ACTUS Meets Ethereum: Enhancing Stablecoins with Automated Cash-Flow Settlement

This paper introduces a novel architecture that brings the Algorithmic Contract Types Unified Standards (ACTUS) to Ethereum by combining on-chain contract definition with off-chain deterministic computation and on-chain, oracle-mediated settlement. The design encodes ACTUS terms and life-cycle state in an ERC-20 stablecoin with balance locks, while a whitelisted multi-oracle computes cash-flows and settles them without manual intervention. This approach gives DeFi instruments bank-grade, standardized cash-flow semantics and auditable automation at low cost. In a three-year time-warp over a portfolio we measure \(\approx\) 60,000 gas per settlement ( \(\approx\$0.08\) ), with oracle throughput around 240 contracts/s on commodity hardware. Initial deployment is \(\approx\$3.74\) , and per-contract setup \(\approx\$0.48\) .