Multi-chain wallet SDK for Cardano interoperability

[Proposal setup] Proposal title

Please provide your proposal title

Multi-chain wallet SDK for Cardano interoperability

[Proposal Summary] Budget Information

Enter the amount of funding you are requesting in ADA

100000

[Proposal Summary] Time

Please specify how many months you expect your project to last

6

[Proposal Summary] Translation Information

Please indicate if your proposal has been auto-translated

No

Original Language

en

[Proposal Summary] Problem Statement

What is the problem you want to solve?

While Cardano wallets are excellent, most crypto users are on wallets like MetaMask and Phantom. These users are currently cut off from Cardano, limiting adoption and ecosystem growth.

[Proposal Summary] Supporting Documentation

Supporting links

• https://github.com/MynthAI
,
• https://www.mynth.ai/
,
• https://www.novaswap.io/

[Proposal Summary] Project Dependencies

Does your project have any dependencies on other organizations, technical or otherwise?

No

Describe any dependencies or write 'No dependencies'

No dependencies

[Proposal Summary] Project Open Source

Will your project's outputs be fully open source?

Yes

License and Additional Information

All materials and source code will be made fully open source under MIT License

[Theme Selection] Theme

Please choose the most relevant theme and tag related to the outcomes of your proposal

Cross-chain

[Campaign Category] Category Questions

Mention your open source license and describe your open source license rationale.

We will use the MIT License because it will keep things open, simple, and free for everyone. It will let people use and share without complicated rules, making it easier to work together and build on each other’s ideas in the future.

How do you make sure your source code is accessible to the public from project start, and people are informed?

All source code will be made publicly available from the very start on Mynth’s GitHub (https://github.com/MynthAI)) so anyone can access it at any time. We will share regular updates about releases, changes, and milestones on Mynth’s X and Discord channels to keep the community informed and engaged. This ensures full transparency, encourages collaboration, and makes it easy for people to follow progress and get involved.

How will you provide high quality documentation?

We will provide clear, well-structured documentation for all users, including easy-to-follow guides, examples, and visuals. Documentation will be written in plain language and organized so information is simple to find. We will use standard formats like Markdown and follow best practices to keep it accurate, consistent, and up to date, ensuring it’s useful for both beginners and experienced users.

[Your Project and Solution] Solution

Please describe your proposed solution and how it addresses the problem

We will build a universal, multi-chain wallet SDK designed to connect Cardano with the wallets most widely used across the blockchain space. While Cardano wallets such as Eternl, Lace, Typhon, GeroWallet, Yoroi, and Vespr offer excellent functionality, the reality is that the vast majority of crypto users interact through wallets like MetaMask (Ethereum, EVM-compatible), Phantom (Solana), and other chain-specific solutions. Right now, these users are effectively cut off from engaging with Cardano dApps without going through the additional friction of creating and funding a dedicated Cardano wallet.

Our SDK will solve this by acting as a single integration point for dApp developers, enabling them to instantly support multiple wallet types across Cardano, Ethereum, Solana, and more, without maintaining multiple codebases or complex custom integrations. This will be achieved by:

1. Unified API and Interface – Developers will integrate once and gain access to a consistent, chain-agnostic API for wallet connection, authentication, transaction signing, and balance retrieval.
2. Wallet Compatibility Layer – The SDK will include pre-built adapters for major wallets across ecosystems, including both Cardano-native and non-Cardano wallets. This includes Eternl, Lace, Typhon, GeroWallet, Yoroi, Vespr, MetaMask, Phantom, and others.
3. Plug-and-Play UI Components – We will provide ready-to-use components, such as a customizable wallet selector (as shown in our prototype), enabling developers to offer a familiar connection flow without building UI from scratch.
4. Cardano Integration Out of the Box – While the SDK will be multi-chain, it will have first-class support for Cardano, ensuring compatibility with CIP standards, transaction formats, and network-specific nuances.
5. Open Source & Developer Friendly – Released under the MIT License, the SDK will be fully open source, with comprehensive documentation, examples, and community support to encourage adoption and contributions.

Current Progress

We have already developed a prototype showcasing a functional wallet selector that lists and connects wallets from multiple chains, including Cardano, Ethereum, Solana, Sui, Hyperliquid, and others. This demonstrates the feasibility of the approach and provides a strong foundation for full-scale development.

