[Proposal setup] Proposal title

Please provide your proposal title

VESPR: WalletConnect Cardano Flutter SDK & VESPR Integration

[Proposal Summary] Budget Information

Enter the amount of funding you are requesting in ADA

75000

[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?

Cardano lacks WalletConnect Flutter SDK while 70% of users prefer mobile for finance. Without this standard protocol, Cardano dApps can't effectively reach mobile users, limiting ecosystem growth.

[Proposal Summary] Supporting Documentation

Supporting links

• https://vespr.xyz
,
• https://github.com/vespr-wallet
,
• https://x.com/vesprwallet
,
• https://projectcatalyst.io/funds/11/cardano-open-developers/open-source-ledger-nano-x-flutter-sdk-and-vespr-wallet-integration

[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

MIT License - SDK will be free for both Personal and Commercial Use

[Theme Selection] Theme

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

Infrastructure

[Campaign Category] Category Questions

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

MIT License. We chose MIT for maximum adoption potential. It's the most permissive license that allows both commercial and non-commercial use without restrictions.

.............................

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

Development will be fully public from day one with code on GitHub, allowing the community to follow progress in real-time throughout the entire development phase. We'll announce milestones and updates on our X account (strong Cardano community reach) and reference the SDK on our main GitHub page for discoverability. Upon completion, the SDK will be published to pub.dev (Flutter's official package repository) and remain free with no usage restrictions.

How will you provide high quality documentation?

Our team members each have over a decade of experience in fintech, medical software, and top global corporations. We understand the critical importance of high-quality documentation. We will follow Flutter's official package guidelines with a comprehensive README including installation and quick-start guides.

[Your Project and Solution] Solution

Please describe your proposed solution and how it addresses the problem

Understanding the Problem

The financial services industry has undergone a massive mobile transformation. In 2015, only 30% of users managed finances primarily on mobile devices. By 2025, this has surged to over 70% of users preferring mobile for all financial activities—banking, investing, budgeting, and increasingly, Web3 interactions. This mobile-first reality demands that Cardano prioritize mobile infrastructure.

While explicit demand for WalletConnect on Cardano is still emerging, VESPR's success proves build mobile infrastructure right, and adoption will follow. As Cardano's leading mobile wallet and only self-sustaining wallet, we've validated that superior mobile infrastructure drives adoption.

Flutter has decisively won the cross-platform race, 3.3% of Stack Overflow questions vs React Native's 1.6%, with Google Trends showing Flutter dominance since 2021. Yet Web3 tooling remains JavaScript-based, creating a critical gap.

Supporting Charts:

• Mobile Adoption Growth (10% to 70%) - https://vespr-content.fra1.cdn.digitaloceanspaces.com/catalyst-f14/mobile%20adoption.png))
• Flutter Stack Overflow Dominance - https://vespr-content.fra1.cdn.digitaloceanspaces.com/catalyst-f14/flutter%20stackoverflow.webp)
• Flutter Google Trends Leadership - https://vespr-content.fra1.cdn.digitaloceanspaces.com/catalyst-f14/flutter%20google%20trend.webp)

Approach to the Solution

We will develop a production-ready Flutter SDK for WalletConnect v2 with Cardano-specific optimizations, handling session management, transaction signing, and CIP-30 compatibility.

Why us? We created Cardano's entire Flutter ecosystem:

• Cardano Flutter SDKs: Core infrastructure equivalent to CSL for JS (self-funded, 2+ years production)
• Ledger Flutter SDK: Only stable Ledger SDK for any blockchain (Fund 11)
• Ledger Cardano Flutter SDK: Only Cardano-specific Ledger integration (Fund 11)
• Integration SDKs: Connecting Flutter, Cardano, and Ledger ecosystems

Development will be public from day one on GitHub (MIT license). We'll deliver a pilot integration in VESPR Wallet at zero cost to prove production readiness.

Engagement and Beneficiaries

Direct Beneficiaries:

• Cardano dApp Developers: Finally able to reach mobile users through standardized protocol
• Flutter Developers: Can build Cardano wallets with industry-standard connectivity
• Existing Cardano Wallets: Add WalletConnect support without building from scratch
• Mobile Users: Access Cardano dApps with consistent, secure connection experience
• The Broader Ecosystem: Standardization reduces fragmentation and improves interoperability

Mobile-First Impact:

With 70% of users mobile-first, VESPR's success as Cardano's leading mobile wallet proves users choose superior mobile solutions when available. We're creating infrastructure that enables markets to emerge.

