Hack history / 2025 / Hack or exploit

402bridge

Hack or exploit on Oct 27, 2025 · Key Stored Publicly

SOURCES AGREE ON DATE AND LOSS · 2 SOURCES

Lost

$18K

dollars at the time

Returned

none listed

as the sources state it

Rank

#2,160

among thefts by dollars lost

What happened

On October 27, 2025, 402bridge on Base was compromised just days after mainnet launch, affecting over 200 users and losing 17,693 USDC. Attackers accessed private keys stored on servers with excessive authorization permissions in the x402 mechanism.

Details

Date: Oct 27, 2025
Kind: Hack or exploit
Method: Key Stored Publicly
How in: Keys, accounts and infrastructure
Target: DeFi protocol
Chains: Base

Reported by

DefiLlama ↗
SlowMist Hacked ↗

Related incidents

DogWifTools 2025 · Hack or exploit · $10M

Cite this page

SwanBluechip, "402bridge hack, Oct 27, 2025: $18K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht29749706b7/ (data as of 2026-10-31).

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