--- title: "Connect Harpoon to Lob - APIANT.ai" description: "When \"New Client\" fires in Harpoon, your agent runs \"Create Address\" in Lob. Describe the whole flow and it is built, tested on every scenario and kept running." canonical: "https://apiant.ai/connect/harpoon-to-lob" --- # Connect Harpoon to Lob When **New Client** fires in [Harpoon](https://apiant.ai/connections/harpoon), your agent runs **Create Address** in [Lob](https://apiant.ai/connections/lob). Describe the whole flow and it is built, tested on every scenario and kept running. Harpoon **9** triggers Harpoon **46** actions Lob **40** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Harpoon and Lob 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 Harpoon can start in Lob - When **New Client** in Harpoon then **Create Address** in Lob - When **New Contact** in Harpoon then **Create Bank Account** in Lob 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 Harpoon and Lob ## Triggers and actions 9 triggers · 86 actions - Trigger **New Client** Triggered when a new client is created in Harpoon. - Trigger **New Contact** Triggered when a new contact is created in Harpoon. - Trigger **New Expense** Triggered when a new expense is created in your Harpoon account. - Trigger **New Expense Category** Triggered when a new expense category is created in Harpoon. - Trigger **New Invoice** Triggered when a new invoice is created in Harpoon. - Trigger **New Payment** Triggered when a new payment is recorded in your Harpoon account. - Trigger **New Project** Triggered when a new project is created in Harpoon. - Trigger **New Task Category** Triggered when a new task category is added in your Harpoon account. - Trigger **New Time Entry** Triggered when a new time entry is logged in Harpoon. - Action **Add Credit Entry** Creates a new credit entry on a client's account in Harpoon, recording an amount, a date and an optional note or originating invoice. Returns the credit entry that was created. - Action **Add Invoice** Creates a new invoice in Harpoon for a client or project, with an invoice number, issue date, and optional line items. Returns the invoice that was created. - Action **Add Lead Source** Creates a new lead source in Harpoon, so new clients can be tagged with where they came from. Returns the lead source that was created. - Action **Add Note** Adds a note to a client, project or invoice in Harpoon. Returns the note that was created. - Action **Add Team** Creates a new team in your Harpoon account. Harpoon populates the new team from your account details; the API accepts no team attributes on creation. - Action **Clone Time Entry** Creates a copy of an existing time entry in Harpoon. The copy keeps the original's project, task and description, and starts with today's date and zero hours logged. - Action **Create Contact** Creates a contact person under a Harpoon client, with their name, email address, and phone number. Returns the contact that was created. - Action **Create Expense** Records a one-off expense in Harpoon with its date, amount, and vendor, optionally attributed to a client, project, or expense category. Returns the expense that was created. - Action **Create Expense Category** Creates a new expense category in your Harpoon account so expenses can be grouped under it. - Action **Create Project** Creates a project in Harpoon for a client, with its budget, rate, and start and end dates. Returns the project that was created. - Action **Create Time Entry** Logs hours worked in Harpoon for a team member on a given date, optionally against a client or project. Returns the time entry that was created. - Action **Delete Client** Deletes a client from your Harpoon account. - Action **Delete Expense** Permanently deletes an expense from your Harpoon account. - Action **Delete Invoice** Permanently removes an invoice from Harpoon. Returns Harpoon's confirmation that the invoice was deleted. - Action **Delete Note** Deletes a note from your Harpoon account. - Action **Delete Recurring Expense** Deletes a recurring expense template from Harpoon by its id, so it stops generating new expenses. - Action **Delete Recurring Invoice** Stops and removes a recurring invoice schedule in Harpoon so it no longer generates invoices. Returns Harpoon's confirmation that it was deleted. - Action **Delete Time Entry** Deletes a time entry from your Harpoon account. - Action **Get Client** Returns a single client from your Harpoon account, including its name, contact details and other stored attributes. - Action **Get Client Credits** Returns a client's credit entries in Harpoon, along with the credit still available on the account. - Action **Get Contact** Returns a single Harpoon contact, including their name, email address, phone number, and the client they belong to. - Action **Get Estimate** Returns a single estimate from your Harpoon account, including its client, line items, totals and status. - Action **Get Expense** Returns a single expense from your Harpoon account, including its amount, date, vendor, category and the client or project it is attached to. - Action **Get Expense Category** Returns a single Harpoon expense category with every detail it carries, including its name and budget settings. - Action **Get Invoice** Fetches one invoice from Harpoon by its id, with its client, line items and payment totals. An error occurs if the invoice is not found. - Action **Get Lead Source** Returns a single lead source from