Polymarket

What happened

• Polymarket, a defi protocol, lost $500K on November 11, 2025.

• The 87th largest of the 148 incidents recorded in 2025: under 1% of the $2.72B lost to hacks that year.

• One other incident was recorded the same day: Impermax V3 ($380K).

• The first of 2 recorded incidents at Polymarket; the next followed in May 2026, $700K.

• Phishing is behind 29 recorded incidents totalling $1.03B; this is the 20th largest of them.

Cite this record

Monitoring Room, "Polymarket hack (2025) — $500K stolen", incident record, data: DefiLlama hacks dataset, as of 2026-10-25 08:00 UTC. https://monitoringroom.com/situation/crypto-hack/polymarket

Other recorded incidents at Polymarket

DefiLlama records 2 separate incidents under this name.

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