Kit API

API Paid Caution Email

Pricing

$33/mo

Creator shown at $33/mo for 1,000 subscribers. Free plan exists.

Free tier

Free plan (10,000 subs); API access not confirmed

Auth

API key

API key in the X-Kit-Api-Key header. OAuth (authorization code, PKCE) also supported and needed for bulk endpoints.

Data it gives

Subscribers
Tags
Broadcasts and stats
Webhooks
Account details

Pricing checked on 23 Oct 2026 · Pricing page · Docs · Sign up

Description

The Kit API (V4) lets you read and write subscribers, tags, broadcasts, forms and webhooks for a Kit account. It uses cursor pagination and supports bulk requests that run asynchronously.

It suits creators and small teams who want an agent to add subscribers, tag them from other tools or pull broadcast stats.

V3 still works but is deprecated and will be sunset, so build on V4.

Key endpoints

GET /v4/account: current account
GET /v4/subscribers: list subscribers
POST /v4/subscribers: create a subscriber
GET /v4/broadcasts: list broadcasts
GET /v4/tags: list tags

Example request

curl --request GET --url https://api.kit.com/v4/account --header "X-Kit-Api-Key: YOUR_API_KEY"

Tech details

API style: REST
Base URL: https://api.kit.com
Rate limits: API key: 120 requests per rolling 60 seconds. OAuth: 600 per 60 seconds. 429 on excess.
Official SDKs: See docs

Use Cases

Subscribers

Broadcasts and stats

Account details

Editor’s note What our review found

Editorial research, reviewed 23 Oct 2026. We read Kit's pricing page and developer docs. We did not run live calls. This listing is not an endorsement.

Cost: Kit has a Free plan for up to 10,000 subscribers, then Creator at $33 a month and Pro at $66 a month (shown for 1,000 subscribers; Pro had a first-year discount to $50). The docs say API access depends on an eligible plan, and the pricing page text did not make the Free column clear. API access on Free is not confirmed.

Credentials and data: use an API key in the X-Kit-Api-Key header, or OAuth. Store keys in an environment variable or secret manager, never in code or a plain-text file. You handle subscriber emails, so GDPR and consent rules apply.

Good to know: API keys are limited to 120 requests per rolling 60 seconds, OAuth to 600. Bulk and some other endpoints need OAuth.