Next Steps

With Catalyst funding, we will:

1. Complete the full wallet adapter library for the most widely used wallets across ecosystems.
2. Implement transaction handling, signing, and submission logic for each supported chain.
3. Develop extensive developer documentation, tutorials, and code samples
4. Conduct comprehensive testing to ensure reliability, security, and a smooth user experience.
5. Launch the SDK publicly with community outreach to encourage rapid adoption.

[Your Project and Solution] Impact

Please define the positive impact your project will have on the wider Cardano community

This solution directly eliminates the barrier faced by millions of non-Cardano wallet users who want to access Cardano dApps. Instead of requiring them to set up a new Cardano wallet, developers can meet users where they already are, letting them connect with the wallet they use everyday.

For example:

• A MetaMask user exploring DeFi could connect to a Cardano DEX without creating a new wallet.
• A Phantom wallet user could interact with a Cardano NFT marketplace in just a few clicks.

By meeting users on their existing platforms, we remove a major friction point in onboarding, dramatically expand the addressable user base for Cardano projects, and position Cardano as a seamlessly integrated part of the broader multi-chain Web3 ecosystem.

Increased Adoption

Lowering the wallet barrier opens Cardano to potentially millions of new users across Ethereum, Solana, and other blockchain communities. These users will have direct access to Cardano’s DeFi platforms, NFT markets, and other dApps without extra setup hurdles.

Developer Growth

By simplifying wallet integration into a single SDK, we reduce development time, complexity, and maintenance costs. This encourages more projects to build on Cardano and allows existing projects to expand their reach without costly technical rework.

Interoperability Leadership

By becoming one of the first ecosystems to offer seamless multi-wallet connectivity across multiple chains, Cardano will position itself as a leader in Web3 accessibility and interoperability, increasing its reputation in the broader blockchain space.

Measuring Impact

• User Adoption Metrics – Tracking the number of unique wallet connections from non-Cardano wallets to Cardano dApps.
• Developer Adoption – Monitoring SDK downloads, GitHub stars, and integration statistics from partnering dApps.
• Transaction Volume – Measuring the increase in transactions originating from non-Cardano wallets.
• Community Engagement – Gathering feedback from developers and end-users via GitHub issues, forums, and social channels.

Sharing Results

All code will be open-sourced on GitHub under the MIT License, with detailed public documentation and integration guides. Project progress, adoption metrics, and milestones will be shared regularly on Mynth's X and Discord.

[Your Project and Solution] Capabilities & Feasibility

What is your capability to deliver your project with high levels of trust and accountability? How do you intend to validate if your approach is feasible?

Our team has already proven our ability to deliver complex, high-impact projects with no external funding by successfully building Mynth from the ground up. Over the past two years, we have worked tirelessly to bring true interoperability to Cardano, designing and deploying foundational infrastructure that is already enabling cross-chain connectivity.

We are one of Cardano’s leading interoperability teams, with deep expertise in blockchain architecture, protocol integration, and wallet connectivity. Our prior work on Mynth has given us both the technical knowledge and the operational experience to deliver on this proposal efficiently and to the highest standards.

Our approach to project delivery is structured and accountable:

• Proven Track Record – Mynth was built entirely without outside funding, demonstrating our ability to manage resources responsibly and deliver results under constraints.
• Established Infrastructure – We have already built and deployed systems that handle real-world blockchain interoperability challenges.
• Experienced Team – Our developers bring years of experience in Cardano, cross-chain systems, and Web3 product delivery.
• Transparent Development – All code will be open-sourced under the MIT License, with regular progress updates shared publicly via GitHub, X, and Discord.
• Milestone-Based Execution – We will follow a clear, milestone-driven roadmap, ensuring that progress is measurable, funds are managed responsibly, and deliverables are completed on schedule.

Given our history, expertise, and established technical foundation, we are uniquely positioned to deliver this SDK quickly, reliably, and with full transparency to the Cardano community.

[Milestones] Project Milestones

Milestone Title

Project Setup & Licensing

Milestone Outputs

We will create a public GitHub repository for the SDK under the MIT License, including an initial README, contributing guidelines, license file, and basic folder structure. A high-level roadmap will be published in the repository to guide development.

Acceptance Criteria

The GitHub repository is publicly accessible, contains the MIT License file, and has a clearly written README describing the project’s purpose, scope, and roadmap. Contributing guidelines must be present for community involvement.

