--- title: "Connect Klenty to Lettr - APIANT.ai" description: "When \"On Bounce\" fires in Klenty, your agent runs \"Add contact\" in Lettr. Describe the whole flow and it is built, tested on every scenario and kept running." canonical: "https://apiant.ai/connect/klenty-to-lettr" --- # Connect Klenty to Lettr When **On Bounce** fires in [Klenty](https://apiant.ai/connections/klenty), your agent runs **Add contact** in [Lettr](https://apiant.ai/connections/lettr). Describe the whole flow and it is built, tested on every scenario and kept running. Klenty **3** triggers Klenty **9** actions Lettr **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 Klenty and Lettr to do together? 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) Example flows ## What Klenty can start in Lettr - When **On Bounce** in Klenty then **Add contact** in Lettr - When **On Start Cadence** in Klenty then **Add contact to list** in Lettr Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with Klenty and Lettr ## Triggers and actions 3 triggers · 20 actions - Trigger **On Bounce** Triggers when a mail bounces. - Trigger **On Start Cadence** Triggers when a cadence is started in Klenty. - Trigger **On Unsubscribe** Triggers when a prospect unsubscribes. - Action **Add Prospect** Creates a Prospect in Klenty. - Action **Get Prospect** Get prospect details by email; also status by email/ID. - Action **List Cadences** Lists all cadences in the connected user's Klenty team (id and name). - Action **List Lists** List prospect lists. - Action **Revert Prospect Status From Do Not Contact** This will allow you to email the prospects again. - Action **Stop All Mails to Prospect** Stops all emails that are scheduled for the Prospect in Klenty. - Action **Unsubscribe Prospect** Unsubscribe prospect from mails. - Action **Update Prospect** Updates an existing prospect in Klenty. - Action **Update Prospect by Email** Updates an existing prospect in Klenty by email. - 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. ## Each app on its own - [ **Klenty** Klenty is a sales engagement and lead generation tool that helps you send personalized emails and automated...](https://apiant.ai/connections/klenty) - [ **Lettr** Lettr is a email API for artisans, send transactional emails using HTML or stored templates.](https://apiant.ai/connections/lettr) Reviews ## What our customers say ## More from Klenty - [ **Klenty to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/klenty-to-salesforce) - [ **Klenty to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/klenty-to-slack) - [ **Klenty to Mailchimp** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/klenty-to-mailchimp) - [ **Klenty to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/klenty-to-stripe) - [ **Klenty to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/klenty-to-shopify) - [ **Klenty to QuickBooks Online** QuickBooks Online accounting — manage customers, invoices, bills, payments, vendors, expenses, and more via...](https://apiant.ai/connect/klenty-to-quickbooks-online) ## More into Lettr - [ **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) Questions ## Klenty and Lettr, answered ### ### What can start an automation from Klenty? Any of Klenty's 3 triggers in the catalog, including On Bounce, On Start Cadence and On Unsubscribe. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Lettr when something happens in Klenty? 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 it also run from Lettr to Klenty? Lettr has no triggers in the catalog today, so automations start in Klenty. If you need the other direction, ask: your agent reads Lettr's API documentation and adds it. ### ### Do I have to build a connector for Klenty or Lettr? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use Klenty and Lettr without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app 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. One connection covers both. ### ### 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.