Data / Developers
API and MCP
Use Heimdall Research datasets from code or from an AI assistant: a REST API, an MCP server and open downloads, all with one key.
Access
Ways to use the data
| Method | For | Details |
|---|---|---|
| Downloads | Analysts, researchers and data scientists | CSV and Parquet files on Zenodo (with a DOI) and Hugging Face. No key needed. |
| REST API | Developers | https://api.heimdallresearch.com/v1/, authenticated with Authorization: Bearer <key>. Every response carries the dataset version, DOI and citation. |
| MCP server | AI assistants | https://api.heimdallresearch.com/mcp for Claude, ChatGPT, Cursor and other MCP clients. Same key, same limits as the API. |
Limits
Keys and limits
- Free key
- 10 calls a minute and 100 a day, for every free dataset.
- Paid plans
- 60 calls a minute and 10,000 a day. See plans and prices.
- Licensed data
- The same API and MCP server deliver licensed products, with a key scoped to your organization and product. Limits are set in your license.
- When you hit a limit
- The API answers 429 with a
Retry-Afterheader. Every response reports your remaining calls. - Keys
- Shown once, stored only as a hash, limited to the datasets you choose, and revocable at any time.
Status
Availability
- Opens
- With the first dataset release in October 2026. Sign-up, documentation and the status page go live at the same time.
- Early access
- Researchers and developers who want to test before launch can ask for early access.