🏟️ Colosseum Frontier Hackathon @subly_fi Day 5🏟️ Designed a privacy layer for x402 payments on Solana (with AI today). x402 enables AI agents to pay for APIs via HTTP 402, but all payments are fully public on-chain. Anyone can see who paid whom and how much. Design: - Clients deposit USDC into a shared vault (mixing pool). More users → stronger anonymity - A TEE manages balances off-chain and batch-settles to providers on-chain - On-chain observers only see "Vault → Provider", not individual clients - The host is untrusted. TLS terminates inside the TEE - Audit logs are encrypted (twisted ElGamal + hierarchical keys) for selective disclosure - If TEE fails, funds can be recovered via on-chain force-settlement with a dispute window - Fully compatible with existing x402 HTTP 402 flow Still refining the architecture.
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