--- title: "Connect Klaviyo and PostStack - APIANT.ai" description: "When \"New Event\" fires in Klaviyo, your agent runs \"Add a contact\" in PostStack." canonical: "https://apiant.ai/connect/klaviyo-to-poststack" --- # Connect Klaviyo and PostStack When **New Event** fires in [Klaviyo](https://apiant.ai/connections/klaviyo), your agent runs **Add a contact** in [PostStack](https://apiant.ai/connections/poststack), or **Contact Updated (instant)** in PostStack to **Add Categories to Catalog Item** in Klaviyo. Describe the whole flow and it is built, tested on every scenario and kept running. Klaviyo **2** triggers Klaviyo **138** actions PostStack **7** triggers PostStack **31** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Klaviyo and PostStack 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 Klaviyo and PostStack can do together ### From Klaviyo to PostStack - When **New Event** in Klaviyo then **Add a contact** in PostStack - When **New or Updated Profile** in Klaviyo then **Add contacts to segment** in PostStack ### From PostStack to Klaviyo - When **Contact Updated (instant)** in PostStack then **Add Categories to Catalog Item** in Klaviyo - When **New Contact (instant)** in PostStack then **Add Items to Catalog Category** in Klaviyo 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 Klaviyo and PostStack ## Triggers and actions 9 triggers · 169 actions - Trigger **New Event** Polling trigger. Fires when a new event (metric occurrence) is recorded, ordered by most-recent datetime. - Trigger **New or Updated Profile** Polling trigger. Fires when a profile is created or updated, ordered by most-recently updated. - Action **Add Categories to Catalog Item** Add Categories to Catalog Item - Action **Add Items to Catalog Category** Add Items to Catalog Category - Action **Add Profiles to List** Add Profiles to List - Action **Add Profile to List** Add an existing profile to a list by profile ID. - Action **Bulk Create Catalog Categories** Bulk Create Catalog Categories - Action **Bulk Create Catalog Items** Bulk Create Catalog Items - Action **Bulk Create Catalog Variants** Bulk Create Catalog Variants - Action **Bulk Create Coupon Codes** Bulk Create Coupon Codes - Action **Bulk Create Events** Bulk Create Events - Action **Bulk Delete Catalog Categories** Bulk Delete Catalog Categories - Action **Bulk Delete Catalog Items** Bulk Delete Catalog Items - Action **Bulk Delete Catalog Variants** Bulk Delete Catalog Variants - Action **Bulk Import Profiles** Bulk Import Profiles - Action **Bulk Subscribe Profiles** Bulk Subscribe Profiles - Action **Bulk Suppress Profiles** Bulk Suppress Profiles - Action **Bulk Unsubscribe Profiles** Bulk Unsubscribe Profiles - Action **Bulk Unsuppress Profiles** Bulk Unsuppress Profiles - Action **Bulk Update Catalog Categories** Bulk Update Catalog Categories - Action **Bulk Update Catalog Items** Bulk Update Catalog Items - Action **Bulk Update Catalog Variants** Bulk Update Catalog Variants - Action **Cancel Campaign Send** Cancel Campaign Send - Action **Clone Campaign** Clone Campaign - Action **Clone Template** Clone Template - Action **Create Back In Stock Subscription** Create Back In Stock Subscription - Action **Create Campaign** Create Campaign - Action **Create Campaign Clone** Create Campaign Clone - Action **Create Catalog Category** Create Catalog Category - Action **Create Catalog Item** Create Catalog Item - Action **Create Catalog Variant** Create Catalog Variant - Action **Create Coupon** Create Coupon - Action **Create Coupon Code** Create Coupon Code - Action **Create Event** Track an event for a profile (e.g. a custom metric like "Placed Order"). - Action **Create Flow** Create Flow - Action **Create List** Create a new list. - Action **Create or Update Profile** Create a profile if it doesn't exist, otherwise update the matching profile (upsert by email/phone/id). - Action **Create Profile** Create a new profile. Errors if a profile with the email already exists. - Action **Create Segment** Create Segment - Action **Create Tag** Create Tag - Action **Create Template** Create Template - Action **Delete Campaign** Delete Campaign - Action **Delete Catalog Category** Delete Catalog Category - Action **Delete Catalog Item** Delete Catalog Item - Action **Delete Catalog Variant** Delete Catalog Variant - Action **Delete Coupon** Delete Coupon - Action **Delete Coupon Code** Delete Coupon Code - Action **Delete Flow** Delete Flow - Action **Delete List** Delete List - Action **Delete Segment** Delete Segment - Action **Delete Tag** Delete Tag - Action **Delete Template** Delete Template - Action **Get Campaign** Get Campaign - Action **Get Campaign Recipient Estimation** Get Campaign Recipient Estimation - Action **Get Campaigns** Get Campaigns - Action **Get Catalog Categories** Get Catalog Categories - Action **Get Catalog Category** Get Catalog Category - Action **Get Catalog Item** Get Catalog