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

From Omnisend's official docs · checked 10 September 2026

Docs, SDKs and limits

Developer docs

api-docs.omnisend.com/

API reference

api-docs.omnisend.com/reference/overview

Pricing page

www.omnisend.com/pricing/

From our feature matrix — documented by the vendor

API, SMTP and sending auth

• ✓API'flexible APIs'; API keys on all plans with no plan gating
• —SDKs / client librariesnot documented in api-docs.omnisend.com/llms.txt index (Postman collection, JS snippet and MCP server only) — searched 2026-09-10
• ✓Public API docsPublic API reference at api-docs.omnisend.com (versioned REST API, Postman collection)
• ◐WebhooksOutbound webhooks as an automation action; 'Webhooks in Automations are available on paid plans only'
• —SMTP APInot documented in api-docs.omnisend.com/llms.txt index or support.omnisend.com search — searched 2026-09-10
• —SMTP relaynot documented in support.omnisend.com search or api-docs.omnisend.com/llms.txt index (no SMTP pages) — searched 2026-09-10
• ✓Transactional emailTransactional automations, e.g. 'Send automated order confirmation emails with product details, pricing, and shipping info'; 'Automation Workflows can be used on all Omnisend plans'
• ✓SPF assistance'Set Up SPF, DKIM, and DMARC for Email Authentication' support doc
• ✓DKIM setupDKIM setup via sender-domain configuration ('Set Up Your Email Domain in Omnisend')
• ✓DMARC supportDMARC covered in the SPF/DKIM/DMARC authentication setup 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