ReferralGateway is a deployable referral stack for EVM apps: a Solidity contract, Go API with blockchain indexer, and Next.js dashboards for referrers, sellers, and admins. Publish offers, track referral links, and pay rewards on-chain—with hold periods and dispute resolution built in. White-label UI, monitoring, and deployment docs included. Live demo on Sepolia. For Web3 marketplaces, DeFi teams, and integrators who need transparent partner payouts without building from scratch.