Security Benefits:

Mobile OS provide sandboxed apps, secure hardware chips, isolated environments, and minimal malware exposure, dramatically improving user safety.

Demonstrating Impact

Success will be measured through concrete adoption metrics:

• SDK Downloads: Track pub.dev package downloads and GitHub activity
• dApp Adoptions: Cardano dApps adding WalletConnect support
• Developer Engagement: GitHub stars, forks, and community contributions
• Mobile User Growth: Track mobile wallet connections as percentage of total

The pilot integration in VESPR Wallet provides immediate validation in production with Cardano's leading mobile wallet.

Uniqueness and Importance

First and only WalletConnect Flutter SDK for Cardano, purpose-built with:

• Native CIP-30 compatibility
• Optimized Cardano UTxO and transaction handling
• Flutter-specific mobile optimizations
• Support for native tokens, metadata, certificates

Flutter dominates (2x React Native activity) but Web3 tools remain JavaScript-based. We recognized **mobile adoption was stifled by missing infrastructure, **so we built Cardano's entire Flutter ecosystem ourselves.

Result: VESPR became Cardano's leading mobile wallet, proving our thesis: build the proper mobile infrastructure, and adoption follows. This SDK improves on the Flutter stack for Cardano.

[Your Project and Solution] Impact

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

Value to the Cardano Community

The SDK delivers critical infrastructure for Cardano's mobile-first future:

Immediate Value:

• Expanding the Mobile Stack: WalletConnect is an extra critical piece of Flutter infrastructure for Cardano

• Mobile User Accessibility: Opens Cardano dApps to the 70% of users who prefer mobile

• Developer Alignment: Extends the Flutter ecosystem we created for Cardano

• Fixing the Tooling Gap: Bridges disconnect between Flutter dominance and JS-based Web3 tools

• Open Source Foundation: MIT license, like all our self-funded Cardano Flutter SDKs

Strategic Value:

• Global Trend Alignment: Cardano becomes a leader in its support for Flutter developers

• Enhanced Security: Mobile's sandboxed architecture protects users better than desktop

• Developer Trend Alignment: Supporting the framework that's actually winning (Flutter 2x React Native)

• Proven Model: WalletConnect's success in other ecosystems validates this approach

• Future-Proofing: Ready for continued Flutter dominance and mobile growth (85% by 2030)

The SDK represents essential infrastructure investment. Without it, Cardano cannot compete for the mobile generation that will define Web3's next decade.

[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?

Team & Track Record

We created Cardano's entire Flutter ecosystem:

• Cardano Flutter SDKs: Core infrastructure (self-funded, 2+ years production)
• Ledger SDKs: Only stable Ledger Flutter SDK globally + Cardano-specific version (Fund 11)
• VESPR: Cardano's leading mobile wallet

Core Tech Team: 30+ years combined experience in fintech and mobile development, with deep expertise in Flutter, Cardano integration, and production-grade financial applications.

We don't just understand Flutter-Cardano integration, we invented it.

Validation & Feasibility

Technical: WalletConnect v2 stable, all dependencies available, prototype validated.

Market: 70% mobile-first users, Flutter dominates (3.3% vs React Native 1.6%), VESPR proven as market leader.

Trust: Fund 11 delivered on time/budget, transparent milestones, pilot integration at our expense shows commitment.

[Milestones] Project Milestones

Milestone Title

Core SDK Development

Milestone Outputs

We will deliver a functional WalletConnect v2 client for Flutter with complete session management capabilities including pairing, approval, and disconnect flows. The SDK will implement full transaction signing with CIP-30 compatibility, supporting all standard Cardano transaction types. Basic documentation will cover installation, setup, and core API usage to enable developers to start integration immediately.

Acceptance Criteria

The SDK must successfully establish and maintain WalletConnect sessions with test dApps, demonstrating stable connection handling. It must sign Cardano transactions correctly, with proper witness generation and CBOR serialization. All CIP-30 standard methods must be implemented and functional, including address retrieval, balance queries, and transaction submission.

