Question: Is there a service that allows me to monetize my data by providing a subscription-based GraphQL API?

If you want to make money off your data by offering a subscription-based GraphQL API, Ocean is a good option. It's a full-fledged platform for monetizing AI models and data while protecting privacy with tokenized data and AI services. It supports Data NFTs with controllable access and encryption, Datatokens for token-based permissioning, and Compute-to-Data for performing computations on data without having to move it. That's good for token-gated AI dApps and APIs, and it's designed for a decentralized data marketplace.

Another powerful option is ROQ. ROQ offers a collection of features for building multi-tenant, multi-role SaaS applications. That includes secure database queries, user authentication, authorization and monetization through Stripe integration. With managed Postgres database deployment and AI-boosted data modeling, developers can rapidly develop, deploy and manage secure, scalable and resilient SaaS applications.

Supabase is also an option. This open-source Firebase alternative lets developers build production apps with a Postgres database, user authentication and real-time subscriptions. It supports frameworks like Next.js, Svelte and Flutter, and offers features like instant APIs, a built-in user management system and edge functions for custom code. Supabase's pricing includes a free tier with unlimited API requests and various plans for increasing needs.

If you prefer a more graph-based approach, Grafbase offers a unified graph platform that lets developers assemble multiple data sources into a single graph. It offers modern tooling for building and deploying GraphQL APIs, federation and sophisticated security. With a usage-based pricing model, Grafbase offers flexibility and scalability to integrate with a wide variety of tools and services, good for deploying APIs at the edge or on-premise.