--- title: "Lettr integrations and MCP server - APIANT.ai" description: "Connect Lettr to any other app, or use it from your AI client over MCP. Lettr is a email API for artisans, send transactional emails using HTML or stored..." canonical: "https://apiant.ai/connections/lettr" --- # Lettr integrations Connect Lettr to any other app, or use it from your AI client over MCP. Lettr is a email API for artisans, send transactional emails using HTML or stored templates. Track engagement and deliverability. Connects with an API key [lettr.com](https://lettr.com/) **11** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want to automate with Lettr? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Popular ## Lettr with the apps people pair it with most - [ **HubSpot to Lettr** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-lettr) - [ **Salesforce to Lettr** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-lettr) - [ **Slack to Lettr** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-lettr) - [ **Google Sheets to Lettr** Google Sheets](https://apiant.ai/connect/google-sheets-to-lettr) - [ **Gmail to Lettr** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-lettr) - [ **Google Calendar to Lettr** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-lettr) - [ **Google Drive to Lettr** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-lettr) - [ **Mailchimp to Lettr** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-lettr) Pair it ## Connect Lettr with another app - [ **HubSpot to Lettr**](https://apiant.ai/connect/hubspot-to-lettr) - [ **Salesforce to Lettr**](https://apiant.ai/connect/salesforce-to-lettr) - [ **Slack to Lettr**](https://apiant.ai/connect/slack-to-lettr) - [ **Google Sheets to Lettr**](https://apiant.ai/connect/google-sheets-to-lettr) - [ **Gmail to Lettr**](https://apiant.ai/connect/gmail-to-lettr) - [ **Google Calendar to Lettr**](https://apiant.ai/connect/google-calendar-to-lettr) - [ **Google Drive to Lettr**](https://apiant.ai/connect/google-drive-to-lettr) - [ **Mailchimp to Lettr**](https://apiant.ai/connect/mailchimp-to-lettr) - [ **Stripe to Lettr**](https://apiant.ai/connect/stripe-to-lettr) - [ **Shopify to Lettr**](https://apiant.ai/connect/shopify-to-lettr) - [ **QuickBooks Online to Lettr**](https://apiant.ai/connect/quickbooks-online-to-lettr) - [ **Pipedrive to Lettr**](https://apiant.ai/connect/pipedrive-to-lettr) - [ **ActiveCampaign to Lettr**](https://apiant.ai/connect/activecampaign-to-lettr) - [ **Notion to Lettr**](https://apiant.ai/connect/notion-to-lettr) - [ **Airtable to Lettr**](https://apiant.ai/connect/airtable-to-lettr) - [ **Trello to Lettr**](https://apiant.ai/connect/trello-to-lettr) - [ **Asana to Lettr**](https://apiant.ai/connect/asana-to-lettr) - [ **JIRA to Lettr**](https://apiant.ai/connect/jira-to-lettr) - [ **ClickUp to Lettr**](https://apiant.ai/connect/clickup-to-lettr) - [ **Zoom to Lettr**](https://apiant.ai/connect/zoom-to-lettr) - [ **Discord to Lettr**](https://apiant.ai/connect/discord-to-lettr) - [ **Twilio to Lettr**](https://apiant.ai/connect/twilio-to-lettr) - [ **SendGrid to Lettr**](https://apiant.ai/connect/sendgrid-to-lettr) - [ **Outlook to Lettr**](https://apiant.ai/connect/outlook-to-lettr) - [ **Intercom to Lettr**](https://apiant.ai/connect/intercom-to-lettr) - [ **Freshdesk to Lettr**](https://apiant.ai/connect/freshdesk-to-lettr) - [ **Klaviyo to Lettr**](https://apiant.ai/connect/klaviyo-to-lettr) - [ **Brevo to Lettr**](https://apiant.ai/connect/brevo-to-lettr) - [ **Typeform to Lettr**](https://apiant.ai/connect/typeform-to-lettr) - [ **JotForm to Lettr**](https://apiant.ai/connect/jotform-to-lettr) - [ **Calendly to Lettr**](https://apiant.ai/connect/calendly-to-lettr) - [ **PandaDoc to Lettr**](https://apiant.ai/connect/pandadoc-to-lettr) - [ **Webflow to Lettr**](https://apiant.ai/connect/webflow-to-lettr) - [ **Wix to Lettr**](https://apiant.ai/connect/wix-to-lettr) - [ **Instagram to Lettr**](https://apiant.ai/connect/instagram-to-lettr) - [ **OpenAI to Lettr**](https://apiant.ai/connect/openai-to-lettr) - [ **OneDrive to Lettr**](https://apiant.ai/connect/onedrive-to-lettr) - [ **Google Docs to Lettr**](https://apiant.ai/connect/google-docs-to-lettr) - [ **Ontraport to Lettr**](https://apiant.ai/connect/ontraport-to-lettr) - [ **Freshworks CRM to Lettr**](https://apiant.ai/connect/freshworks-crm-to-lettr) - [ **GoHighLevel to Lettr**](https://apiant.ai/connect/gohighlevel-to-lettr) - [ **Capsule CRM to Lettr**](https://apiant.ai/connect/capsule-crm-to-lettr) - [ **Copper to Lettr**](https://apiant.ai/connect/copper-to-lettr) - [ **Streak to Lettr**](https://apiant.ai/connect/streak-to-lettr) - [ **NetHunt CRM to Lettr**](https://apiant.ai/connect/nethunt-crm-to-lettr) - [ **MINDBODY to Lettr**](https://apiant.ai/connect/mindbody-to-lettr) - [ **PostgreSQL to Lettr**](https://apiant.ai/connect/postgresql-to-lettr) - [ **MySQL to Lettr**](https://apiant.ai/connect/mysql-to-lettr) - [ **Vercel to Lettr**](https://apiant.ai/connect/vercel-to-lettr) - [ **PagerDuty to Lettr**](https://apiant.ai/connect/pagerduty-to-lettr) - [ **Gravity Forms to Lettr**](https://apiant.ai/connect/gravity-forms-to-lettr) - [ **HubSpot Enterprise to Lettr**](https://apiant.ai/connect/hubspot-enterprise-to-lettr) - [ **Google Forms to Lettr**](https://apiant.ai/connect/google-forms-to-lettr) - [ **monday.com to Lettr**](https://apiant.ai/connect/monday-com-to-lettr) - [ **Google Ads to Lettr**](https://apiant.ai/connect/google-ads-to-lettr) - [ **Google Tasks to Lettr**](https://apiant.ai/connect/google-tasks-to-lettr) - [ **Telegram to Lettr**](https://apiant.ai/connect/telegram-to-lettr) - [ **MailerLite to Lettr**](https://apiant.ai/connect/mailerlite-to-lettr) - [ **Google Contacts to Lettr**](https://apiant.ai/connect/google-contacts-to-lettr) - [ **Kit to Lettr**](https://apiant.ai/connect/kit-to-lettr) What your agent can do with Lettr ## Triggers and actions 11 actions - Action **Add audience list** Creates a new audience list in Lettr with the given name and returns the created list. - Action **Add contact** Adds a new contact to your Lettr audience, optionally placing it on a list, setting custom properties, and sending a double opt-in confirmation email. - Action **Add contact to list** Adds an existing contact to one of your audience lists. Succeeds whether the contact was newly added or was already on the list. - Action **Add template** Creates a new email template in Lettr from HTML or Topol editor JSON content, and publishes its first version with the merge tags found in the content. - Action **Delete contact** Permanently deletes a contact from your Lettr audience. - Action **Get contact** Returns a single audience contact, including its subscription status, custom properties, lists and topics. - Action **Get template** Returns a single email template by its slug, including its HTML, editor content, purpose, status and version details. - Action **List audience lists** Returns all audience lists in your Lettr team, with each list's name and contact count. - Action **List contacts** Returns the contacts in your Lettr audience, optionally narrowed by a search term, subscription status, list or segment. - Action **List templates** Returns the email templates in a Lettr project, optionally limited to one folder or to transactional or campaign templates. - Action **Update contact** Updates an existing contact in your Lettr audience, changing its email address, subscription status or custom properties. Fields left blank are not changed. Reviews ## What our customers say Questions ## Lettr, answered ### ### Is there a Lettr MCP server? APIANT's MCP server at https://mcp.apiant.ai works with Lettr. Add that address to any AI client that takes a remote MCP server and sign in once in your browser. Your client can then run Lettr actions on demand, or have APIANT build, test and run automations that use Lettr. Nothing to install. ### ### What can your agent do in Lettr? Any of Lettr's 11 actions, including Update contact, Add audience list, Add contact and Add contact to list. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can I use Lettr directly from Claude, ChatGPT or Cursor? Yes. Connect your AI client to APIANT once and it works with Lettr two ways. Ask it to do something in Lettr once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running on its own. A one-off action uses your plan's tasks the same way an automation step does. ### ### Do I need to write code against the Lettr API? No. APIANT connects to the Lettr API for you, with your Lettr API key. Describe what you want in plain language and your agent builds it on the Lettr triggers and actions in the catalog. If you need an endpoint that is not there yet, your agent reads the Lettr API documentation and adds it. ### ### Which apps can Lettr connect to? Any app in the catalog; the list on this page pairs Lettr with each of them. If the other app is missing, point your agent at its API documentation and it builds the connector. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.