sienaVerified deployment reference
Permit2 on both chains: 0x000000000022d473030f116ddee9f6b43ac78ba3. Always check both network and spender before signing.
Initial fee wallet: 0x742584df7dca88f00ae32c7a9d680343d8b64f7a. A network may later use a different project wallet; check the recipient link in Fees & execution details for your quote. Fees go directly to that wallet in the output token. No new fee custody contract is used. Listed routers do not guarantee route availability.
| Network | Universal Router address |
|---|---|
| Base · 8453 | 0x6ff5693b99212da76ad316178a184ab56d299b43 |
| Arbitrum One · 42161 | 0xa51afafe0263b40edaef0df8781ea9aa03e381a3 |
Spending permissions
Siena prepares its supported direct-pool route. Universal Router itself is a general-purpose Uniswap contract. Permit2 router permissions expire after one hour; underlying token approvals remain until spent or revoked. Disconnecting Siena revokes neither permission.
User output is returned within the swap transaction. Siena does not ask you to hand over a private key or seed phrase.
Testing and its limits
Siena tests its integration using captured Universal Router and Permit2 runtime bytecode on a local EVM, including fees, minimum-output failures and permission reuse.
These checks are not an independent security audit, an insurance policy or a guarantee against loss. Wallet compromise, token behavior, smart contract defects, network events and market execution remain relevant risks.
Use official references
Verify transactions on BaseScan or Arbiscan using the chain shown in your wallet. Project announcements and support are available at x.com/0xSienaHQ.
Never send a seed phrase, private key or a payment to someone claiming they can unlock a Siena reward.