Item - Action **Get Catalog Items** Get Catalog Items - Action **Get Catalog Variant** Get Catalog Variant - Action **Get Catalog Variants** Get Catalog Variants - Action **Get Coupon** Get Coupon - Action **Get Coupon Code** Get Coupon Code - Action **Get Coupon Codes** Get Coupon Codes - Action **Get Coupons** Get Coupons - Action **Get Event** Get Event - Action **Get Events** Retrieve events, optionally filtered (e.g. by metric or profile). - Action **Get Flow** Get Flow - Action **Get Flows** Get Flows - Action **Get Flows Triggered by List** Get Flows Triggered by List - Action **Get Flows Triggered by Metric** Get Flows Triggered by Metric - Action **Get Flows Triggered by Segment** Get Flows Triggered by Segment - Action **Get Form** Get Form - Action **Get Forms** Get Forms - Action **Get Form Version** Get Form Version - Action **Get Image** Get Image - Action **Get Images** Get Images - Action **Get List** Get List - Action **Get List Profiles** Get all profiles that are members of a given list. - Action **Get Lists** Retrieve all lists in the account. - Action **Get Metric** Get Metric - Action **Get Metrics** Retrieve all metrics in the account. - Action **Get Profile** Get Profile - Action **Get Profile by Email** Fetch a single profile by its email address. Emits empty values if no profile is found. - Action **Get Profile by ID** Fetch a single profile by its Klaviyo profile ID. - Action **Get Profiles** List profiles, optionally filtered by email or other attributes. - Action **Get Push Tokens** Get Push Tokens - Action **Get Reviews** Get Reviews - Action **Get Segment** Get Segment - Action **Get Segment Profiles** Get all profiles in a given segment. - Action **Get Segments** Retrieve all segments in the account. - Action **Get Tag** Get Tag - Action **Get Tags** Get Tags - Action **Get Template** Get Template - Action **Get Templates** Get Templates - Action **Merge Profiles** Merge Profiles - Action **Query Campaign Values** Query Campaign Values - Action **Query Flow Series** Query Flow Series - Action **Query Flow Values** Query Flow Values - Action **Query Form Series** Query Form Series - Action **Query Form Values** Query Form Values - Action **Query Metric Aggregates** Query Metric Aggregates - Action **Query Segment Series** Query Segment Series - Action **Query Segment Values** Query Segment Values - Action **Refresh Campaign Recipient Estimation** Refresh Campaign Recipient Estimation - Action **Remove Categories from Catalog Item** Remove Categories from Catalog Item - Action **Remove Items from Catalog Category** Remove Items from Catalog Category - Action **Remove Profile from List** Remove a profile from a list by profile ID. - Action **Remove Profiles from List** Remove Profiles from List - Action **Remove Tag from Campaigns** Remove Tag from Campaigns - Action **Remove Tag from Flows** Remove Tag from Flows - Action **Remove Tag from Lists** Remove Tag from Lists - Action **Remove Tag from Segments** Remove Tag from Segments - Action **Render Template** Render Template - Action **Request Profile Deletion** Request Profile Deletion - Action **Send Campaign** Send Campaign - Action **Subscribe Profile** Subscribe a profile (email/SMS consent) to a given list. - Action **Suppress Profile** Suppress a profile from receiving email marketing (global suppression). - Action **Tag Campaigns** Tag Campaigns - Action **Tag Flows** Tag Flows - Action **Tag Lists** Tag Lists - Action **Tag Segments** Tag Segments - Action **Unsubscribe Profile** Unsubscribe a profile from email/SMS marketing for a given list. - Action **Update Campaign** Update Campaign - Action **Update Catalog Category** Update Catalog Category - Action **Update Catalog Item** Update Catalog Item - Action **Update Catalog Variant** Update Catalog Variant - Action **Update Categories for Catalog Item** Update Categories for Catalog Item - Action **Update Coupon** Update Coupon - Action **Update Coupon Code** Update Coupon Code - Action **Update Flow Status** Update Flow Status - Action **Update Image** Update a Klaviyo image. Reads the image first, overlays only the values you supply, then saves the merged result — so anything you leave blank keeps its current value. - Action **Update Items for Catalog Category** Update Items for Catalog Category - Action **Update List** Update List - Action **Update Profile** Update an existing profile by its Klaviyo profile ID. - Action **Update Segment** Update Segment - Action **Update Tag** Update Tag - Action **Update Template** Update Template - Action **Upload Image From File** Upload Image From File - Action **Upload Image From URL** Upload Image From URL - Trigger **Contact Deleted (instant)** Fires when a contact is deleted (event: contact.deleted). - Trigger **Contact Updated (instant)** Fires when a contact is updated (event: contact.updated). - Trigger **Email Bounced (instant)** Fires when an email bounces (event: