How DeFi Saver Lets Users Verify Outcomes Before Committing Capital

Key highlights:

• The problem: DeFi Saver aggregates multiple lending, borrowing, and trading protocols, enabling users to bundle multiple actions into a single transaction and manage their portfolios from a single interface. Given the complexity of decentralized finance and the scope of the platform, users need to understand what their actions will do before committing capital.
• The solution: DeFi Saver enabled simulation mode within their product using Tenderly, giving their users a playground for experimenting with different strategies, trying out new protocols, and learning how the platform works. Internally, the team uses the same simulation capabilities for validating protocol integrations before production and resolving user issues.
• Key results: Around a third of DeFi Saver users regularly enter simulation mode, and users often report that the feature builds trust in the product while also helping them understand how DeFi works. Additionally, the DeFi Saver team is able to validate protocol integrations before production, making the process faster and more reliable. Finally, the team can also troubleshoot user issues faster and verify fixes before production. 

DeFi Saver is a non-custodial DeFi management tool that enables users to access and experiment with different strategies. It aggregates a wide set of protocols behind a single interface and acts as an advanced toolkit for position management on top of them. Some of its most recognized features include Auto-Boost and Auto-Repay, which enable users to automate strategies through DeFi Saver.

DeFi Saver lets users manage their DeFi portfolios and execute strategies from a comprehensive platform. While a native protocol UI handles one action at a time, DeFi Saver handles the entire strategy, bundling multiple actions within a single transaction.

To make decentralized finance more accessible to end users and build trust and confidence in their platform, the DeFi Saver team integrated Tenderly’s simulation technology. By enabling users to verify the outcome of every financial decision that goes through their platform, the team has made DeFi more approachable and transparent while improving user experience and speeding up internal processes. 

Bridging the gap between DeFi complexity and user trust

By aggregating multiple protocols, such as Aave, Compound, Liquity, Morpho, Spark, and Sky, into one unified platform and enabling users to bundle several actions into a single transaction, DeFi Saver significantly abstracts the complexity of decentralized finance for its users. 

However, a single transaction can interact with multiple protocols underneath and depends on the dynamic nature of blockchain conditions. Given this complexity, the DeFi Saver team needed to build confidence into their platform without requiring users to simply trust the interface.

"Our app is pretty complex, so users would like to verify how it actually works and get familiar with certain protocols or features, as well as all its capabilities, before actually putting their own funds on the line." – Nebojša Majkić, Product Manager

Having used Tenderly from the start, initially relying on its industry-recognized Debugger, the DeFi Saver team quickly integrated simulations into their product. Today, Tenderly’s simulation capability is the underlying layer for the entire organization, with DeFi Saver’s Solidity, frontend, backend, QA, and support teams all using Tenderly across their operations.

Modeling complex strategies before user capital is on the line

Aiming to give users confidence when interacting with the platform, DeFi Saver integrated Tenderly’s simulations as a user-facing feature. By enabling “simulation mode” in the product, the team built a verification step as one of the product’s core functionalities. 

As complexity is what stops people from committing capital in the first place, a simulation-powered sandbox environment removes the uncertainty that comes with it. The integration enables users to experiment with different strategies and see the results before committing real capital onchain. 

“Simulations improve the user experience by making DeFi more transparent and approachable. It helps our users understand what will happen before they execute a transaction, which builds trust and makes complex DeFi operations easier to navigate.” – Nebojša Majkić

When a user enters simulation mode, they create a private network replica on Tenderly, forking a chain at a specific moment. This replica acts as their private playground, where they can faucet an unlimited amount of funds and use them to interact with any protocol they want.

"Simulation mode offers new users, who are scared by the complexity of DeFi, a playground to test things out before committing to DeFi Saver. In the same way, it also helps existing users who want to test out different protocols or simply verify the outcome of a single transaction." – Nebojša Majkić

Then, DeFi Saver’s users can simulate and preview any action on the platform. For recipes chaining flash loans, swaps, and position changes across protocols, a user can run a simulation, open the result on Tenderly, and inspect the outcome, from balance changes to full EVM execution. 

Understanding DeFi with simulations

Aside from being recognized for the simulation functionality and the transparency it brings, the DeFi Saver team also contributes to making decentralized finance more accessible. Their users report that simulations help them understand how DeFi itself works, with one US university professor using simulations to teach students about lending and borrowing protocols.

