MLabs + J50 VENTURES: Playrz Responsible p2p Sports Platform

[Proposal setup] Proposal title

Please provide your proposal title

MLabs + J50 VENTURES: Playrz Responsible p2p Sports Platform

[Proposal Summary] Budget Information

Enter the amount of funding you are requesting in ADA

497369

[Proposal Summary] Time

Please specify how many months you expect your project to last

12

[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?

Mainstream gaming platforms are exploitative by design, mimicking addictive social media mechanics. Traditional sportsbooks use manipulative odds & margins, targeting users rather than rewarding skill

[Proposal Summary] Supporting Documentation

Supporting links

• https://www.mlabs.city/
,
• https://playrz.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?

No

License and Additional Information

NA

[Theme Selection] Theme

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

Gaming

[Campaign Category] Category Questions

Describe your established collaborations.

MLabs has forged impactful collaborations across the blockchain space and has assisted multiple ecosystem projects such as SundaeSwap, Minswap, Optim, Liqwid Finance, and IO through development and tooling contributions as part of broader Cardano community work. MLabs is well possitioned to take FeesaSwap's unique proposal to the next stage of development to scale out the remainder of work

Describe funding commitments.

MLabs is committing dedicated development resources to fully deliver the playrz.io platform according to the milestones we’ve defined. Funding will cover smart contract implementation, backend infrastructure, frontend development, mobile platform support, and promotion. Each milestone has clearly defined outputs, acceptance criteria, and evidence to ensure accountability. The total effort has been estimated and allocated to ensure the project reaches production-ready status, with contingency built in for testing, QA, and deployment.”

Describe your key performance metrics.

Success will be measured by user growth, aiming for 20,000+ beta testers in six months and 50,000–70,000 users in the first year; transaction volume, targeting 500,000–700,000 wagers per week; smart contract reliability and security; platform stability under high load; and active community engagement via wallet integrations and ecosystem partnerships.

[Your Project and Solution] Solution

Please describe your proposed solution and how it addresses the problem

Playrz is a community-first, responsible gaming, sports prediction platform, currently live on Arbitrum and preparing to migrate to Cardano. Instead of competing against a centralized operator, users face off against each other in peer-to-peer predictions with transparent, on-chain resolution and no hidden house edge.

At the core of Playrz is a sweepstakes-style game structure built around parlay wagering. Each “Game” corresponds to a real-world sporting event. Users buy fixed-price tickets and are presented with a “bingo card” of available parlay options and their associated odds. Players select a set of three predictions. After the event concludes, a decentralized oracle posts verified outcomes along with a ranked list of best-performing entries. The top 25% of players receive payouts - typically tripling their entry fee. Unique to the game structure is that players have the potential to enter competitions without losing their entry fee. This is achieved by staking their entry fee in a liquidity pool and thereby earning rewards which cover their entry fee. This creates the world’s first-ever, “no-loss” wagering game.

Unlike traditional prediction markets or tokenized casinos, Playrz is designed to encourage sustainable participation and fair competition. Gameplay mechanics are fully transparent, with provably fair odds and no ability for users to chase losses. Buy-ins are rate-limited to prevent users from overextending themselves, creating a safe, community-aligned environment.

The result is a blockchain-native experience that combines Cardano’s ethos of decentralization and fairness with the excitement of real-world sports. Polymarket has shown what predictions markets can do for Polygon but the significant global sports market remains relatively untapped in the blockchain environment to date. Playrz delivers skill-based gaming designed for broad participation, strategic depth, and long-term community growth while removing the addictive elements of wagering - a compelling proposition for an under-catered market.

[Your Project and Solution] Impact

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

Playrz will expand the reach of Cardano by onboarding new users from high-growth, underserved markets in India, Africa, Middle East and Southeast Asia—regions where sports fandom is thriving, mobile usage is exploding, and blockchain familiarity is rapidly increasing. By offering a responsible, skill-based gaming experience that resonates with local sports cultures, Playrz will serve as a gateway into Cardano for users who may have little to no prior exposure to the ecosystem.

