Hack history / 2023 / Hack or exploit
Onyx Protocol
Hack or exploit on Nov 1, 2023 · Donation Attack
SOURCES AGREE ON DATE AND LOSS · 5 SOURCES
Lost
$2.1M
dollars at the time
Returned
none listed
as the sources state it
Rank
#672
among thefts by dollars lost
What happened
On November 1, 2023, Onyx Protocol (Compound V2 fork) was exploited for $2.1M. An attacker used a 4,000 ETH flashloan, swapped to PEPE, and donated to inflate the new oPEPE market's exchange rate, exploiting rounding errors in redemption logic.
Details
- Date
- Nov 1, 2023
- Kind
- Hack or exploit
- Method
- Donation Attack
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
Related incidents
Onyx V2 2024 · Hack or exploit · $3.8M
Euler V1 2023 · Hack or exploit · $197M
Hundred Finance 2023 · Hack or exploit · $7.2M
CFC 2023 · Hack or exploit · $16K
Euler V1 2023 · Hack or exploit · $197M
Hundred Finance 2023 · Hack or exploit · $7.2M
CFC 2023 · Hack or exploit · $16K
Cite this page
SwanBluechip, "Onyx Protocol hack, Nov 1, 2023: $2.1M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht5d7cb3d58d/ (data as of 2026-11-01).