Hack history / 2021 / Hack or exploit
MonoX
Hack or exploit on Nov 30, 2021 · Swap Logic Flaw
ATTACK TX CONFIRMED ON CHAININ REVIEWSOURCES AGREE ON DATE AND LOSS · 5 SOURCES
Lost
$31M
dollars at the time
Returned
none listed
as the sources state it
Rank
#151
among thefts by dollars lost
What happened
On November 30, 2021 MonoX was hacked for $31.4 million across Ethereum and Polygon when an attacker exploited a swap function that allowed same-asset swaps, using rapid swaps to manipulate the __updateTokenInfo function and artificially inflate MONO token price through a feedback loop, draining $18.2M WETH and $10.5M MATIC.
In review: possible duplicate within one source.
Details
- Date
- Nov 30, 2021
- Kind
- Hack or exploit
- Method
- Swap Logic Flaw
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum, Polygon, Bitcoin
- Audit (rekt.news)
- Halborn, Peckshield
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Cite this page
SwanBluechip, "MonoX hack, Nov 30, 2021: $31M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht158dcef677/ (data as of 2026-10-31).