--- title: "Connect Omnisend to Hypamoon" description: "Omnisend has an open API. See what you can build with it in Hypamoon, how it signs in, and the sources we checked." url: https://hypamoon.com/connect-to/omnisend --- 1. [Connect to](https://hypamoon.com/connect-to) 2. Omnisend Email marketing # Connect Omnisend to Hypamoon Yes. Omnisend has a public, versioned API and you create the key yourself, so your chat can write the adapter. Open ## The check Three questions about the API of Omnisend, answered from its own docs. **Public API docs**\ **Yes.** [Read the docs](https://api-docs.omnisend.com/reference/authentication) **A key you create yourself**\ **Yes.** Create an API key yourself in the API keys section of your Omnisend account. [api-docs.omnisend.com](https://api-docs.omnisend.com/reference/authentication) **Versions or a changelog**\ **Yes.** Date based versions in an Omnisend-Version header, with migration guides from older versions. [api-docs.omnisend.com](https://api-docs.omnisend.com/docs/migrate-from-v5-to-v2026-03-15) **How it signs in**\ An API key in the Authorization header with the prefix Omnisend-API-Key, plus an Omnisend-Version header; OAuth 2.0 for apps. **Webhooks**\ **Not confirmed.** **Hosting**\ Cloud ## What you can build Add contacts with consent from a site or chat, send custom events that start an automation, and look up a contact's details. Your chat writes it as a Hypamoon adapter from the docs above. Reading starts after you click Allow in the portal, and every write waits for your approval, one call at a time. [How adapters work](https://hypamoon.com/docs/adapters) ### Good to know - Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow. - Automation workflows can send a webhook to your own URL as a step. ## Try it in your chat Fill in what to read and write, and send it. Say this in your chat > Build the Hypamoon recipe build-an-adapter for Omnisend. API docs: https://api-docs.omnisend.com/reference. Read: \[what\]. Write: \[what, or nothing\]. [Open in Claude](https://claude.ai/new?q=Build%20the%20Hypamoon%20recipe%20build-an-adapter%20for%20Omnisend.%20API%20docs%3A%20https%3A%2F%2Fapi-docs.omnisend.com%2Freference.%20Read%3A%20%5Bwhat%5D.%20Write%3A%20%5Bwhat%2C%20or%20nothing%5D.) In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. [The full recipe](https://hypamoon.com/r/build-an-adapter) ## Sources Checked on 1 November 2026. - [api-docs.omnisend.com/reference/authentication](https://api-docs.omnisend.com/reference/authentication) - [api-docs.omnisend.com/docs/migrate-from-v5-to-v2026-03-15](https://api-docs.omnisend.com/docs/migrate-from-v5-to-v2026-03-15) Omnisend is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Omnisend. Found something that changed? Tell us at [support](https://hypamoon.com/support#contact). ## More in email marketing - [**ActiveCampaign** Open](https://hypamoon.com/connect-to/activecampaign) - [**Brevo** Open](https://hypamoon.com/connect-to/brevo) - [**Campaign Monitor** Open](https://hypamoon.com/connect-to/campaign-monitor) - [**Constant Contact** Open](https://hypamoon.com/connect-to/constant-contact) - [**Customer.io** Open](https://hypamoon.com/connect-to/customer-io) - [**Klaviyo** Open](https://hypamoon.com/connect-to/klaviyo) - [**Laposta** Open](https://hypamoon.com/connect-to/laposta) - [**Mailchimp** Open](https://hypamoon.com/connect-to/mailchimp) - [**MailerLite** Open](https://hypamoon.com/connect-to/mailerlite) - [**Marketo Engage** Open](https://hypamoon.com/connect-to/marketo-engage) - [**Salesforce Account Engagement (Pardot)** Open](https://hypamoon.com/connect-to/salesforce-account-engagement) [All 267 tools](https://hypamoon.com/connect-to) ## Tool not listed? Ask the chat to check its API. The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found. Say this in your chat > Check if \[software\] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used. [Open in Claude](https://claude.ai/new?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) [Open in ChatGPT](https://chatgpt.com/?q=Check%20if%20%5Bsoftware%5D%20has%20an%20open%20API%20that%20a%20Hypamoon%20adapter%20can%20use%3A%20public%20API%20docs%2C%20a%20key%20or%20token%20I%20can%20create%20myself%20without%20asking%20the%20vendor%2C%20and%20versions%20or%20a%20changelog.%20Link%20the%20pages%20you%20used.) Fill in the name of your software. Checking needs no connection to Hypamoon. ## Ready to connect Omnisend? Connect your chat once, then ask it to build the adapter. [Start free](https://app.hypamoon.com/?mode=signup&utm_source=connect-to&utm_campaign=omnisend) Works in Claude and ChatGPT. [Add to Claude](https://hypamoon.com/connect?via=connect-to~omnisend#claude) [Add to ChatGPT](https://hypamoon.com/connect?via=connect-to~omnisend#chatgpt)