--- title: "Connect OnceHub and PostStack - APIANT.ai" description: "When \"Booking Completed\" fires in OnceHub, your agent runs \"Add a contact\" in PostStack." canonical: "https://apiant.ai/connect/oncehub-to-poststack" --- # Connect OnceHub and PostStack When **Booking Completed** fires in [OnceHub](https://apiant.ai/connections/oncehub), your agent runs **Add a contact** in [PostStack](https://apiant.ai/connections/poststack), or **Contact Updated (instant)** in PostStack to **Create Contact** in OnceHub. Describe the whole flow and it is built, tested on every scenario and kept running. OnceHub **15** triggers OnceHub **17** 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 OnceHub 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 OnceHub and PostStack can do together ### From OnceHub to PostStack - When **Booking Completed** in OnceHub then **Add a contact** in PostStack - When **Contact Updated** in OnceHub then **Add contacts to segment** in PostStack ### From PostStack to OnceHub - When **Contact Updated (instant)** in PostStack then **Create Contact** in OnceHub - When **New Contact (instant)** in PostStack then **Update Contact** in OnceHub 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 OnceHub and PostStack ## Triggers and actions 22 triggers · 48 actions - Trigger **Booking Canceled** Triggers when a OnceHub booking is canceled by the customer or by someone on your team. - Trigger **Booking Cancelled and Rescheduled** Triggers when a customer cancels a OnceHub booking and then reschedules it on a different booking page. - Trigger **Booking Completed** Triggers when a OnceHub booking's end time has passed and the meeting is marked completed. - Trigger **Booking Lifecycle Event** Triggers on any OnceHub booking event — scheduled, rescheduled, reassigned, canceled, completed or no-show — with the event name included so you can branch on it. - Trigger **Booking No-Show** Triggers when a OnceHub booking is marked as a no-show. - Trigger **Booking Rescheduled** Triggers when a OnceHub booking is rescheduled to a new time. - Trigger **Booking Scheduled** Triggers when a new OnceHub booking is scheduled. - Trigger **Contact Captured** Triggers when a new contact is captured in OnceHub. - Trigger **Contact Lifecycle Event** Triggers whenever a OnceHub contact is created or changed, so you catch the whole contact lifecycle in one place. - Trigger **Contact Updated** Triggers when an existing OnceHub contact is updated. - Trigger **Conversation Abandoned** Triggers when a website visitor stops replying to a OnceHub chatbot for more than ten minutes and the conversation is abandoned. - Trigger **Conversation Closed** Triggers when a OnceHub chatbot conversation is closed. - Trigger **Conversation Lifecycle Event** Triggers on any OnceHub conversation event — started, closed or abandoned — with the event name included so you can branch on it. - Trigger **Conversation Started** Triggers when a website visitor sends their first message to a OnceHub chatbot and a conversation starts. - Trigger **Reassigned Booking** Triggers when a OnceHub booking is reassigned to a different host. - Action **Cancel Booking** Cancels a OnceHub booking, optionally with a reason and without emailing the customer. - Action **Create Contact** Creates a new contact in OnceHub. Give at least an email address or a mobile number. - Action **Create One-Time Booking Link** Creates a one-time booking link for a published OnceHub booking calendar, optionally prefilling the booking form and pinning the host or duration. - Action **Delete Contact** Deletes a contact from OnceHub. - Action **Find Contact** Finds a OnceHub contact by email address. - Action **Get Available Time Slots** Returns the open meeting times on a OnceHub booking calendar for the window you choose. - Action **Get Booking Calendar** Returns one OnceHub booking calendar with its host, public link and meeting length. - Action **Get Booking Details** Returns one OnceHub booking with its time, customer details and booking form answers. - Action **Get Contact** Returns one OnceHub contact with its details and custom fields. - Action **Get Contact's Future Meetings** Returns a contact's upcoming OnceHub meetings — the bookings that start after the time you give. - Action **List Booking Calendars** Lists the booking calendars in your OnceHub account. - Action **List Bookings** Lists OnceHub bookings, with optional filters for status, contact, host, calendar and date range. - Action **List Contacts** Lists the contacts in your OnceHub account, with optional email and date filters. - Action **Mark Booking as No-Show** Marks a OnceHub booking as a no-show. - Action **Reassign Booking** Reassigns a OnceHub booking to a different host, optionally naming the video conferencing service to use. - Action **Request Reschedule** Asks the customer to pick a new time for a OnceHub booking, optionally telling them why. - Action **Update Contact** Updates an existing OnceHub contact. Only the fields you fill in are changed; anything left blank keeps its current value. - 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 - [ **OnceHub** Capture, qualify, and engage with inbound leads using ScheduleOnce, ChatOnce, FormOnce and SubmitOnce.](https://apiant.ai/connections/oncehub) - [ **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 OnceHub - [ **OnceHub to HeadshotPro** HeadshotPro is an AI Headshot Generator for Professional Headshots.](https://apiant.ai/connect/oncehub-to-headshotpro) - [ **OnceHub to Honeyhive** Observability and evaluation platform for tracing, testing, and monitoring AI agents in production.](https://apiant.ai/connect/oncehub-to-honeyhive) - [ **OnceHub to Powerlink** Cloud-based CRM platform (formerly Powerlink) for managing customer data, sales, and business workflows.](https://apiant.ai/connect/oncehub-to-powerlink) - [ **OnceHub to Zoho Calendar** Zoho Calendar is an online personal and business calendar app that helps you plan your schedule, track daily...](https://apiant.ai/connect/oncehub-to-zoho-calendar) - [ **OnceHub to Zoho Desk** Zoho Desk is web-based customer service software designed to help you focus more on creating customer...](https://apiant.ai/connect/oncehub-to-zoho-desk) - [ **OnceHub to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/oncehub-to-hubspot) ## 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 ## OnceHub and PostStack, answered ### ### What can start an automation from OnceHub? Any of OnceHub's 15 triggers in the catalog, including Booking Completed, Contact Updated, Booking Lifecycle Event and Booking No-Show. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in PostStack when something happens in OnceHub? 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 OnceHub? Yes. When something happens in PostStack, your agent can act in OnceHub too. This page covers both directions: PostStack's triggers and OnceHub's actions are listed here as well. ### ### Do I have to build a connector for OnceHub 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 OnceHub 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.