Evidence of Completion

• GitHub repo with working SDK code

• Video showing transaction signing from test dApp

• Screenshot of successful WalletConnect session

Delivery Month

3

Cost

35000

Progress

50 %

Milestone Title

Productizing SDK & Publishing

Milestone Outputs

We will make sure the SDK codebase matches production standards with clean architecture and proper separation of concerns. We will finalize technical debt left from the development phase. Comprehensive unit tests will be added covering core functionality. The SDK will be optimized for performance with efficient connection management and minimal memory footprint. A complete README will provide quick setup instructions, basic usage examples, and API overview. A demonstration video will showcase the connector in action, and the polished SDK will be published to pub.dev for community access.

Acceptance Criteria

The codebase must follow Flutter best practices with proper null safety, type definitions, and documentation comments for all public APIs. Unit test coverage must cover relevant parts of the codebase. The README must include installation instructions, initialization code, and at least a simple use-case. The demonstration video must show successful WalletConnect pairing and transaction approval. The package must be successfully published to pub.dev with proper semantic versioning, package description, and changelog documenting all features.

Evidence of Completion

• Link to published package on pub.dev

• Links to unit tests in GitHub and screenshot of them passing

• Video demonstrating WalletConnect working

Delivery Month

5

Cost

30000

Progress

90 %

Milestone Title

Pilot Integration & Close-out

Milestone Outputs

We will complete a pilot integration of the WalletConnect SDK into VESPR Wallet, demonstrating production readiness with Cardano's leading mobile wallet. This integration will be delivered at zero cost to Catalyst, showcasing our commitment to the ecosystem. Additionally, we will prepare the Catalyst Final Report documenting project outcomes, lessons learned, and future roadmap, along with the Catalyst Close-out Video presenting the delivered solution.

Acceptance Criteria

VESPR Wallet beta build must successfully establish WalletConnect sessions. The integration must handle CIP-30 methods without errors. The Catalyst Final Report must comprehensively document all milestones achieved, metrics collected, and community impact. The Close-out Video must demonstrate the completion of this SDK and the pilot integration.

Evidence of Completion

• Screenshot: VESPR connecting via WalletConnect

• Link to Catalyst final report

• Link to Catalyst Close-out Video

Delivery Month

6

Cost

10000

Progress

100 %

[Final Pitch] Budget & Costs

Please provide a cost breakdown of the proposed work and resources

Development Team (6 months)

• Senior SDK Developer: 50 days @ $560/day = $28,000
• Flutter Developer: 43 days @ $560/day = $24,080
• Technical Architect: 17 days @ $700/day = $11,900

Documentation & Testing

• Technical Writer: 11 days @ $350/day = $3,850
• QA Engineer: 14 days @ $420/day = $5,880

Project Management

• Project Manager: 3 days @ $350/day = $1,050

Total Budget

Total: $74,760 USD (~75,000 ADA at 1:1 rate)

Milestone Distribution

• Milestone 1 (Core SDK): 35,000 ADA (47%)
• Milestone 2 (Production Ready): 30,000 ADA (40%)
• Final Milestone (Pilot & Close-out): 10,000 ADA (13%)
• Note: Pilot integration delivered at zero cost to Catalyst

[Final Pitch] Value for Money

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

Our budget of $75,000 represents 50-70% below market rates for SDK development ($150,000-$250,000 industry standard), achieved through leveraging our existing Cardano Flutter libraries and proven Ledger SDK patterns. The team previously delivered Fund 11's Ledger SDK on time and within budget.

Ecosystem Multiplication Effect: One SDK enables unlimited wallet integrations, with each bringing their entire user base to WalletConnect-enabled dApps. This creates a standard preventing fragmentation while reducing future development costs across the ecosystem.

Strategic Positioning: This completes the Flutter infrastructure VESPR created for Cardano, making it the first blockchain with comprehensive Flutter support (SDKs + WalletConnect). With Flutter dominating cross-platform development (2x React Native activity) and Catalyst's own dApp using Flutter, this positions Cardano where developers are actually going.

Risk Mitigation: WalletConnect v2 is stable with no dependency risks. VESPR guarantees first integration at zero cost to Catalyst, proving the model. MIT licensing removes adoption barriers, and our conservative timeline includes buffers.

The combination of below-market pricing, proven execution, guaranteed pilot integration, and ecosystem-wide benefits makes this exceptional value, critical infrastructure that will serve Cardano for years.

[Required Acknowledgements] Consent & Confirmation

Terms and Conditions:

Yes