blunt frontrunning and sandwich attacks
Decibel Trade has turned on Aptos ’ Encrypted Mempool. Traders on the onchain exchange can now hide the details of their orders while those transactions are still pending.
Think of a mempool as a public waiting room. Transactions sit there before validators bundle them into a block, and anyone watching can see who is in line and what they plan to do.
That visibility is the problem. Bots scan the waiting room, spot a large buy, and slip their own trades in before and after it. These tactics are called frontrunning and sandwich attacks, and the trader on the receiving end pays for them through worse prices.
The feature went live on Decibel Trade on October 21, 2026. It lets users encrypt their order payloads on their own device, client-side, before the order ever travels to the blockchain.
Not everything is hidden. The sender address and gas fee stay visible. What disappears from view is the substance of the trade: the function being called and the inputs fed into it.
Validators cannot read those specifics until the trade is finalized.
The capability became possible after Aptos activated governance proposal AIP-144, which was approved around October 12, 2026.
AIP-144 introduced batch threshold encryption to the network. Decryption keys are split across the validator set, so no single party can unlock pending orders early. The design requires no additional trust assumptions beyond the validators Aptos already relies on.
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Many existing anti-MEV setups lean on a trusted third party, such as a private relay, to keep orders hidden. Aptos instead builds the protection into its consensus layer.
The system requires no extra hardware or outside trust mechanisms for encryption and decryption, and it keeps onchain verifiability intact.
Encryption usually comes with a speed penalty. Tests indicate this one adds roughly 20–27 ms of latency, about 14% overhead on transaction times. In tests, the system also handled over 1,000 transactions per second with low overhead.
Decibel Trade is an onchain perpetuals and spot exchange incubated by Aptos Labs. It launched on mainnet in February 2026.
Since then it has processed over $8.2 billion in cumulative trading volume as of mid-October 2026. About $1.3 billion of that came in the previous 30 days alone.
The exchange runs on smart contracts written in Move, Aptos’ programming language. That setup lets it operate as a fully onchain central limit order book. Its markets span crypto and commodities.
For active traders, the immediate pitch is protection. Hiding order details until finalization could cut the losses that come from being sandwiched, especially on larger orders that bots love to target.
A 14% overhead is modest on paper. Whether it stays modest during volatile market spikes, when everyone is racing to get orders in at once, is the real test to watch.
The sender address and gas fee remain public, so sophisticated observers may still try to infer intent from patterns. And any new cryptographic system carries implementation risk until it has been battle-tested across many market conditions.
Key metrics to track from here include Decibel’s monthly volume relative to its recent $1.3 billion run rate, how latency behaves under heavier load, and whether other Aptos-based apps adopt the Encrypted Mempool.