Synthetix USD (sUSD) Smart Contract Risk
Upgradeable Proxy Token
⚡ MEDIUM severityVulnerability
sUSD is an upgradeable proxy token. The implementation contract can be changed by the Synthetix team, potentially altering transfer behavior, adding fees, or changing the token interface.
Related: Proxy Storage Collision
Safe integration
Be aware that token behavior may change after deployment. Monitor proxy upgrades and implement circuit breakers for critical integrations.
Contract addresses
| Chain | Address |
|---|---|
| Ethereum | 0x57ab1ec28d129707052df4df418d58a2d46d5f51 |
Audit any contract that interacts with sUSD: SmartContract.us automatically detects sUSD integration risks →
Chain & standard security guides
What this contract permits today
Read live from Ethereum on 2026-10-14. This is a different question from the integration risk above: not how to call the token safely, but what the holders of its keys are able to do to the people holding it.
| Question | Answer |
|---|---|
| Can new tokens be created? | No |
| Can transfers be blocked? | No |
| Is there a trading tax? | No |
| Can the logic be replaced? | No |
| Can liquidity be withdrawn? | Yes |
The permissions above rest with 0xEb3107117FEAd7de89Cd14D463D340A2E6917769, itself a contract, which may be a multisig or a timelock. Whether that is acceptable depends on who holds it.