FairHold

Problem Statement

FairHold makes deposits feel fair and automatic. A vendor sets up a link in about a minute, picks simple milestones (like 40/20/40) and refund rules, and sends the link to the customer. The customer pays by card/Apple Pay or in stablecoins (USDC/PYUSD). Both sides see the same live timeline. Money is released when milestones are hit—or refunded automatically if the rules say so.Why this mattersIdle deposit money (often held for months) becomes transparent and programmable—and, if the vendor opts in, it can earn a conservative yield while it sits. Principal comes first.Fewer disputes: the terms are clear at the start and enforced by code, not email threads.Less admin: fewer manual refunds and chargebacks, plus automatic receipts and exports.We’re starting with weddings (NYC venues) and then expanding to property management, equipment/event rentals, and other high-ticket services—all on the same deposit rail.Example impact: A typical NYC venue deposit of $27,500 at 4% APR earns about $1,100 per deposit per year if held ~12 months. With ~100 bookings a year, that’s roughly $110,000/year in potential earnings (vendor opt-in, principal-first).

Solution

Stack overviewFrontend: Next.js (App Router) + TypeScript, Tailwind, React Query/Zustand, viem/wagmi.Wallets/Payments: Coinbase Developer Platform (CDP) for embedded wallets (clients/vendors) and server wallets (escrow automation). Card/Apple Pay on-ramps to USDC; transactions settle on Base Sepolia for the hackathon.Backend: Next.js API routes (Node/TS) with Prisma on Supabase Postgres.Storage: Cloudinary (images) + S3-compatible docs (signed URLs).Contracts: Minimal EVM contracts for policy-backed escrow + optional yield vault.Infra: Vercel deploys; env secrets stored in Vercel; monitoring hooks + basic analytics.Partner tech & benefitsCoinbase Developer Platform: instant embedded/server wallets, on-ramp, and gasless UX.USDC/PYUSD on Base: stable unit, fast settlement, cheap fees.Nora: Creating some pretty cool escrow contracts with their agent