Most people only complain about high gas.
Very few understand what’s actually happening behind the scenes.
It’s called "MEV" Maximal Extractable Value.
Here’s the simple version:
Every pending transaction sits in the mempool (public waiting room).
Bots are watching it 24/7.
When they see a profitable opportunity, they:
- Frontrun you
- Backrun you
- Or sandwich you
Sandwich Attack (most common):
1. You try to buy a token
2. Bot sees your big buy
3. Bot buys first (price goes up)
4. Your buy executes at worse price
5. Bot sells immediately after you
You paid more. Bot made risk-free profit. Your gas also went higher because of the competition.
Why it happens so much:
- Public mempool
- Transparent blockchain
- High volatility = more opportunities
- Sophisticated searchers + builders
How pros reduce MEV damage:
- Use private RPCs / protected transactions (Flashbots Protect, MEV Blocker, etc.)
- Trade on chains/L2s with less toxic MEV
- Avoid large swaps on low-liquidity pairs
- Use limit orders or RFQ systems when possible
- Split big orders
Key mindset:
Gas is the visible cost.
MEV is the invisible tax most retail pays without realizing.
Do you use any MEV protection, or still sending normal transactions?
Very few understand what’s actually happening behind the scenes.
It’s called "MEV" Maximal Extractable Value.
Here’s the simple version:
Every pending transaction sits in the mempool (public waiting room).
Bots are watching it 24/7.
When they see a profitable opportunity, they:
- Frontrun you
- Backrun you
- Or sandwich you
Sandwich Attack (most common):
1. You try to buy a token
2. Bot sees your big buy
3. Bot buys first (price goes up)
4. Your buy executes at worse price
5. Bot sells immediately after you
You paid more. Bot made risk-free profit. Your gas also went higher because of the competition.
Why it happens so much:
- Public mempool
- Transparent blockchain
- High volatility = more opportunities
- Sophisticated searchers + builders
How pros reduce MEV damage:
- Use private RPCs / protected transactions (Flashbots Protect, MEV Blocker, etc.)
- Trade on chains/L2s with less toxic MEV
- Avoid large swaps on low-liquidity pairs
- Use limit orders or RFQ systems when possible
- Split big orders
Key mindset:
Gas is the visible cost.
MEV is the invisible tax most retail pays without realizing.
Do you use any MEV protection, or still sending normal transactions?