We aim to significantly grow the Cardano user base by onboarding new users through an engaging, accessible platform, capitalizing on the booming interest in P2P interactive competitive entertainment. In particular, we will target:

Mass Adoption through Sports-Based Engagement: Sports prediction attracts a massive global audience, providing a compelling entry point to the Cardano ecosystem,particularly in the rapidly growing mobile gaming market of Africa. We project onboarding 50,000–70,000 new users to Cardano within the first year, each wagering $1 per game across 10 games per week. This translates to 500,000–700,000 weekly transactions, boosting Cardano’s transaction volume by approximately 2–3 million transactions monthly, assuming stable user engagement.

Community-Driven Engagement and Governance: Playrz will utilize social prediction pools and community-driven game moderation, empowering users and fostering decentralized governance. We will explore integrating with Cardano’s governance mechanisms, giving ADA holders a voice in the platform’s future development. This engagement will create a vibrant Playrz community that is also invested in the broader Cardano ecosystem.

Showcasing Cardano’s Strengths in Emerging Markets: Playrz’s initial focus on Africa, with plans to expand into the Middle East, then the USA, and Europe, will demonstrate Cardano’s ability to support real-world financial inclusion and gaming innovation. This will position Cardano as the blockchain of choice for ethical gaming solutions in emerging markets, attracting further development and investment to the Cardano ecosystem. For example, Polymarket, a prediction market on Polygon generated $3.3 billion in wagers on the 2024 U.S. election, driving Polygon’s visibility with 60+ markets and mainstream media coverage (e.g., Forbes, Wall Street Journal). Playrz aims to replicate this exposure for Cardano, leveraging Africa’s high P2P crypto volume (13% ownership in South Africa, 7% in Nigeria). We will actively share our experiences and successes in Africa with the Cardano community, contributing to the narrative of Cardano as a platform for positive global impact.

We will track and report on these metrics post-launch, contributing valuable data to the Cardano community.

[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?

This project brings together two highly complementary partners: J50 Ventures, a proven innovator in gamified sports products, and MLabs, one of the most trusted technical teams in the Cardano ecosystem.

J50 Ventures has spent the past three years building and refining gamified sports engagement products, including Playrz, which is already live on Arbitrum Experienced in product design, Web3 growth strategy, and user experience, J50 has demonstrated the ability to execute from concept to deployment across both Web2 and Web3 contexts.

MLabs has extensive experience working on Cardano developer tools and applications, including similar oracle-enhanced marketplaces. MLabs has a proven track record of contributing to leading dApps in Cardano ecosystem as well as core maintenance itself through our various CIPs, R&D projects, and so on.

Together, this team combines market-tested product expertise with Cardano-native engineering execution. J50 will drive the continued evolution of game logic, UX flows, and emerging-market user engagement. MLabs will implement the smart contracts, oracle integration, and NFT logic required to anchor the experience on-chain. Both teams have strong internal delivery processes, experience managing scoped milestones, and a shared commitment to transparency and accountability. The scope of the project, while ground-breaking and exciting, is clearly within our ability to technically deliver with limited delivery and timeline risk.

[Milestones] Project Milestones

Milestone Title

Smart Contract Implementation

Milestone Outputs

1. Implement GameDatum and OracleUTXODatum structures with validation logic.
2. Support ticket NFT minting, updates, cancellations, and cleanup.
   1. Enable claim verification, burning of NFTs
3. Post parlay outcomes and winners list on-chain.
4. Enable claim verification, burning of NFTs, and transfer/refund of winnings.
5. Enforce ticket purchase cutoff times and encode salted hashes for ticket verification.

