I built Pact for the @sibyl_labs_ : an AI CFO that remembers your financial rules and can actually enforce them onchain. The idea is simple: You tell Pact: “I'm saving $2,000 for a MacBook.” Then: “You can spend up to $100 without asking me.” Later, in a completely new session: “Pay 60 USDC to Alice.” Pact remembers the rule, evaluates the payment, and if it's allowed, executes the payment from your personal vault on Base Sepolia. But the important part is what Pact doesn't do. The AI never gets your spending key. Instead: Memory → AI reasoning → deterministic policy engine → smart contract enforcement → payment Every payment is checked against your rules before execution, and the PactVault independently enforces spending limits, daily limits, and replay protection onchain. I built the system with: > Sibyl Memory for persistent, wallet-isolated financial context >FastAPI + Python for the agent and policy engine > Next.js for the interface >Solidity + Foundry for the vault infrastructure > Base Sepolia + USDC for real onchain payments The goal was to explore what financial agents should look like when memory and autonomy don't have to mean giving an LLM unrestricted control over your money. Pact is live. > Live App: > GitHub Repo: > Chain: @Base Sepolia USDC > Demo: Built for the Sibyl Memory × Base Sepolia Hackathon. CC: @tradingtulips @thnxforpaying @sibylcap