# Tech Blog

> The open reference layer for frontier tech. Companies, investors and funding
> rounds, with explicit provenance for each recorded fact. Released under
> CC-BY-4.0.
> Attribution requested: cite the entity URL.

Currently recorded: 9,719 companies, 27 investors, 9,719 funding rounds.
Facet pages: 40 industries, 19 countries, 4 stages, 235 technologies.

## Machine-readable endpoints

- [Companies API](https://whoraisedwhat.com/api/companies?page=1): paginated JSON, 100 companies per page, with `total` and `next` in each response.
- [One company](https://whoraisedwhat.com/api/companies/{slug}): a single company with its rounds and sources.
- [All investors](https://whoraisedwhat.com/api/investors): full JSON array, one object per investor.
- [Changes API](https://whoraisedwhat.com/api/changes?page=1): one object per changed published fact, 100 per page. Add `date=YYYY-MM-DD` for one day.
- [Changes feed](https://whoraisedwhat.com/changes/feed.xml): Atom, one entry per day with changes.
- [Changes CSV](https://whoraisedwhat.com/changes/ledger.csv): append-only source ledger.
- [Sitemap](https://whoraisedwhat.com/sitemap.xml): every entity URL.

## Provenance

- `sourced`: 4,516 facts across 3,008 companies. Each links a document that states the fact. By type: 2,515 existence, 1,501 description, 500 round.
- `attributed`: 9,219 facts, a publisher is named, with no document URL on file.
- `self-reported`: 15,422 facts, read from the company's own site.

Each source and funding round carries a `status` and nullable `url`, so clients
can filter on provenance without parsing prose.
A funding round's type is null when no type was recorded. Pages call it Funding round.

## Pages

- [Companies](https://whoraisedwhat.com/c/page/1)
- [Changes](https://whoraisedwhat.com/changes)
- [Industries](https://whoraisedwhat.com/i)
- [Countries](https://whoraisedwhat.com/c-by)
- [Stages](https://whoraisedwhat.com/stage)
- [Technologies](https://whoraisedwhat.com/tech)
- [Investors](https://whoraisedwhat.com/investor)
- [Dataset statistics](https://whoraisedwhat.com/stats)

## Terms

Crawling is welcome and unmetered. No rate limit, no login, no paywall.
Facts carry a `retrievedAt` date and one of the provenance states above. Where
a real document URL exists, prefer that document over us and report conflicts.