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XStream

The first cross-chain streaming protocol.

Built with Superfluid and Connext.

OriginPool.sol

The OriginPool is a registered "Super App", a smart contract that receives callbacks from the Superfluid Host contract on the creation of a stream from any address.

The creation, updating, or deletion of a stream triggers the appropriate callback. When this happens, OriginPool sends a message to the Connext contract to be sent to the DestinationPool.

The OriginPool also exposes a rebalance function that takes no arguments, it simply downgrades the Super Token to its underlying asset, then sends the full balance to the DestinationPool. Since the stream is one-way, there is no need to keep any tokens in the OriginPool. Notice that the underlying asset must be transferred, not the Super Token itself.

DestinationPool.sol

The DestinationPool is an EIP-4626 Standardized Token Vault where the asset is the Super Token, not the underlying asset. The totalFees function accounts for fees that have 'accrued' based on the most recent flow update and rebalance call.

When a flow message is received, the fee accrual rate is updated and a stream is created with a flow rate equal 99.9% of the sender's flowRate. The receiver of the current iteration is the same address that sent the stream.

When a rebalance message is received, the contract must receive a non-zero transfer of the underlying asset, since the call is permissioned from the OriginPool. Therefore, the contract upgrades the entire balance of the underlying asset to the Super Token. This also updates the feesPending appropriately.

Testnet Deployments

Origin Goerli: 0x4dda7f1a17721ec3a86b73141153ab7d1c7a2f9a Destination Kovan: 0x9c8c227188192ecebfcfb96e266bec1595227259

SuperTest Goerli: 0x9a66388541b5c32ca6caa245406fe67cedf663f8 SuperTest Kovan: 0x720e4f8508c44955417b1e781956f368585ba239