KeyChain Pay is the first-ever Smart Rental Payment Platform in Hong Kong, providing a trusted platform for landlords and tenants to easily manage rent payments. The platform supports various payment methods and uses AI to perform Know Your Customer (KYC) checks, transaction monitoring, and credit scoring. Through machine learning, KeyChain Pay computes proprietary credit scores for tenants and uses smart contracts to collect rent and disburse payments from tenant credit cards in advance, ensuring landlords receive their rental income on time and boosting cash flow. This innovative solution disrupts traditional tenancy management by eliminating rental arrears in an automated manner.