DataNexus

Autonomous Data Marketplace for AI Agents Solana × x402 × Irys × EigenAI

Live Demo: https://xdatanexus.vercel.app/

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Solana x402 Hackathon 2025

Tracks: x402 Agent Application | Trustless Agent | x402 API Integration

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What It Does

Decentralized Data Marketplace for AI Agents

DataNexus enables AI agents to autonomously trade data on Solana blockchain:

• Autonomous Trading: Agents search, purchase, and download datasets automatically via HTTP 402 protocol
• Custom Data Requests: Buyers post requirements, sellers bid, smart contract escrow ensures trustless delivery
• Data Protection: AES-256 encryption prevents leaks, only buyers get decryption keys
• Reputation System: On-chain trust scores (0-100) prevent rug pulls and fraud

Key Technologies: HTTP 402 protocol | Solana USDC payments | Irys storage | EigenAI inference (1M tokens) | Smart contract escrow

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Core Features

For Buyers

• Search datasets by category, price, provider reputation
• Purchase with USDC (one-time payment, unlimited downloads)
• Post custom data requests with budget and deadline
• Rate providers and dispute low-quality data

For Sellers

• Upload encrypted datasets to Irys (permanent storage)
• Set pricing and receive USDC payments directly
• Bid on custom data requests
• Build reputation score (0-100) and earn badges

For AI Agents

• Python SDK (3-line integration)
• HTTP 402 auto-detection and payment
• Automatic search, purchase, download, decrypt
• EigenAI verifiable inference integration

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How It Works

x402 Flow:

1. Agent requests dataset → HTTP 402 (payment required)
2. Agent pays USDC to provider's wallet
3. Agent retries with tx signature
4. Server verifies payment → returns data

Reputation Flow:

1. Provider uploads data → Irys (permanent storage)
2. System calculates score → 0-100 (sales, ratings, disputes)
3. High score (≥80) → SAS attestation (on-chain proof)
4. Agents verify provider → autonomous trust

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Quick Start

git clone https://github.com/gududefengzhong/datanexus.git
cd datanexus
npm install
cp .env.example .env.local
# Edit .env.local with your keys
npx prisma generate && npx prisma db push
npm run dev

Test x402 flow:

python examples/demo_x402_complete_flow.py

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Tech Stack

Frontend: Next.js 16, React 18, TypeScript, TailwindCSS Backend: Next.js API, PostgreSQL (Prisma), Redis Blockchain: Solana Devnet, Irys, SPL Token (USDC) AI: EigenAI (grant-based auth) Smart Contract: Anchor (PDA-based escrow)

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Architecture

AI Agent (Python SDK)
    ↓ HTTP 402
Next.js API + x402 Middleware
    ↓
Business Logic (Dataset | Payment | Reputation | AI)
    ↓
Data Layer (PostgreSQL | Redis | Solana)
    ↓
External (Irys | EigenAI | SAS | Helius RPC)

Hybrid On-chain/Off-chain:

• PostgreSQL: Fast queries (<100ms)
• Irys: Permanent storage (detailed data)
• Solana: Immutable proof (data hash)
• SAS: On-chain attestation (score ≥80)

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Project Structure

app/api/
  ├── agent/          # Agent endpoints (datasets, purchases)
  ├── datasets/       # Dataset management
  ├── disputes/       # Dispute resolution
  ├── ratings/        # Provider ratings
  └── providers/      # Reputation system
lib/
  ├── x402-middleware.ts      # HTTP 402 handler
  ├── reputation.ts           # Score calculation
  ├── onchain-sync.ts         # Irys + SAS sync
  └── eigenai-client.ts       # EigenAI integration
examples/
  ├── python-sdk/x402_example.py
  └── demo_x402_complete_flow.py
programs/escrow/              # Anchor smart contract

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Live Accounts

Smart Contract: gxDTeSCzk9kFbKTKVrWo4Ey1RZJ3K9698 (Solana Devnet) Irys: Permanent storage for datasets and reputation data SAS: On-chain attestation for providers with score ≥80

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Reputation System

Score (0-100): Base 50 + Rating + Sales - Disputes - Refunds

Badges: Verified | Top Seller | Trusted | High Quality | Reliable

On-chain Proof: Irys (storage) + Solana (hash) + SAS (attestation for score ≥80)

Anti-Fraud: Automatic refunds for failed downloads, dispute resolution for low-quality data

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Python SDK

3-line integration for AI agents:

from x402_example import SimpleX402Client

client = SimpleX402Client(api_key="...", solana_private_key="...")
datasets = client.search_datasets(query="DeFi", max_price=1.0)
result = client.download_dataset(dataset_id, auto_pay=True)  # Auto x402 payment

Test the complete flow:

python examples/demo_x402_complete_flow.py

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Documentation

See /docs for complete documentation including architecture, API reference, and deployment guides.

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Acknowledgments

Built with: Solana | Irys | EigenAI | x402 | Helius

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Contact

X: @rochestor_mu | Email: greennft.eth@gmail.com | GitHub: gududefengzhong/datanexus

License: MIT