your Harpoon account. - Action **Get Project** Returns a single project from your Harpoon account, including its client, budget and status. - Action **Get Recurring Expense** Fetches one recurring expense template from Harpoon by its id, with its vendor, amount, frequency and schedule. An error occurs if it is not found. - Action **Get Recurring Invoice** Returns a single recurring invoice schedule from Harpoon, including its client, frequency, dates, and line items. - Action **Get Task** Returns a single task category from your Harpoon account, including its name and hourly rate. - Action **Get Team** Returns a single team from your Harpoon account, including its name, email address, phone, address, owner and whether it is active. - Action **Get Time Entry** Returns a single tracked time entry from your Harpoon account, including its date, hours, client, project and notes. - Action **List Contacts** Returns the contacts in your Harpoon account, including each contact's name, email address and phone number. - Action **List Estimates** Returns the estimates in a Harpoon account, optionally narrowed to a year, client, project, status, or search text. - Action **List Expense Categories** Returns the expense categories set up in Harpoon, each with its budget settings. - Action **List Expenses** Returns the expenses in your Harpoon account, optionally narrowed by date range, client, project, category, billing status or search text. - Action **List Invoices** Returns the invoices in your Harpoon account, optionally narrowed by year, client, project, status or a search term. - Action **List Projects** Returns the projects in a Harpoon account, with their client, budget, rate, and dates. - Action **List Teams** Returns the teams in your Harpoon account, along with the total number of teams found. - Action **List Time Entries** Returns time entries from your Harpoon account — either the timers running now or logged history for a date range — optionally narrowed by client, project, task, team member or billing status. - Action **Update Expense** Updates an existing expense in your Harpoon account. Only the values you supply are changed. - Action **Update Invoice** Updates an existing invoice in your Harpoon account. Only the values you supply are changed. - Action **Update Project** Updates an existing project in Harpoon — its name, client, billing type, status, dates, budget and task rates. Returns the updated project. - Action **Update Recurring Expense** Updates a recurring expense in Harpoon — its vendor, amount, frequency, category, dates, and status. Anything left blank keeps its current value. Returns the updated recurring expense. - Action **Update Recurring Invoice** Updates an existing recurring invoice template in your Harpoon account. Only the values you supply are changed. - Action **Update Time Entry** Updates an existing time entry in Harpoon — its date, hours, description, project, task or billing state. - Action **Autocomplete US Address** Suggests complete US street addresses from the first part of one a person has typed, so an address field can autocomplete as they type. - Action **Bulk Verify International Addresses** Checks a batch of non-US addresses at once and returns each one standardized, with whether it is deliverable. - Action **Cancel Check** Cancels a check in Lob so it is not mailed. Only works while the check is still in the pre-print window. - Action **Cancel Letter** Cancels a letter in Lob so it is not mailed. Only works while the letter is still in the pre-print window. - Action **Cancel Postcard** Cancels a postcard in Lob so it is not mailed. Only works while the postcard is still in the pre-print window. - Action **Create Address** Saves an address in your Lob address book so you can reuse it as a sender or recipient on later mailings. - Action **Create Bank Account** Saves a bank account in Lob so you can send checks from it. Returns the new bank account's ID and whether it has been verified yet. - Action **Create Template** Saves a reusable HTML template in Lob that letters, postcards and checks can be built from. Returns the new template's ID and its published version. - Action **Delete Address** Deletes a saved address from Lob. Returns the deleted address's ID. - Action **Delete Bank Account** Deletes a saved bank account from Lob. Returns the deleted bank account's ID. - Action **Delete Template** Deletes an HTML template from Lob. Returns the deleted template's ID. - Action **Get Address** Returns one saved address from Lob by its ID, including the recipient details and any name/value pairs stored on it. - Action **Get Bank Account** Returns one saved bank account from Lob by its ID, including whether it has been verified. - Action **Get Check** Returns one check from Lob by its ID, including its amount, status and delivery tracking events. - Action **Get Letter** Returns one letter from Lob by its ID, including its status, addresses and delivery tracking events. - Action **Get Postcard** Returns one postcard from Lob by its ID, including its status, addresses and delivery tracking events. - Action **Get Template** Returns one HTML template from Lob by its ID, including its published version and version history. - Action **List Addresses** Returns the saved addresses in your Lob address book, newest first, with cursors for paging through more. - Action **List Bank Accounts** Returns the bank accounts saved in your Lob account, newest first, with cursors