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Super Apps
Building Programmable Cashflows

What is a Super App?

A Super App is a contract that reacts on-chain to changes within super agreements that the contract is associated with. They may be used in conjunction with the Superfluid Constant Flow Agreement (CFA) to create truly programmable cashflows.
Super Apps allow us to build smart contracts that are fully integrated with Superfluid at the protocol level. If you've looked at our Tradeable Cashflow tutorial or our User Data tutorial, we are using a Super App in each of those sample applications.
The Tradeable Cashflow NFT
For example, the tradeable cashflow NFT contract receives a stream, and then uses special callbacks within the SuperApp to automatically open up a new stream from the NFT to the owner of the NFT. The contract 'listens' for a call to a Superfluid super agreement contract (the Constant Flow Agreement contract), and runs a single callback function in response to the following 3 actions:
  1. 1.
    A flow is opened with the Super App as the receiver
  2. 2.
    A flow is updated which has the Super App as the receiver
  3. 3.
    A flow is closed by the Super App's counter party (i.e. if either the sender of a flow into the Super app or the recipient of a flow from the Super App deleted the flow, a callback will be run). As of today, this is only relevant for the case of canceled flows.
When a stream is created into a Super App (this will make the Super App the receiver ), the beforeAgreementCreated and the afterAgreementCreated callback may be run. These callbacks can execute any arbitrary logic, as long as this logic fits within the rules of standard smart contract development and the rules of Super Apps (which are explained further later on in this section).
In the case of the tradeable cashflow contract, the logic we include inside of the afterAgreementCreated callback will open up a money stream from the app to the NFT's owner in an amount that is equal to the flowRate into the app.
Super Apps like the tradeable cashflow example keep their callback logic simple, while others get more advanced and leverage items like userData for additional functionality.
Some of the most interesting projects in our ecosystem, such as Ricochet Exchange, make heavy use of Super App callbacks.
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