Evidence of Completion

A public link to the GitHub repository will be provided along with screenshots showing the repository structure, license file, and README. Commit history will verify the creation date and inclusion of required setup files.

Delivery Month

1

Cost

20000

Progress

10 %

Milestone Title

Core SDK Architecture & Wallet Adapters

Milestone Outputs

We will implement the SDK’s core architecture, providing a unified API for wallet integration, and develop adapters for all major Cardano wallets (Eternl, Lace, Typhon, GeroWallet, Yoroi, Vespr). This will form the foundation for future multi-chain expansion.

Acceptance Criteria

The SDK compiles without errors, connects successfully to each supported Cardano wallet in a working environment, and exposes clear, documented methods for wallet connection and transaction handling via a unified API.

Evidence of Completion

GitHub commits will show the implemented SDK architecture and wallet adapters. A demo video will demonstrate connecting to each Cardano wallet through the SDK interface. The repository will contain documentation for using the adapters.

Delivery Month

3

Cost

20000

Progress

50 %

Milestone Title

Multi-Chain Expansion & UI Components

Milestone Outputs

We will add support for popular non-Cardano wallets such as MetaMask and Phantom, and implement plug-and-play UI components, including a customizable wallet selector. Transaction signing and submission for all supported chains will also be included.

Acceptance Criteria

All listed wallets connect successfully in a functional environment. UI components render without errors, match intended design, and allow users to select and connect wallets seamlessly. Transaction signing must operate reliably.

Evidence of Completion

GitHub commits will document newly added adapters and UI components. A short demo video will show wallet selection, connection, and transaction signing across different blockchains. Documentation will explain how to integrate these components.

Delivery Month

4

Cost

20000

Progress

70 %

Milestone Title

Public Release & Documentation

Milestone Outputs

We will finalize and release the SDK under the MIT License on GitHub, complete with comprehensive documentation, tutorials, and integration examples. A public announcement will be made to drive adoption across the Cardano community and beyond.

Acceptance Criteria

The SDK must be fully functional with all supported wallets and include complete documentation covering installation, integration, and usage. The repository will clearly present integration examples for developers.

Evidence of Completion

A tagged public release (v1.0) will be published on GitHub, with hosted documentation linked in the README. Release announcements will be posted to X and Discord, along with a video walkthrough of the SDK in action.

Delivery Month

6

Cost

20000

Progress

90 %

Milestone Title

Project Close-out Report and Video

Milestone Outputs

At the end of the project, a short close-out report and a summary video will be prepared. The report will provide a clear overview of what was completed and the main results. The video will give a straightforward recap of the outcomes in an easy-to-follow way. Together, they will provide closure and serve as a record that the project has been completed.

Acceptance Criteria

This milestone will be complete once a written report and a video have been created. The report should confirm that the project is finished and summarize the key results. The video should give a simple overview of what was achieved. Both items together will mark the official close-out of the project.

Evidence of Completion

Evidence will consist of the final report and the summary video prepared at the end of the project. Having these two items will demonstrate that the work has been completed and the results have been documented in both written and visual form.

Delivery Month

6

Cost

20000

Progress

100 %

[Final Pitch] Budget & Costs

Please provide a cost breakdown of the proposed work and resources

Total Requested: ₳100,000

• Timeline: 6 months (≈ 26 weeks)
• ADA/USD conversion: ₳1 = $0.85 (for calculation reference)
• Total USD value: ₳100,000 × $0.85 = $85,000
• Volatility: ADA price fluctuations absorbed by our company; totals fixed in ADA
• Note: Actual costs exceed the request; our company will cover the shortfall

Development

• Market rate: $90/hour for an experienced blockchain/full-stack developer
• Hours: 40 hours/week × 26 weeks = 1,040 hours over 6 months
• Total: 1,040 × $90 = $93,600

Additional company overhead expenses excluded from budget

[Final Pitch] Value for Money

How does the cost of the project represent value for the Cardano ecosystem?

An open-source SDK that removes wallet incompatibility will make Cardano instantly accessible to millions of users from other blockchains, while giving developers a simple, free way to integrate them into their dApps. This will lead to measurable increases in participation, transactions, and overall ecosystem activity, creating lasting growth well beyond the project’s delivery.

[Required Acknowledgements] Consent & Confirmation

Terms and Conditions:

Yes