Polymarket

What happened

• Polymarket, a defi protocol, lost $700K on May 22, 2026.

• The 128th largest of the 309 incidents recorded in 2026 so far: under 1% of the $2.36B lost to hacks that year.

• This is the 2nd recorded incident at Polymarket; the previous one was in November 2025, $500K.

• Private Key Compromised is behind 69 recorded incidents totalling $1.25B; this is the 51st largest of them.

Cite this record

Monitoring Room, "Polymarket hack (2026) — $700K stolen", incident record, data: DefiLlama hacks dataset, as of 2026-10-25 08:00 UTC. https://monitoringroom.com/situation/crypto-hack/polymarket-2026

Other recorded incidents at Polymarket

DefiLlama records 2 separate incidents under this name.

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