By SanctionsAI team · Updated 2026-08-09

EtherDelta OFAC case study (2018)

The 2018 EtherDelta case was one of the earliest OFAC enforcement actions related to a decentralized exchange (DEX). It established that sanctions compliance obligations extend to DEX operators.

Background

EtherDelta was a decentralized exchange built on Ethereum that allowed trustless trading of ERC-20 tokens. The platform processed transactions for users in comprehensively sanctioned jurisdictions without screening.

What happened

The EtherDelta case involved processing transactions for users who appeared to be located in sanctioned jurisdictions. The platform did not implement sanctions screening because, as a DEX, it did not hold custody of user funds.

Significance for DeFi

This case signaled that OFAC does not distinguish between centralized and decentralized platforms for sanctions purposes. Even platforms that do not custody funds must comply with sanctions if they facilitate transactions for US persons or involve US-person touchpoints.

IssueOFAC position
DEX exemption?No. Facilitation of transactions for sanctioned parties is prohibited regardless of platform architecture
Custody requirement?Not required for sanctions liability
Front-end screeningRequired even if back-end is a smart contract
For DeFi protocols: Implement front-end wallet screening using the SanctionsAI API. While smart contracts cannot be modified, front-ends can block designated addresses.

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Frequently Asked Questions

Was EtherDelta sanctioned by OFAC?
The 2018 case was one of the earliest enforcement signals that OFAC considers DEX operators subject to sanctions compliance, even without custody of funds.
Does OFAC apply to decentralized exchanges?
Yes. OFAC does not distinguish between centralized and decentralized platforms. Facilitation of transactions for sanctioned parties is prohibited regardless of architecture.
Can DEX smart contracts be sanctioned?
The Tornado Cash designation (2022) demonstrated that OFAC can designate smart contract addresses. The Fifth Circuit's 2024 ruling created uncertainty for immutable contracts.
What should DEX operators do?
Implement front-end wallet screening to block designated addresses. While bypassable, it demonstrates good-faith compliance effort.

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