for paging through more. - Action **List Booklets** Returns the booklets you have created in Lob, newest first, with cursors for paging through more. - Action **List Campaigns** Returns the direct-mail campaigns in your Lob account, newest first, with cursors for paging through more. - Action **List Checks** Returns the checks you have sent through Lob, newest first, with cursors for paging through more. - Action **List Informed Delivery Campaigns** Returns the USPS Informed Delivery campaigns in your Lob account, newest first, with cursors for paging through more. - Action **List Letters** Returns the letters you have sent through Lob, newest first, with cursors for paging through more. - Action **List Postcards** Returns the postcards you have sent through Lob, newest first, with cursors for paging through more. - Action **List QR Code Analytics** Returns the QR code scans recorded on your Lob mailpieces — who scanned, when, and how many times — plus the overall scan total. - Action **List Snap Packs** Returns the snap packs you have sent through Lob, newest first, with cursors for paging through more. - Action **List Templates** Returns the saved HTML templates in your Lob account, newest first, with cursors for paging through more. - Action **List Uploads** Returns the recipient-list uploads in your Lob account, optionally narrowed to one campaign. - Action **Look Up ZIP Code** Looks up a US ZIP code and returns the cities, states and counties it covers, plus the USPS ZIP code type. - Action **Reverse Geocode Lookup** Takes a latitude and longitude and returns the nearest US ZIP codes with their city, state and distance from that point. - Action **Send Check** Prints and mails a physical check drawn on your Lob bank account to the recipient address you name. - Action **Send Letter** Prints and mails a letter to the recipient address you name, from a PDF, an HTML body, or a saved Lob template. - Action **Send Postcard** Prints and mails a postcard to the recipient address you name, using front and back artwork from a URL, HTML, or a saved Lob template. - Action **Update Template** Changes an existing Lob HTML template - its description, or which saved version is the live one. Anything you leave blank is left as it was. - Action **Validate Recipient Identity** Checks whether a person or company name is actually associated with a US address, and returns a confidence level and match score. - Action **Verify Bank Account** Confirms a Lob bank account by submitting the two micro-deposit amounts, so the account can be used to send checks. - Action **Verify International Address** Checks a non-US address, standardizes it, and tells you whether mail sent there is likely to be delivered. - Action **Verify Single Line US Address** Checks a US address given as one single line, standardizes it, and tells you whether mail sent there is deliverable. - Action **Verify US Address** Checks a US address, standardizes it to USPS format, and tells you whether mail sent there is deliverable. ## Each app on its own - [ **Harpoon** Harpoon is a financial planning, scheduling, time-tracking, invoicing, and budgeting platform for...](https://apiant.ai/connections/harpoon) - [ **Lob** Lob makes it easy to seamlessly print and mail letters, postcards, photos, posters and more via a web API.](https://apiant.ai/connections/lob) Reviews ## What our customers say ## More from Harpoon - [ **Harpoon to Bugcrowd** Bugcrowd API for interacting and tracking the reported issues programmatically](https://apiant.ai/connect/harpoon-to-bugcrowd) - [ **Harpoon to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/harpoon-to-hubspot) - [ **Harpoon to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/harpoon-to-salesforce) - [ **Harpoon to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/harpoon-to-slack) - [ **Harpoon to Google Sheets** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/harpoon-to-google-sheets) - [ **Harpoon to Gmail** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/harpoon-to-gmail) ## More into Lob - [ **Smsmobileapi to Lob** Smsmobileapi is a tool that uses your own mobile to send and receive SMS, track missed, incoming and...](https://apiant.ai/connect/smsmobileapi-to-lob) - [ **HubSpot to Lob** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-lob) - [ **Salesforce to Lob** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-lob) - [ **Slack to Lob** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-lob) - [ **Google Sheets to Lob** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-lob) - [ **Gmail to Lob** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-lob) Questions ## Harpoon and Lob, answered ### ### What can start an automation from Harpoon? Any of Harpoon's 9 triggers in the catalog, including New Client, New Contact, New Expense and New Expense Category. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Lob when something happens in Harpoon? Any of Lob's 40 actions, including Create Address, Create Bank Account, Create Template and Send Check. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from Lob to Harpoon? Lob has no triggers in the catalog today, so automations start in Harpoon. If you need the other direction, ask: your agent reads Lob's API documentation and adds it. ### ### Do I have to build a connector for Harpoon or Lob? 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 Harpoon and Lob 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.