SpendSave
The savings layer for DeFi
The problem SpendSave solves
The problems we're solving include:
Inconsistent saving behavior: Most DeFi users focus on trading but neglect consistent savings, which is the foundation of wealth building.
High cognitive load: Currently, saving requires separate, deliberate actions after trading, creating friction that prevents good habits from forming.
Missed opportunities: Without automatic saving mechanisms, users often spend or trade all their available tokens rather than setting some aside for long-term growth.
Lack of structured saving tools: While DeFi offers complex trading and yield strategies, it lacks basic personal finance infrastructure like automated savings plans.
We realized that Uniswap V4's hook system provides the perfect opportunity to integrate savings directly into existing user activities. By automatically diverting a small percentage of each swap into savings, users can build wealth passively while continuing their normal trading behavior.
This approach eliminates the need for behavior change, which is typically the biggest barrier to developing good financial habits. Users simply trade as they normally would, while SpendSave works silently in the background to help them accumulate long-term savings.
Challenges I ran into
Building SpendSave presented several significant challenges:
1. Technical Integration with Uniswap V4
The biggest technical challenge was properly implementing Uniswap V4 hooks. This is cutting-edge technology that allows us to intercept swap transactions, but it required deep understanding of Uniswap's internal mechanics. Getting the beforeSwap and afterSwap hook callbacks right was particularly difficult, especially ensuring proper handling of swap deltas across different token types.
2. Complex Error Handling:
Since we're operating within Uniswap's transaction flow, we can't simply revert transactions when something goes wrong with our savings logic. We had to build sophisticated error handling that would allow swaps to proceed even if saving operations failed, while still providing meaningful feedback.
3. Modular Architecture Design:
Creating a clean separation of concerns across eight specialized modules while maintaining their ability to work together seamlessly was challenging. Each module needed clear interfaces and access controls while still being able to coordinate complex operations like DCA execution.
4. Balancing Automation with User Control
Finding the right balance between automatic operation and user control was difficult. Users need enough control to set their preferences, but too many options would create friction – the very thing we're trying to eliminate. We spent significant time designing intuitive strategies that work well with minimal configuration.
5. Testing Complex DeFi Interactions
Testing the full range of swap scenarios, token types, and strategy configurations presented unique challenges. We built comprehensive test infrastructure including scenario-based testing and gas profiling to ensure reliability across all use cases.
Tracks Applied (2)
Consumer
DeFi
Technologies used
Cheer Project
Cheering for a project means supporting a project you like with as little as 0.0025 ETH. Right now, you can Cheer using ETH on Arbitrum, Optimism and Base.