Hasura

Instant GraphQL and REST APIs generated on top of an existing database, so schemas, queries and mutations are derived from your tables instead of being written by hand. The engine supports fine-grained authorization rules, live subscriptions, custom actions and remote schema stitching to combine several services behind one endpoint.

Teams use it to expose a clean API to frontends, mobile apps and partners without maintaining a separate API service.

Self-hosting it keeps the database behind your own network boundary, avoids metered API pricing as traffic grows, and gives you a straightforward schema to snapshot, migrate and restore.