Rosen Open Source

🌹 ROSEN APP

The Revolutionary Social Trading App - Seamless cross-border connections, powered by PYUSD & Google Cloud’s Blockchain RPC

• MIT License

• GCP Blockchain RPC

• PYUSD

• Gasless Seamless Borderless

🏆 Why ROSEN?

ROSEN is the first social trading platform powered by Google Cloud and PayPal PYUSD, designed to solve real-world problems:

🔥The Problem We Solve

Today, 95% of people globally face three brutal barriers when working across borders:

• Language Walls:
  • A Brazilian marketing manager lost business opportunities due to misunderstandings with Japanese clients, despite having valuable skills.
• Payment Friction:
  • A Nigerian designer paid $25 in fees to receive a $50 cross-border payment – 50% of the transaction value.
• Opportunity Exclusion:
  • A Venezuelan influencer could not receive international micropayments of less than $10 as a tip

ROSEN changes this with:

✅ AI-powered real-time translation

✅ PYUSD stablecoin for zero-fee microtransactions

✅ GCP Blockchain RPC ensuring 20-second settlements

ROSEN Home Page

For Users

✨ Polished Frontend: A user-friendly UX designed for non-crypto natives – no seed phrases, no gas fees, just Gmail login and go!

🌐 Cross-border focus,solve a real-world problem: Break down language barriers, unlock potential and opportunities for global social economy.

🔥 Gasless, seamless & instant transfers: Send PYUSD without paying gas (ROSEN covers fees!) to anyone in chat, just like sending a message! "Imagine tipping $10 as easily as sending a text"

🔒 Accessible & compliant: Live on the App Store and Google Play Store with a focus on compliant stablecoins

For Hackathon Judges

✅ PYUSD + GCP RPC:

Leverages Google Cloud’s Ethereum mainnet RPC for reliable, scalable and gasless transactions on app-native PYUSD with wallet abstract, which bring the real-world impact to ordinary people.

🎮 Key Features

Feature	Tech Stack	Competitive Edge
1-Click PYUSD Onboarding	WalletConnect + wallet abstract + GCP RPC	No crypto jargon – just Gmail + PayPal!
Gasless Social Trading	GCP Batch Transactions	Users pay zero gas for in-app transfers,solves microtransaction cost barrier
Cross-border seamless social trading	AI Translation + In-Chat PYUSD	Transfer stablecoins to anyone in chat - just like sending a message! Showcases real-world PYUSD utility
Multi-Chain Dashboard	React + Ethers.js	Prepares for future GCP analytics integration

⚙️ PYUSD & GCP Blockchain RPC Integration

How We Use Google Cloud:

• Ethereum Mainnet RPC:
  • Endpoint: https://blockchain.googleapis.com/v1/projects/YOUR_PROJECT_AND_KEY_HERE
  • Used for: PYUSD deposit/withdrawal transactions (low-latency confirmations).

How We Integrate PYUSD:

• Deposit, withdraw, tranfer PYUSD with 0 gas token

  • Uses GCP’s trace_block to verify PYUSD mint/burn events
  • Wallet abstraction hides contract calls from end-users

• Business Impact

Metric	Traditional Apps	ROSEN + PYUSD
Min. Transfer	$50+	$10
Fee per tx	$20+	$0
Settlement	1-5 days	20 sec
Compliance	❌ Unverified	✅ PayPal-backed

🛠️ Setup & Run

Architecture

Quick Start

You can download our App from App Store / Google Play for a quick experience.

And you can also download the Beta Version for new features such as PYUSD & GCP integrations.

Build & Run Client

cd client
npm i
npm run dev

Build & Run Server

1. requirements:

• golang >= 1.23.4
• mysql >= 8.0
• redis

2. build

cd server-contract
go mod download
go build

2. Edit config.yaml with your favorate editor. e.g. vim

vim config.yaml

3. Launch for first time.

./rosen-apiserver server --config config.yaml --migratedb yes

📈 Future Roadmap

• GCP-Powered Analytics:

  • Real-time PYUSD dashboards (BigQuery + Colab).
  • MEV monitoring via trace_transaction.

• PayPal On/Off-Ramps

  • Direct PYUSD purchase/withdraw when APIs launch

📜 License

MIT © ROSEN Team.

Judges, see our submission [video] (https://youtu.be/DrGheKvdocc) here for a gasless seamless PYUSD social trade demo!