PromptPay

PromptPay is a decentralized, blockchain-based marketplace designed to empower AI prompt engineers by enabling them to monetize their expertise through the sale of high-quality AI prompts. It functions like an "App Store for AI prompts," where creators can upload and securely store prompts encrypted on Filecoin, showcase sample outputs generated by various AI models such as GPT-4, DALL-E, and Midjourney, and set prices payable in PYUSD.

The platform solves two major problems: prompt creators currently lack a reliable monetization channel and must share their valuable prompts for free, while users spend excessive time crafting prompts or fail to replicate trending AI-generated content due to lack of access to quality prompts. PromptPay offers instant prompt purchases with stable, low-fee PYUSD transactions, global access without traditional payment barriers, and instant delivery of decrypted prompts.

Built on Flow and Sepolia blockchain, PromptPay ensures fast, cheap, and secure transactions with upgradeable smart contracts managing prompt ownership, purchases, and payments. Prompt data is encrypted and decentralized using Filecoin and IPFS, maintaining privacy until purchase and preventing piracy. Buyers can browse prompts by category and AI model, preview real prompt outputs, and rate prompts to maintain quality.

PromptPay is deployed on the Flow/Sepolia blockchain, leveraging its fast, low-cost transactions and the PYUSD stablecoin for instant, stable payments. Solidity smart contracts handle prompt ownership, purchases, and automated payment distribution with an upgradeable design for future enhancements.

Currently, the platform supports the Nano Banana AI model exclusively, with plans to integrate additional models like GPT-4, DALL-E, Midjourney, and Claude in upcoming roadmap phases. Prompt creators upload prompts with sample outputs generated on Nano Banana, which buyers can preview before purchase.

Prompts are securely encrypted and stored on Filecoin, ensuring privacy and intellectual property protection until purchase completion. IPFS is used for decentralized, fast prompt content delivery globally, with server-side encryption/decryption providing robust security protocols that give prompts the enterprise-grade protection they deserve.

The responsive web app front end includes secure privy wallet integration, enabling users to create profiles, upload prompts, browse listings, and transact seamlessly. Caching and anti-fraud layers boost performance and maintain marketplace integrity.

This architecture combining PYUSD, Filecoin storage, and Nano Banana AI model creates a scalable, secure, and creator-centric marketplace, with a clear roadmap to expand AI model support and platform capabilities.