Acceptance Criteria

1. Smart Contracts validate GameDatum and OracleUTXODatum correctly.
   1. Allow game status updates to smart contracts (excluding admin address & game_thread_token).
2. NFT policies operate according to identified rules.
   1. NFT is able to claim (verification)
   2. NFT is able to Mint on claim
   3. NFT is able to Burn on claim
   4. NFT is cancellable under correct parameters
3. Claims and payouts/refunds execute correctly and transfer to the appropriate wallet.
4. Create NFT restrictions that implement a cutoff time for creation
   1. Use salted hashes for game token, purchaser address, chosen parlay options

Evidence of Completion

1. Github repo of Smart Contract Source code
2. tests of policies demonstrating each rule functionality
3. Video walkthrough of testing
   1. transaction logs o examples of winner status, and claims
4. Tests created for Validation logic for
   1. payout
   2. Refunds
   3. Test Transactions of funds delivered to wallet on chain
5. Video walkthrough of testing for cutoff restrictions

Delivery Month

2

Cost

61254

Progress

10 %

Milestone Title

Chain Follower and Indexing

Milestone Outputs

1. Monitor Game, Ticket, and Oracle UTXOs in real-time.
2. Detect new games, ticket purchases, oracle postings, and claims.
3. Verify transaction settlement before updating the database.
4. Ensure accuracy and reliability of UTXO event detection.
5. Maintain logs for auditing and troubleshooting.

Acceptance Criteria

1. All relevant UTXOs are correctly detected and processed.
2. No database updates occur before confirmed transaction settlement.
3. Claim statuses are accurately tracked.
4. Logs capture all detected events for auditing purposes.

Evidence of Completion

1. Video Demonstration of monitoring logs/screenshots.
2. Test cases demonstrating correct event detection and DB updates.
3. Database snapshots confirming accurate claims.

Delivery Month

4

Cost

41843

Progress

20 %

Milestone Title

Backend Infrastructure & API

Milestone Outputs

1. Set up a backend server and indexer to support contract interaction.
2. Build centralized database for storing game data, salted hash mappings, claim statuses.
3. Implement API endpoints to:
   1. Serve game listings and statuses
   2. Serve parlay option metadata
   3. Assist in building valid ticket purchase transactions
   4. Provide claim instructions for winners/cancellations
   5. Support admin functions (game creation, updates, cancellations)
4. Integrate API with database to ensure persistent and reliable data tracking.
5. Add monitoring and logging for stability.

Acceptance Criteria

1. Backend server operational with high uptime.
2. Database correctly tracks salted hashes, claims, treasury withdrawals, and off-chain bet details.
3. API endpoints return accurate game data, metadata, and transaction instructions.
4. Admin functions operate successfully via the API.
5. Monitoring processes verified.

Evidence of Completion

1. Server log showing stable operation.
2. Screenshot of Monitoring dashboards confirming uptime.
3. Screenshot showing accurate retrieval of ticket/claim data.
4. Link to API documentation

Delivery Month

5

Cost

81960

Progress

40 %

Milestone Title

Mobile Platform & Wallet Integration

Milestone Outputs

1. Wireframes, user flows, and interactive prototypes.
2. Frontend implemented in React/JavaScript.
   1. Mobile-optimized UI/UX with leaderboards and spending caps.
3. Integrated Cardano wallets (at least Yoroi) for ticket purchases and claims.
   1. Credit Card Onramp integration for fiat on/off-ramp.
   2. Support for both self-custodial wallet flows and off-ramp transactions.
4. Testing of unit, integration, and user workflows.

Acceptance Criteria

1. Users can purchase tickets and claim rewards successfully.
   1. On-ramp/off-ramp transactions complete correctly.
2. Self-custodial wallet flows operate securely and without errors.
3. Integration with smart contracts functions as intended.

Evidence of Completion

1. Screenshot of transaction log for ticket purchases and claims.
2. Link to Frontend website
3. Video walkthroughs of wallet flows.

Delivery Month

7

Cost

125098

Progress

60 %

Milestone Title

Development & Testing (Core Build, Test Suite, Deployment Prep)

Milestone Outputs

1. A functional test suite covering critical protocol paths.
2. Audit report available online and highlighting any major findings.
3. Updated documentation on testing strategy and security issues noted

Acceptance Criteria

1. Test suite runs automatically and passes on CI/CD.
2. ≥80% coverage of critical protocol logic achieved.
3. Audit report made available online .
4. Documentation provided with test coverage summary and audit findings.

