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Full detail: Where this data comes from
Kit (formerly ConvertKit) is a creator email marketing platform with a REST API for managing subscribers, tags, sequences, forms, broadcasts, and automation rules.
- Website: https://kit.com
- API Docs: https://developers.kit.com
- Status: https://status.kit.com
- Pricing: https://kit.com/pricing
- Changelog: https://developers.kit.com/changelog
- GitHub Org: https://github.com/convertkit
- LinkedIn: https://www.linkedin.com/company/kit.com
- X: https://x.com/kit
The Kit API v4 is a REST API with a base URL of https://api.kit.com/v4. It supports both API key authentication and OAuth 2.0.
- API Key: Pass via
X-Kit-Api-Keyheader. Rate limit: 120 requests per 60-second rolling window. - OAuth 2.0: Authorization Code Grant (with PKCE for SPAs/mobile). Rate limit: 600 requests per 60-second rolling window.
- Subscribers
- Tags
- Sequences
- Forms
- Broadcasts
- Automation rules
- Custom fields
- Purchases (e-commerce, OAuth only)
See plans/convertkit-plans-pricing.yml for full pricing details.
| Plan | Monthly Price | Subscribers |
|---|---|---|
| Newsletter | Free | Up to 10,000 |
| Creator | From $39/mo | From 1,000 (scales) |
| Pro | From $79/mo | From 1,000 (scales) |
All plans include API access.