Prompt Pay – Per-API Monetization on Arc

Prompt Pay is a real-time per-API monetization system built for the Agentic Economy using Arc’s nanopayment infrastructure. It allows developers to charge as little as $0.001 per AI API call, with instant onchain settlement in USDC. Traditional API monetization models fail due to high gas fees, making microtransactions unprofitable. Prompt Pay solves this by leveraging Arc’s feeless or ultra-low-cost transaction system, enabling true pay-per-use economics for AI services and machine-to-machine interactions. The platform includes a test wallet system, per-call pricing enforcement, real-time transaction logs, and a bulk testing environment to simulate multiple API calls. Each request is only processed after successful payment confirmation, ensuring a secure payment-first access model. This project demonstrates how AI APIs, agents, and digital services can operate under a scalable microtransaction model. It highlights the future of decentralized monetization, where every action has value and can be settled instantly without traditional financial friction.