Evidence of Completion

1. Link to GitHub repository with test suite functions
2. Screenshot of CI results.
3. Link to Audit report or PDF of the file.
4. Video of testing coverage passing

Delivery Month

9

Cost

108705

Progress

80 %

Milestone Title

Mobile Platform & Wallet Integration

Milestone Outputs

1. Design mobile-optimized UI/UX
   1. with leaderboards and spending caps.
   2. Create wireframes, user flows, and interactive prototypes.
   3. Implement frontend using React/JavaScript.
2. Integrate Cardano wallets (e.g., Yoroi) for ticket purchases and claims.
3. Conduct testing: unit, integration, and user experience.

Acceptance Criteria

1. Frontend implemented in React/JavaScript.
   1. Wireframes, user flows, and interactive prototypes.
   2. Mobile-optimized UI/UX with leaderboards and spending caps.
2. Integrated Cardano wallets (at least Yoroi) for ticket purchases and claims.
   1. WinterPay integration for fiat on/off-ramp.
   2. Support for both self-custodial wallet flows and off-ramp transactions.
3. Testing of unit, integration, and user workflows.

Evidence of Completion

1. Link to github of Wireframes, prototypes, and frontend code.
2. Video walkthrough of frontend
3. Screenshots/video walkthroughs demonstrating full functionality.
4. Wallet integration logs and transaction confirmations.

Delivery Month

12

Cost

78509

Progress

100 %

[Final Pitch] Budget & Costs

Please provide a cost breakdown of the proposed work and resources

Budget/cost breakdown:

Milestone 1 - Smart Contract Implementation - 284 hours - 61254

Milestone 2 - Chain Follower / Indexing - 194 hours 41843

Milestone 3 - Backend Setup, Database and API - 380 81960

Milestone 4 - Testing framework and Audit - 580 125098

Milestone 5 - Front End UI/UX and Wallet Integration 504 108705

Milestone 6 - Marketing and comms 364 78509

Subtotal: 2306 hours @110 USD/hour = 253660 USD

Total (@ rate $0.51 USD / ADA): 497369 ADA

**In the interest of full transparency, please note we have applied a conservative USD/ADA exchange rate in pricing this proposal. This is to ensure our operations remain stable regardless of market conditions. Although we firmly believe the future of Cardano is bright, we recognize the price of ADA and all cryptocurrencies is inherently volatile. Our financial obligations are denominated in fiat. Most importantly, this includes the salary of our engineers whose hard work makes projects like this possible.

In the unlikely scenario of severe negative price movement beyond our forecasted rate, it is possible that MLabs may need to temporarily suspend work on this proposal until the market recovers. Rest assured, this decision would be made solely to protect our business's long-term viability and never taken lightly.

We appreciate your understanding and support, and we are excited to see what we can achieve together.

[Final Pitch] Value for Money

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

The MLabs + J50 Ventures: Playrz Responsible P2P Sports Parlay Platform proposal offers clear value for money by expanding a live, market-tested product and repurposing much of the existing infrastructure for Cardano. Rather than building from scratch, the development roadmap focuses on adapting proven game logic, integrating Cardano-native smart contracts and NFTs, and leveraging existing delivery pipelines. This allows the Cardano community to benefit from validated product development at reduced cost and with an accelerated timeline.

The partnership between J50 Ventures and MLabs ensures that both user engagement and on-chain execution are led by seasoned teams with a history of delivering high-impact, on-budget blockchain projects. Milestones are tightly scoped, minimizing delivery risk and enabling reliable progress across core functionality.

Overall, the budget reflects a lean, high-leverage build that introduces Cardano to a fast-growing yet targeted segment of global users tightly aligned with he goals and values of Cardano.

[Required Acknowledgements] Consent & Confirmation

Terms and Conditions:

Yes