About
MantleDB is a hosted JSON key-value storage API for storing arbitrary JSON objects at deep paths over HTTP. It supports POST for overwrite writes, GET for reads, PATCH for JSON Merge Patch updates, atomic increments, per-entry visibility controls, namespace listing, and namespace claiming with a secret key.
The free offering is an unclaimed namespace mode with no account required, plus claimed namespaces with write protection and 100 entries per namespace, 64 KB per entry, and 30 days of inactivity retention for unclaimed data or 90 days for claimed data. The service is aimed at prototypes, public config, shared state, and lightweight backend storage, with paid credits adding unlimited entries, 1 MB payloads, TTL expiry, history, webhooks, and export.
- HTTP JSON key-value storage
- No-account namespace access
- 100 entries per namespace
- 64 KB per entry limit
- 30-day unclaimed retention
- 90-day claimed retention
- Atomic increments and merge patches
- Per-entry public read controls
Free Tier Value
This free tier is genuinely usable for small projects, but it is capped at 100 entries and 64 KB per entry, with claimed namespaces still limited to the same size. The cheapest paid upgrade starts at $3 for 30 days, so the free tier is worth about $2/month in practical terms—roughly two-thirds of that entry-level paid value—while staying perpetual and not requiring a credit card.
What's included in the free tier
- Access to unclaimed namespaces with public read and write access.
- Claimed namespace access with write protection using an `X-Mantle-Key` secret.
- Up to 100 entries per namespace on the free tier.
- Up to 64 KB per entry on the free tier.
- Public read access for individual entries via `public_read`.
- Email-based key recovery for claimed namespaces.
- 30 days of inactivity retention for unclaimed namespaces.
- 90 days of inactivity retention for claimed namespaces.
See MantleDB pricing for current limits.
Paid plans
Credits
- days of credits
- 30 per $3 purchase
- entries
- unlimited
- payload per entry
- 1 MB
- webhooks per namespace
- up to 5
- history versions per entry
- up to 10
- Unlimited entries and 1 MB per entry
- TTL auto-expiry on writes
- Full version history and rollback
- Webhooks on write and delete
- Namespace inactivity clock paused while credits remain
- Full namespace export
Pricing extracted from MantleDB's pricing page. Always verify current pricing before committing.
