Monitoring

MonoX

HIGHEthereum, Polygon·Swap Logic Flaw·#94 all-time
$31.4M stolenTuesday, November 30, 2021 · 1790 days ago

Corpus updated 2026-10-25

What happened

  • MonoX, a defi protocol, lost $31.4M on November 30, 2021.

  • The 20th largest of the 127 incidents recorded in 2021: 1.1% of the $2.87B lost to hacks that year.

  • Swap Logic Flaw is behind 37 recorded incidents totalling $52.5M; this is the largest of them.

Cite this record

Monitoring Room, "MonoX hack — $31.4M stolen", incident record, data: DefiLlama hacks dataset, as of 2026-10-25 08:00 UTC. https://monitoringroom.com/situation/crypto-hack/monox

Nearby in the record

Visor Finance
11/28/2021$976K
Badger DAO
12/2/2021$120.0M
Lever
11/27/2021$652K
Polygon
12/3/2021$2.0M
Snowdog
11/25/2021$18.1M
Bitmart
12/4/2021$196.0M
← All incidents

Source: DefiLlama · 1317 recorded incidents · data as of 2026-10-25 08:00 UTC