x402-ISP-AI
AI investment advisor marketplace on x402
About
The problem it solves **Problem:** Traditional AI services require subscriptions, API keys, and centralized payment infrastructure. AI agents can't autonomously purchase services from other AI agents. **Solution:** - Users get personalized investment strategies without monthly subscriptions - AI agents pay each other directly using crypto micropayments (0.001 USDC per query) - No API keys, no accounts - just pay-per-use - Every payment is verifiable on-chain - Enables autonomous AI service marketplaces where agents discover and purchase expertise on-demand **Real-world use:** - Save for goals (car, house, education) with AI-optimized DeFi strategies - Get professional investment advice for pennies instead of $99/month - Demonstrates how AI agents can form autonomous economies
How it's made
Challenges we ran into **Challenge 1: Understanding x402 payment flow** - Problem: x402 interceptors abstract away the payment logic - hard to debug - Solution: Built manual implementation first to understand signature verification, then used libraries **Challenge 2: Coordinating two AI agents with real payments** - Problem: Ensuring Expert AI only responds AFTER payment verification - Solution: x402-express middleware blocks requests until on-chain payment confirmed via facilitator **Challenge 3: Smart contract gas optimization** - Problem: Multiple protocol deposits in one transaction expensive - Solution: Batched all allocations (Aave, Compound, Uniswap) in single `createSIPPlan` call **Challenge 4: Testnet funding coordination** - Problem: Needed USDC for buyer, ETH for user, different wallets - Solution: Carefully separated concerns - buyer pays Expert AI, user funds investment