"Simulation remains one of DeFi Saver's most prominent features, especially valuable when onboarding new users. Beyond its practical benefits, it also plays an important educational role." – Nikola Janković, CMO at DeFi Saver

Simulations as a validation step for faster & reliable protocol integrations

DeFi Saver runs on top of multiple protocols, enabling their users to run strategies across any of them from a unified interface. For the DeFi Saver team, the protocol integration process requires carefully validating the entire system before running it in production. 

When expanding protocol support, DeFi Saver first simulates the integrations using Tenderly. This way, they can surface potential issues, stress-test the integrations against a range of different scenarios, and minimize the risk of critical failures in production. Ultimately, this process enables the team to integrate new protocols faster. 

"Tenderly allows us to experiment with different parameters and simulate a wide range of scenarios ahead of time. That means when the protocol does go live, much of the groundwork is already done, making the integration process significantly faster, smoother, and more reliable." – Nebojša Majkić, Product Manager

For this purpose, DeFi Saver uses Virtual Environments and enables protocol validation across teams. While local frameworks test Solidity code in isolation, a shared environment gives access to other teams, enabling shared usage, testing, and collaboration. 

"Foundry is primarily used for testing Solidity code. However, when you need your Solidity code to be used and interacted with by other teams, you need Tenderly." – Nebojša Majkić, Product Manager

The team uses Tenderly to simulate a transaction, inspect the execution logs with Debugger, and verify that it won’t revert before sending anything to production. 

“Tenderly plays a great role as the industry’s most prominent debugger. It helps speed development up, as well as aids devs in finding bugs mid-production.” – Nebojša Majkić, Product Manager

Faster issue resolution in production

Since simulations are an integral part of DeFi Saver’s internal processes, the team also uses them for issue resolution across customer support and engineering. The team runs real-time alerts for failed user transactions onchain, surfacing issues as soon as they happen.  

"We have alerts that track users’ transactions that fail. When one does, we use Tenderly's Debugger to investigate exactly why the transaction reverted or failed." – Nebojša Majkić, Product Manager

The support team quickly confirms what happened and answers the user, while engineering picks up the issues that require in-depth investigation. Then, they analyze the failure in Tenderly, diving into the execution trace to understand the exact reason behind it.

"The support team uses Tenderly to quickly verify any reports of issues. Then, one of the dev teams would take it from there to dive in and find the actual source of the issue." –  Nikola Janković, CMO

Key results

By integrating Tenderly’s simulations across internal processes and within the product, DeFi Saver enabled both its teams and end users to validate every decision, preview its outcome, and move onchain with confidence.

• Strategy validation before committing capital: Around a third of users regularly enter simulation mode before taking action. They can preview single transactions, model complex strategies, and experiment with new protocols. This way, users can verify the outcomes before their assets are at stake. Over the past year, Virtual Environments accounted for 76% of DeFi Saver's activity on Tenderly, with over 42 million API calls.
• User trust and confidence in the product: By enabling this functionality in their product, DeFi Saver removes uncertainty for their users, enabling them to get to know the functionalities and interact with their product with confidence. More than 114,000 transactions were submitted inside Virtual Environments over the past year.
• Faster and smoother protocol integrations: Modeling parameters and scenarios ahead of a deployment enables the DeFi Saver team to validate the integration before it goes live, making the process faster and more reliable.
• Prompt issue resolution and better customer support: Alerts on failed transactions and execution traces let support confirm what happened immediately while engineering can troubleshoot the issues in depth and validate fixes. Tenderly ran over 13 million monitoring evaluations for DeFi Saver over the past year, averaging more than a million a month.
• User onboarding and education: Users report that simulation helped them understand DeFi mechanics beyond DeFi Saver itself, including classroom use by a US university professor teaching lending and borrowing protocols.

Model and validate before user capital is on the line

Over the years, DeFi Saver has been committed to bringing onchain finance closer to everyday users. By aggregating different protocols within a single platform and enabling users to interact with them safely, the team built a complex onchain system, yet still ensures clarity, transparency, and confidence for their users. 

Tenderly has been a long-term partner for DeFi Saver, enabling the underlying technology that makes this possible. It enables both DeFi Saver’s end users and internal team to model every action before any capital is exposed.

For DeFi Saver, this mission remains the foundation for what comes next.

"We are continuously expanding support for new protocols and strategies, and aim to cover as many DeFi use cases as possible. As the ecosystem grows, simulation will remain a critical part of how we build and deliver new features safely. It allows us to test integrations, experiment with different scenarios, and catch potential issues before they impact users." –  Nikola Janković, CMO

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