The data behind newsletters, creators, and the platforms they live on — pulled, normalized, and delivered as developer-friendly JSON. No scraping headaches. No broken wrappers.
We build focused, reliable data APIs one at a time — and we ship in the open.
Pull any public Substack publication's full post archive plus benchmark analytics — paid/free ratio, posting cadence, reactions, comments — in a single call. Public, read-only data only.
# one call, clean JSON GET /v1/publication?url=lennysnewsletter.com&limit=25 → { "paid_ratio": 0.8, "posts_per_week_est": 0.9, "avg_reactions_per_post": 395, "posts": [ … ] }Get your free API key
We ran our own Substack API across six of the top newsletters. Every number below came straight from the endpoint — this is the kind of competitive intelligence you'd otherwise have to build from scratch.
| Newsletter | Paid % | Posts / wk | Avg reactions | Comments (30 posts) |
|---|---|---|---|---|
| Astral Codex Ten | 17% | 3.8 | 217 | 12,972 |
| Lenny's Newsletter | 80% | 0.9 | 395 | 510 |
| The Pragmatic Engineer | 60% | 2.7 | 191 | 144 |
| Gary Marcus | 3% | 6.2 | 255 | 3,240 |
| Noahpinion | 27% | 3.8 | 480 | 2,739 |
| Slow Boring | 77% | 15.0 | 128 | 8,223 |
CreatorData is a growing suite. Each product is a clean API for a corner of the creator economy that's painful to get data out of.
No team, no funding, no fluff — just real products shipped fast, with the real numbers shown along the way (the wins and the flops). If you want to watch a company get built from zero with an AI doing the heavy lifting, follow along.
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