Individual skill
contracts-mev-sandwich
MEV sandwich attacks — front-run + back-run a victim swap on Uniswap V2/V3, Curve, Balancer; mempool monitoring via Flashbots / private RPC, slippage tolerance exploitation, JIT liquidity sandwich, multi-block MEV.
packages/decepticon/decepticon/skills/standard/contracts/mev-sandwich/SKILL.md
Source commit df879550544d36b6b1e69062f05adae28537adf2
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 6,578
- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent Repository topic
- ai Repository topic
- cybersecurity Repository topic
- hacking Repository topic
- langchain Repository topic
- langgraph Repository topic
- llm Repository topic
- generative-ai Repository topic
- pentesting Repository topic
- pentest Repository topic
- defi,-mev,-front-running,-dex Declared skill tag
- engineering Derived category
Files and excerpt
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# MEV Sandwich Attack
You observe a victim's DEX swap in the mempool. Sandwich it: buy the same token before the victim (pushing price up), let the victim swap at a worse price, then sell after them.
## Detect a sandwichable swap
```python
# Stream pending transactions
from web3 import Web3
w3 = Web3(Web3.HTTPProvider("https://eth.merkle.io"))
# Or: subscribe to alchemy/blocknative streams
# Filter for Uniswap V2 swapExactTokensForTokens or V3 exactInputSingle
# Look at the swap amount + slippage tolerance (deadline + minAmountOut)