MantleDB

A hosted JSON key-value store that lets users store and retrieve JSON at any path without accounts, schemas, or servers to configure, solving lightweight storage for quick experiments. It is for developers building side projects, prototypes, and quick hacks, including individuals and small teams needing simple persistence without database setup. It is delivered as a free HTTP API accessible from any client, with unclaimed namespaces for open use and optional claiming for write protection.

Key features

• POST JSON to any path
• GET read from anywhere
• PATCH merge patches
• Atomic increments
• Field-level reads via query param
• Per-entry public/private visibility
• Namespace claiming with write-key
• Email-based key recovery
• Export namespace as JSON blob
• TTL expiry on entries
• Version history and rollback
• Webhooks on write and delete
• MCP-compatible AI memory integration