Overview
How bridging works between Ethereum and Mandala, the two timing profiles, and where to actually do it.
Bridging means moving funds between Ethereum L1 and Mandala. There are two directions, with very different timing profiles, and Mandala uses the standard Arbitrum optimistic-rollup bridge model with no chain-specific quirks at the user-facing level.
Two directions, two timelines
| Direction | Timing | What happens |
|---|---|---|
| Ethereum → Mandala | Minutes | Funds lock in the L1 Bridge contract, the sequencer picks up the deposit, and the matching balance appears on Mandala. No challenge window. |
| Mandala → Ethereum | ~7 days | You initiate on L2. After the optimistic-rollup challenge window passes on L1, you (or anyone) can claim the funds on Ethereum. |
The 7-day window is not a Mandala parameter; it is the standard Arbitrum dispute period. For why it exists, see Trust & Security Model.
Use the Arbitrum Portal
The official Mandala bridge UI is hosted at the Arbitrum Portal:
portal.arbitrum.io/bridge (Mandala route)
The Portal handles both deposits and withdrawals, supports ETH plus arbitrary ERC-20s through the canonical token gateways, and routes claim transactions on L1 once a withdrawal's challenge window has passed.
The Mandala team does not host its own bridge UI. The Portal is the canonical interface.
What you can bridge
- ETH: lands on Mandala as ETH balance.
- KPG: lands on Mandala as native KPG, which is the gas token of the chain.
- ERC-20 tokens: routed through the standard or custom token gateway, depending on whether the project has registered a custom gateway. The Portal handles the routing automatically.
L1 contracts behind the bridge
The Portal is a UI in front of these L1 contracts:
| Contract | Address |
|---|---|
| Bridge | 0x65DB181838b53f32428ce106fA5355b7e4806b79 |
| Inbox (delayed) | 0x62DfD05c460C7E55DA85B39EaD3eBc6e0CcdD0d5 |
| Outbox | 0x004eF39261cee56409Dbd26040a33Eca8326490C |
Deposits go through the Inbox. Withdrawals are released by the Outbox after the challenge window passes. The Bridge holds the underlying funds.
Faster withdrawals
Third-party fast bridges (intent-based, liquidity-provider-backed) can give you instant withdrawals at the cost of paying a fee to a liquidity provider. They take the credit risk on themselves and front you the funds while the canonical 7-day withdrawal completes in the background.
These services are not part of Mandala's protocol. Use them if the timing trade-off is worth the fee.