email.bounced). - Trigger **Email Delivered (instant)** Fires when an email is delivered (event: email.delivered). - Trigger **New Contact (instant)** Fires when a contact is created (event: contact.created). - Trigger **New Inbound Email** Polls for newly received inbound emails. - Trigger **New Sent Email (instant)** Fires when an email is sent (event: email.sent). - Action **Add a broadcast** Create a new marketing broadcast. - Action **Add a contact** Create a new contact. - Action **Add a segment** Create a new manual contact segment. - Action **Add a template** Create a new email template. - Action **Add contacts to segment** Add contacts to an existing segment. - Action **Add suppression** Add an address to the suppression list. - Action **Cancel broadcast** Cancel an in-flight broadcast. - Action **Cancel email** Cancel a scheduled or queued email before it sends. - Action **Delete a contact** Delete a contact. - Action **Delete a template** Delete an email template. - Action **Get a contact** Fetch one contact by ID. - Action **Get a template** Fetch one email template by ID. - Action **Get broadcast** Retrieve one broadcast by its public id, including the HTML and text bodies that the list endpoint omits. - Action **Get email** Fetch one sent or queued email by ID. - Action **Get email events** Get the delivery event timeline for one email. - Action **Get inbound email** Fetch one received inbound email by ID. - Action **Import contacts** Bulk-import a CSV list of contacts. - Action **List broadcasts** List marketing broadcasts. - Action **List contacts** List contacts in the account. - Action **List emails** List sent, queued, and scheduled emails. - Action **List inbound emails** List emails received via inbound parsing. - Action **List segments** List contact segments. - Action **List suppressed addresses** List addresses on the suppression list. - Action **List templates** List email templates. - Action **Send an email** Send a transactional email through PostStack. - Action **Send broadcast** Start sending a broadcast to its recipients. - Action **Send emails in batch** Send up to 100 emails in a single request. - Action **Update a contact** Update an existing contact's fields. - Action **Update a template** Update an email template, creating a new version. - Action **Update email** Reschedule a queued email's send time. - Action **Validate email address** Check whether an email address is valid and deliverable. ## Each app on its own - [ **Klaviyo** Klaviyo is a marketing automation platform for email and SMS.](https://apiant.ai/connections/klaviyo) - [ **PostStack** EU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analytics](https://apiant.ai/connections/poststack) Reviews ## What our customers say ## More from Klaviyo - [ **Klaviyo to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/klaviyo-to-salesforce) - [ **Klaviyo to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/klaviyo-to-slack) - [ **Klaviyo to Mailchimp** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/klaviyo-to-mailchimp) - [ **Klaviyo to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/klaviyo-to-shopify) - [ **Klaviyo to QuickBooks Online** QuickBooks Online accounting — manage customers, invoices, bills, payments, vendors, expenses, and more via...](https://apiant.ai/connect/klaviyo-to-quickbooks-online) - [ **Klaviyo to Pipedrive** Pipedrive is a sales CRM and pipeline management tool.](https://apiant.ai/connect/klaviyo-to-pipedrive) ## More into PostStack - [ **HubSpot to PostStack** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-poststack) - [ **Google Sheets to PostStack** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-poststack) - [ **Gmail to PostStack** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-poststack) - [ **Google Calendar to PostStack** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-poststack) - [ **Google Drive to PostStack** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-poststack) - [ **Mailchimp to PostStack** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-poststack) Questions ## Klaviyo and PostStack, answered ### ### What can start an automation from Klaviyo? Any of Klaviyo's 2 triggers in the catalog, including New Event and New or Updated Profile. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in PostStack when something happens in Klaviyo? Any of PostStack's 31 actions, including Send an email, Send broadcast, Send emails in batch and Update a contact. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from PostStack to Klaviyo? Yes. When something happens in PostStack, your agent can act in Klaviyo too. This page covers both directions: PostStack's triggers and Klaviyo's actions are listed here as well. ### ### Do I have to build a connector for Klaviyo or PostStack? 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 Klaviyo and PostStack 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.