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🤖 RoboSaver turns your Gnosis Pay card into an automated savings account!

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RoboSaver

RoboSaver turns your Gnosis Pay card into an automated savings account!

Unused EURe on your card gets deposited into a liquidity pool, where it collects yield and swapping fees. But as soon as your card's balance gets below a certain threshold, the RoboSaver will withdraw some EURe from the pool for you and top up your card. Thus creating the perfect balance between having EURe ready for spending and putting EURe to work!

1. Technical Details

Only a single smart contract is needed; RoboSaverVirtualModule. The module is "virtual", since it doesn't get installed on the Gnosis Pay Safe directly, but on the Delay module instead. This way all of its transactions still respect the necessary delay needed to eventually settle with Visa.

Currently the contract is automated by having a keeper call checkUpkeep to see if any action is needed, and, if needed, then via performUpkeep internally call _adjustPool to perform that necessary action.

1.1 External Methods

  • checkUpkeep(): a view function that determines whether the balance of the card is in surplus or deficit; returns whether an adjustment to the pool is needed and the payload needed to do so
  • performUpkeep(bytes calldata _performData)): call the necessary internal method needed to rebalance the pool

2. Installation

2.1 Build

After cloning the repo, run forge build to initiate a compilation and fetch necessary dependencies.

Compilation of the contract at the end will raise some errors; this is because currently the delay-module requires a separate installation of dependencies. To fix this, run yarn install --cwd lib/delay-module (or yarn install with your current working directory being lib/delay-module).

Finally, copy .env.example to .env and populate it.

2.2 Test

$ forge test -vvvv

2.3 Local Deployment

$ make startAnvil
$ make deployAnvil

3. Debugging

3.1 checkUpkeep(bytes) raw values returned mapping (bytes -> string)

Bytes Readable String
0x5669727475616c206d6f64756c65206973206e6f7420656e61626c6564000000 Virtual module is not enabled
0x45787465726e616c207472616e73616374696f6e20696e2071756575652c207761697420666f7220697420746f20626520657865637574656400000000000000 External transaction in queue, wait for it to be executed
0x496e7465726e616c207472616e73616374696f6e20696e20636f6f6c646f776e2073746174757300000000000000000000000000000000000000000000000000 Internal transaction in cooldown status
0x4e6f207374616b6564204250542062616c616e6365206f6e20746865206361726400000000000000000000000000000000000000000000000000000000000000 No staked BPT balance on the card
0x4e6569746865722064656669636974206e6f7220737572706c75733b206e6f20616374696f6e206e656564656400000000000000000000000000000000000000 Neither deficit nor surplus; no action needed