API

Read-only JSON, no API key required, no signup. CORS is open for GET requests.

Endpoints

• GET /api/v1/newsletters/{slug} — sponsor placements for one newsletter.
• GET /api/v1/sponsors/{domain} — newsletters one sponsor advertises in.
• GET /api/v1/new-this-week — sponsors first seen this week. Pass ?week=YYYY-MM-DD (any Monday) for a past week.

Example

curl https://whosponsorsit.com/api/v1/newsletters/tldr

Rate limit

120 requests per 60 seconds, per IP address. Exceeding it returns HTTP 429.

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