Summary
BurgerSwap is a decentralized exchange (DEX) and automated market maker (AMM) protocol launched in September 2020 on Binance Smart Chain (BSC), built around the native BURGER governance token. On May 28, 2021, the protocol suffered a flash loan and reentrancy exploit that drained approximately $7.2 million in user funds across 14 transactions. Uniswap founder Hayden Adams publicly noted that a critical line of code enforcing the constant-product formula had been deliberately removed from BurgerSwap's fork of Uniswap v2, raising allegations of an intentional vulnerability or insider involvement by the anonymous development team.
Connected Entities
1 entitiesTimeline(9 events)
2020-09-01
BurgerSwap launches on Binance Smart Chain with the BURGER governance token.
2020-09-01
Beosin audits the first version of BurgerSwap smart contracts. Team relies primarily on internal audits and offers 1,000 BNB bounty for external review.
2021-05-28
Flash loan and reentrancy exploit drains approximately $7.2 million from BurgerSwap across 14 transactions on BSC. BURGER token price drops ~27%.
2021-05-28
Uniswap founder Hayden Adams publicly states BurgerSwap removed the only code line enforcing x*y=k from its Uniswap v2 fork, implying the vulnerability may have been intentional.
2021-05-28
BurgerSwap suspends protocol services and issues statement promising to cover user losses.
2021-05-29
SlowMist and PeckShield publish technical post-mortems confirming reentrancy vulnerability and missing constant-product formula enforcement.
2021-06-01
BurgerSwap publishes Go Forward Plan detailing cBURGER compensation token airdrop over 90-day linear distribution for affected liquidity providers.
2022-01-01
BurgerCities metaverse platform launches in alpha, marking effective rebranding from BurgerSwap.
2022-08-01
Maximum BURGER token supply tripled from 21 million to 63 million via governance decision, described as controversial by community members.
Decision Log
- hash: Eegks9dhD4KmrjRLpxHvMY2Fey9CdK6kDMZUMjnQqc1E
This investigation is cryptographically anchored to the Solana blockchain and source URLs are archived via the Internet Archive.
model: claude-sonnet-4-6
generated: 5/4/2026, 2:54:56 AM
last updated: 5/28/2026, 6:57:55 PM
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