AurusMEV is "maximal extractable value": profit that bots make by controlling the order transactions execute in. On Solana the version that matters to you is the sandwich. If you trade volatile tokens it has almost certainly cost you money you never saw leave.
How a sandwich works
A bot sees your buy coming. It buys just before you, pushing the price up. Your swap fills at that worse price. It sells right after you and keeps the difference. Your fill lands at the bad end of your slippage tolerance, and the bot's profit is more or less the slippage you allowed. The wider you set it, the bigger the free option you handed over.
Why Solana's a bit different
No public mempool like Ethereum's, so classic front-running is harder. Not impossible. A transaction sent to a public RPC can still be seen before it lands, and a small share of validators are statistically linked to sandwiching. Bots position around order flow through that, and sandwiching is routine on liquid memecoin pairs where tolerances are wide and volume is frantic.
What shrinks the window
- Keep slippage as tight as the token allows. The tolerance is the bot's max profit. Don't leave 20% on when 5% fills.
- Don't broadcast publicly. A swap that goes straight to staked validator connections instead of a public RPC is much harder to see in flight.
- Avoid the validators that do it. The leaders linked to sandwiching are a known, small set.
- Split big orders. A large swap into a thin pool is the best sandwich there is.
What Aurus actually does about it
Three things, all automatic. Swaps never touch a public RPC: they go straight to staked connections, and that's enforced from the signed transaction itself, not a setting. The validators statistically linked to sandwiching are filtered out of where your transaction is sent. Larger trades switch to a private auction lane instead. Slippage in auto mode is set from the token's current volatility and the number you see is the number enforced on-chain, so the free option stays small.
None of that makes a trade sandwich-proof, and we won't tell you it does. It makes the window small enough that most bots move on to easier targets. And at 0.001 SOL, at least one party in your trade isn't taking a percentage of it.
