Kit email API: SDKs, docs and limits (2026)

From Kit's official docs · checked 10 September 2026

Docs, SDKs and limits

Developer docs

developers.kit.com/

API reference

developers.kit.com/api-reference/overview

Webhooks

Webhook docs

Pricing page

kit.com/pricing

From our feature matrix — documented by the vendor

API, SMTP and sending auth

• ✓APIKit V4 API for building apps; API overview help article
• —SDKs / client librariesnot documented in developers.kit.com/api-reference/overview or developers.kit.com llms.txt (OpenAPI v4 spec published; no SDK pages) — searched 2026-09-10
• ✓Public API docsPublic developer documentation portal
• ✓WebhooksWebhook action node in automations sends subscriber data to a destination URL
• —SMTP APInot documented in developers.kit.com llms.txt (REST v4 OpenAPI, webhooks, MCP only) or help.kit.com — searched 2026-09-10
• —SMTP relaynot documented in help.kit.com or developers.kit.com llms.txt (REST v4 OpenAPI, webhooks, MCP only) — searched 2026-09-10
• —Transactional emailnot documented in help.kit.com (Send, Deliverability collections, Acceptable Use Policy) or developers.kit.com llms.txt — searched 2026-09-10
• ✓SPF assistance'Kit authenticates DKIM and SPF for you' via Verified Sending Domain setup
• ✓DKIM setupDKIM authenticated by Kit through verified sending domain
• ✓DMARC support'How to add a DMARC record to your verified sending domain' step-by-step doc

Features checked 10 September 2026. ✓ documented · ◐ limited or plan-gated · × documented as absent · — not documented. Documentation is not a measured result — see our methodology.

Pricing snapshot

Generated from our datasets — every value verified and dated

Frequently asked questions