Transferring Funds Across Spaces

ConfluxHub

The easiest way to transfer assets between Core Space and eSpace is to use ConfluxHub. We recommend that you set up two wallets: Fluent for Core Space and MetaMask for eSpace.

Follow these steps to make a cross-space transfer:

• Start by clicking on Connect Wallet to connect your Fluent and MetaMask wallets to ConfluxHub.
• To: Conflux eSpace at the top shows that you are making a transfer from Core Space to eSpace. If you would like to make a transfer in the other direction, click on the arrow next to this text.
• In the Conflux eSpace Destination Address field, type in your eSpace address or click the MetaMask icon on the right to fill this field automatically.
• Next, select the token that you want to transfer and enter the transfer amount.
• If the button on the bottom says Approve, click on it to submit an ERC20 token approval first.
• Once the button on the bottom says Transfer, click on it to make the transfer.

Making a cross-space transfer from eSpace to Core Space follows a similar process but it has two main steps: First, transfer the token to the bridge on eSpace. Second, withdraw the token from the bridge on Core Space. Please follow the site’s instructions.

⚠️ When making a cross-space transfer, always double check your addresses to avoid accidental asset loss.

Cross-Space Transfers for Developers

Below we will discuss how to make cross-space transfers programmatically.

Internal Contract

CIP-90 introduced the concept of two spaces running on one blockchain, and defined a new internal contract to connect the two. This contract is available under the address cfx:aaejuaaaaaaaaaaaaaaaaaaaaaaaaaaaa2sn102vjv (hex: 0x0888000000000000000000000000000000000006) on Core Space.

interface CrossSpace {
    /* methods for cross-space CFX transfers */

    function transferEVM(bytes20 to) external payable returns (bytes memory output);

    function withdrawFromMapped(uint256 value) external;

    function mappedBalance(address addr) external view returns (uint256);

    /* methods for other cross-space operations */

    function callEVM(bytes20 to, bytes calldata data) external payable returns (bytes memory output);

    function staticCallEVM(bytes20 to, bytes calldata data) external view returns (bytes memory output);

    // ...
}