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Butter Bridge V3.1

Butter Bridge V3.1 provided the MAPO cross-chain service between legacy ERC-20 MAPO and MAP Protocol mainnet MAPO. On May 20, 2026, the OmniServiceProxy path was exploited to mint unauthorized MAPO on Ethereum and BNB Chain. MAP Protocol states that mainnet consensus, native MAPO, light-client verification, Oracle multisig, and project-team keys were unaffected; the affected service was suspended and remediation followed.

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Bridge facts

Canonical name
Butter Bridge V3.1
Type
Asset Bridge
Status
Limited
Confidence
High
Primary chains
Ethereum, BNB Chain, Unknown
Primary assets
Unknown
Operator
Butter Network / MAP Protocol ecosystem
Ecosystem
MAP Protocol
Launch date
Unknown
End date
Unknown
Terminal reason
Not applicable / unknown
Last reviewed
2026-09-01
Last verified
2026-09-01

Incident cases

  • Butter Bridge V3.1 2026 unauthorized MAPO mint exploit2026-05-20

    A flaw in Butter Bridge V3.1’s OmniServiceProxy cross-chain retry path was exploited, resulting in unauthorized MAPO minting on Ethereum and BNB Chain. MAP Protocol states that the flaw was isolated to the affected Butter Bridge path and did not compromise MAP mainnet consensus, native MAPO, light-client verification, Oracle multisig, or project-team keys.

    Exploitabout $180,000 extracted liquidityUnresolved

Evidence records

Official URL status

Official URL recorded as live_verified: https://medium.com/mapprotocol/map-protocol-may-updates-5003b0fc5d8f
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