> For the complete documentation index, see [llms.txt](https://docs.zyfi.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zyfi.org/integration-guide/case-studies/case-study-gravita.md).

# Case Study: Gravita

Drawing on the successful integration by Gravita Protocol, one of Zyfi's early adopters, we've distilled valuable insights into effective UI practices. User demand for Paymaster is [constantly increasing as it can be seen from this Dune Dashboard.](https://dune.com/zyfi/zyfi-usage-overview)

<figure><img src="/files/FU1xx9GF5cAWKJxUIt2g" alt=""><figcaption></figcaption></figure>

## **Advantages**

* **Wide Token Acceptance**: Supports more than 80 ERC-20 tokens.
* **Transparent Fees**: Users see and approve only the exact amount needed, which is available upfront, optimizing costs and security.
* **Gas Refunds**: Unspent gas is refunded in the fee token it was paid in.
* **Instant Quotes**: The API delivers real-time fee quotes and discounts, improving user experience.

## **UI and UX implementation - Overview of Best Practices**

Unlock the full potential of your platform with simply crafted UI enhancements and additions:

1. **Add a tooltip with a Gas Icon and Display the Wallet Balance of the user**:
   * Ensure the user's wallet and token balances are easily visible near this icon.
2. **Spotlight on Paymaster Service - Clear Indicators for Paymaster Availability**:
   * Utilize eye-catching elements like colour contrasts or animations shining a spotlight on the revolutionary and cutting-edge paymaster service availability.
3. **Highlighting Savings: Unveil Discounts with Clarity**

   * Clearly display any discounts on gas fees available through the paymaster service.
   * Use visual cues like percentage-off tags or highlighted text to indicate savings.

   This approach not only highlights a key advantage your protocol offers compared to competitors, but also gives users a solid reason to return and transact more, driving even more engagement with your protocol.

<div align="center" data-full-width="false"><figure><img src="/files/nWoVkRmpe6vAEk0AAMnh" alt=""><figcaption><p>Zyfi and it's partners are happy to sponsor a discount on transaction fees for the first users</p></figcaption></figure></div>

## **Additional Considerations - Optional**

* **Zyfi Airdrop Participation:** users executing transactions through Zyfi will receive an airdrop from the protocol. A dashboard will soon be available with more information about this program.&#x20;
* **Remember User Preferences with Cookies**: Utilize cookies to save user preferences for future visits - consider not displaying the "Attention-Getter" or popup again or for a certain amount of time if the user closed it previously. When a user selects a token for gas payment, store this choice so that it's pre-selected upon their return, streamlining their experience.
* **Feedback Mechanisms**: Implement real-time feedback on gas fee calculations, discount and sponsoring as users select different tokens, or after they complete a transaction.
* **Documentation:**  you can also write your own documentation, [feel free to get inspired by Gravita's one linked here.](https://docs.gravitaprotocol.com/gravita-docs/how-does-gravita-work/paymaster-on-zksync)
* **Mobile**: Ensure that all elements are accessible and usable, without forgetting mobile users.

<figure><img src="/files/DfoWVNVUb2f20lm6XJa2" alt=""><figcaption><p>Do not forget mobile users!</p></figcaption></figure>

## **Conclusion**

In conclusion, embracing these best practices guarantees a seamless and efficient experience for users paying gas on your protocol with any ERC-20 token, including your token!&#x20;

[Check out our Dune Dashboard](https://dune.com/zyfi/zyfi-usage-overview) to see how much utilisation of Paymaster Services has increased over time.\
\
Consider extending the use of your token as a gas payment option to your partners and across zkSync: ZyFi works with DEXes, lending platforms, NFT marketplaces, gaming ecosystems and more.&#x20;