MantleDB

Free anonymous JSON key-value storage API with a built-in MCP server

Hosted JSON key-value store with no accounts or schemas. Write JSON to arbitrarily deep paths via REST, claim a namespace to add write-key protection, and use atomic increments, merge patches, field-level reads, per-entry public/private visibility, and email-based key recovery. Includes a hosted MCP server (mcp.mantledb.sh) with 7 tools so AI assistants get persistent memory. SQLite-backed; free tier allows 100 entries, 64 KB per entry, and 10,000 requests/24h; a paid tier adds TTL expiry, version history, webhooks, export, and higher limits.

Category: Databases & storage
Pricing: freemium · from $3/month
Free tier: yes
API: yes
MCP server: yes
SDK: no
Open source: no

#key-value store #json #rest-api #mcp #ai-agent-memory #no-auth #sqlite

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Listed 2026-10-23 · last verified 2026-10-23 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.95

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API

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