Hack history / 2026 / Hack or exploit
Polymarket
Hack or exploit on May 22, 2026 · Private Key Compromised
SOURCES AGREE ON DATE AND LOSS · 3 SOURCES
Lost
$700K
sources: $573K to $700K
Returned
none listed
as the sources state it
Rank
#1,040
among thefts by dollars lost
What happened
Polymarket's internal operations wallet was drained on May 22, 2026 of ~$700K in POL tokens. An attacker obtained a 6-year-old private key and withdrew funds in 5,000 POL batches, but Polymarket confirmed user funds were unaffected.
Details
- Date
- May 22, 2026
- Kind
- Hack or exploit
- Method
- Private Key Compromised
- How in
- Keys, accounts and infrastructure
- Target
- DeFi protocol
- Chains
- Polygon
Related incidents
Polymarket International 2026 · Hack or exploit · $2.7M
Polymarket International 2026 · Hack or exploit · $3M
Polymarket 2025 · Hack or exploit · $500K
Polymarket suffers governance attack as whale manipulates Ukraine bet resolution; refuses refunds 2025 · Fraud · $7M
Step Finance 2026 · Hack or exploit · $40M
Polymarket International 2026 · Hack or exploit · $3M
Polymarket 2025 · Hack or exploit · $500K
Polymarket suffers governance attack as whale manipulates Ukraine bet resolution; refuses refunds 2025 · Fraud · $7M
Step Finance 2026 · Hack or exploit · $40M
Cite this page
SwanBluechip, "Polymarket hack, May 22, 2026: $700K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht670e70ed72/ (data as of 2026-10-31).