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Kit (ConvertKit) API v4

Email Free key (no card)

AuthenticationFree key (no card)
Rate limitFree; 120 requests per rolling 60 seconds with an API key (600 with OAuth).

Documentation: developers.kit.com ยท Checked Sep 13, 2026

About

Kit (formerly ConvertKit) is the email platform built for creators, and its v4 API is clean and modern. You can manage subscribers, tags, forms, and sequences with an API key or OAuth. The free Newsletter plan supports a large subscriber list with API access, so it is a strong free option for creator newsletters and lead magnets.

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: Free; 120 requests per rolling 60 seconds with an API key (600 with OAuth).

Verified: 2026-09-13

Best for: email marketing newsletters creators

Read the docs Back to catalog

Setup

  1. Create a free Kit account
  2. Generate an API key (or set up OAuth for multi-user apps)
  3. Test by listing your subscribers
  4. Use tags and forms to organize new signups
  5. Check the docs for which actions your plan supports before automating sends
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