HeliosDB Cloud is the managed service for HeliosDB Nano at cloud.heliosdb.com. Each database runs SQL with vector search, branching and time-travel queries, and is reached through a REST API and a remote MCP server; Starter and Pro add a PostgreSQL connection string. Plans are Free at $0/mo, Starter at $9/mo, Pro at $49/mo and Enterprise through sales.
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HeliosDB Cloud accounts are for business email addresses. Personal mailbox domains such as gmail.com, yahoo.com and outlook.com are not accepted. After you verify your email address, the account is on the Free plan; a product feedback session with the HeliosDB team raises the Free quotas to their highest level. Agents and scripts that need a database without the console use the BaaS API.
HeliosDB Cloud costs $0/mo on the Free plan, $9/mo on Starter and $49/mo on Pro, with an Enterprise plan through sales. Starter and Pro have no trial period; the Free plan is the way to try the service. The numbers match the pricing page, which also lists the monthly add-ons.
| Feature | Free $0/mo | Starter $9/mo | Pro $49/mo | Enterprise Contact sales |
|---|---|---|---|---|
| Databases | 3 / 4 | 5 | 20 | Custom |
| Storage | 500 MB / 1 GB | 1 GB | 10 GB | Custom |
| Connections | 5 / 10 | 20 | 100 | Custom |
| Vector Storage | 50K / 100K | 100K | 1M | Custom |
| API Requests/mo | 50K / 100K | 100K | 1M | Custom |
| Time-Travel Retention | 7 / 14 days | 30 days | 90 days | Custom |
| Encryption | AES-256-GCM encryption at rest + zero-knowledge encryption | AES-256-GCM encryption at rest, all encryption modes | AES-256-GCM encryption at rest, all encryption modes | AES-256-GCM encryption at rest, all encryption modes |
| SLA | — | 99.5% | 99.9% | 99.99% |
| Support | Community | Priority | Dedicated |
Free column: after email verification / after a product feedback session.
Every plan, Free included, has branching, time-travel queries, managed backups, encryption at rest, zero-knowledge encryption, vector and full-text search, and the REST and MCP interfaces. Plans differ in quotas, retention, connection options, SLA and support.
Create a branch from the current state, from a timestamp or from a transaction ID, switch to it and merge it back. Branches are available in SQL, over REST and as MCP tools.
Read a database as it was at a past timestamp, within the plan's retention window, with AS OF TIMESTAMP in SQL or the query-at endpoint.
Backups are part of the managed service; there is no backup job to set up on your side.
Data is stored with AES-256-GCM encryption at rest. Zero-knowledge encryption derives keys and encrypts data on the client, so the server never sees plaintext keys. Starter and up include all encryption modes.
A REST API described by an OpenAPI 3.1 spec and a remote MCP server at /api/v1/mcp, both authenticated with per-database API keys that carry read or write scopes.
VECTOR(n) columns with HNSW indexes and BM25-ranked full-text search, in the same SQL as the rest of your data.
The connection options depend on the plan. GET /api/v1/connection-info returns the details for your account’s plan, and API keys are created per database in the console or over REST.
REST and MCP over HTTPS with a per-database API key. The Free plan has no PostgreSQL connection string.
REST and MCP, plus a PostgreSQL connection string for psql and standard PostgreSQL drivers. Pro gives each organization a dedicated database file.
A dedicated instance reachable over a private network, with replication status and replication slots over REST and MCP. Auto-scaling, point-in-time restore and multi-region replication are arranged through sales.
curl -X POST "https://cloud.heliosdb.com/api/v1/organizations/$ORG_ID/databases/$DB_ID/execute" \
-H "X-API-Key: $HDB_API_KEY" \
-H "Content-Type: application/json" \
-d '{"sql": "SELECT id, title FROM documents WHERE id = $1", "params": [42]}'curl -X POST "https://cloud.heliosdb.com/api/v1/organizations/$ORG_ID/databases/$DB_ID/branches" \
-H "X-API-Key: $HDB_API_KEY" \
-H "Content-Type: application/json" \
-d '{"name": "before-import", "as_of": "timestamp:2026-10-01T06:00:00"}'claude mcp add --transport http heliosdb https://cloud.heliosdb.com/api/v1/mcp \
--header "Authorization: Bearer $HDB_API_KEY"Use "as_of": "transaction:<id>" to branch from a transaction instead of a timestamp. The full endpoint list and the MCP tool catalogue are on the BaaS page and in the agent integration guide.
HeliosDB Cloud is the managed service for HeliosDB Nano at cloud.heliosdb.com. You create databases in the console or through the API and use them over a REST API, a remote MCP server and, on Starter and above, a PostgreSQL connection string. HeliosDB operates the service, including encryption at rest and backups.
Cloud accounts are for business email addresses. Personal mailbox domains such as gmail.com, yahoo.com and outlook.com are not accepted. Agents and scripts that need a database without the console create one through the BaaS API with POST /api/v1/quick-start, described on the BaaS page.
After you verify your email address, the Free plan gives 3 databases, 500 MB of storage, 5 connections, 50K vectors, 50K API requests a month and 7 days of time-travel retention. Completing a product feedback session raises it to 4 databases, 1 GB, 10 connections, 100K vectors, 100K API requests and 14 days. Free databases are reached over REST and MCP, with AES-256-GCM encryption at rest and zero-knowledge encryption.
No. Starter ($9/mo) and Pro ($49/mo) have no trial period; you subscribe through checkout in the console. To try the service, start on the Free plan and change plan when you need more.
Every plan has the REST API and the MCP server at /api/v1/mcp, authenticated with a per-database API key. Starter and Pro add a PostgreSQL connection string for psql and standard PostgreSQL drivers. Enterprise databases run on a dedicated instance reachable over a private network.
Yes, on every plan. Create a branch from the current state, a timestamp or a transaction ID, switch to it and merge it back, and run time-travel queries at any point inside the plan's retention window: 7 days on Free (14 after the feedback session), 30 days on Starter, 90 days on Pro and a custom window on Enterprise.
Custom limits for databases, storage, connections, vectors, API requests and time-travel retention, a dedicated instance reachable over a private network, replication status and replication slots, a 99.99% SLA and dedicated support. Auto-scaling, point-in-time restore and multi-region replication are arranged through sales; contact sales@heliosdb.com.
HeliosDB Cloud runs HeliosDB Nano databases. A managed service for Lite and Full is planned; both editions are licensed for self-hosting through sales, as described on the pricing page.
Sign up with a business email address, or contact sales for the Enterprise plan.