Monitoring

NowSwap

MEDIUMEthereum·Arithmetic Error·#606 all-time
$1.1M stolenWednesday, September 15, 2021 · 1866 days ago

Corpus updated 2026-10-25

What happened

  • NowSwap, a defi protocol, lost $1.1M on September 15, 2021.

  • The 87th largest of the 127 incidents recorded in 2021: under 1% of the $2.87B lost to hacks that year.

  • Arithmetic Error is behind 35 recorded incidents totalling $561.0M; this is the 15th largest of them.

Cite this record

Monitoring Room, "NowSwap hack — $1.1M stolen", incident record, data: DefiLlama hacks dataset, as of 2026-10-25 08:00 UTC. https://monitoringroom.com/situation/crypto-hack/nowswap

Nearby in the record

Zabu Finance
9/12/2021$3.2M
JayPegs Automart
9/17/2021$3.1M
DAO Maker Vesting
9/4/2021$4.0M
Vee Finance
9/21/2021$34.0M
Siren
9/3/2021$3.5M
Compound V2
9/29/2021$147.0M
← All incidents

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