The Portal is a centralized bridge operated by Whitechain. It moves a fixed set of assets, USDC, USDT, WBT, and ETH, between Ethereum, Tron, and Whitechain in minutes, and it is the only route that connects Tron to Whitechain. The bridge liquidity sits in Portal contracts that Whitechain administers, and a Whitechain-operated relayer signs each transfer, so you trade self-custody for speed.

This is the opposite tradeoff from the OP Stack canonical bridge, which is trust-minimized but takes a minimum of 7 days to withdraw to Ethereum on mainnet. 

You can use the Portal when you need a fast transfer, a Tron route, or a token the canonical bridge does not support. 

The Portal connects Ethereum and Tron to Whitechain in both directions. There is no direct Ethereum to Tron route; to move between them, bridge through Whitechain in two steps.

Tokens are a fixed list configured per route. A token deposited to Whitechain arrives as its bridged representation: USDC becomes USDC.e, and USDT becomes USDT.e. WBT keeps its symbol and is the native gas token on Whitechain. ETH also keeps its symbol, and it arrives as a pegged ERC-20 minted against WETH locked on Ethereum.

The Portal is deployed on Testnet today (Ethereum Sepolia, Tron Nile, and Whitechain Sepolia), and its user-facing app is still in development; its Mainnet routes and addresses are published at Mainnet launch.

How a transfer works

1. Submit the transfer on the source network and sign one transaction. You can set a recipient address different from your own.
2. Wait for the source network to confirm. Confirmation takes about 12 minutes on Ethereum and about 1 minute on Whitechain.
3. The relayer checks that the destination network holds enough liquidity for the token. If liquidity is short, the transfer is rejected, and you can retry later.
4. The relayer releases the funds on the destination network. A Whitechain-to-Ethereum transfer is executed by the Portal, which pays the Ethereum gas for you.

Transaction statuses

• Submitting: The transaction is being sent on the source network, and your wallet is waiting for your confirmation;
• Confirming: The source network is confirming the transaction;
• Sending: The Portal has seen the deposit and is releasing the funds on the destination network;
• Completed: The funds have been sent to the destination network.

Fees and limits

The Portal charges no bridging fee today. You pay the source-network gas for your own transaction.

For a Whitechain to Ethereum transfer, the Portal pays the Ethereum gas and recovers it by charging you the equivalent in WBT. It reads the current Ethereum gas price, prices a typical token transfer, and converts that cost to WBT using WhiteBIT market rates.

Daily limits are per token and apply to the current testnet deployment. Values may change, and mainnet limits are set at launch: