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What do you want MailUp and TaxJar to do together?
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https://mcp.apiant.aiAny 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.aiStart Claude Code there, approve the server, and sign in in the browser page it opens.
Claude Code guide (opens in a new tab)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)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)Zed
Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server.
Setup guide (opens in a new tab)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)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)Example flows
What MailUp can start in TaxJar
When New Email Message in List in MailUp
then Create a Customer in TaxJar
When New Group in MailUp
then Create an Order Transaction in TaxJar
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 MailUp and TaxJar
Triggers and actions 4 triggers · 45 actions
Trigger
New Email Message in ListA new email message was created in the list. MailUp is a multi-list environment and messages are list-specific.
Trigger
New GroupNew group added to the specified list. MailUp is a multi-list environment and groups are list-specific.
Trigger
New Recipient SubscribedThere is a new subscriber in the specified list. MailUp is a multi-list environment.
Trigger
New Recipient UnsubscribedA recipient unsubscribed from the specified list. MailUp is a multi-list environment.
Action
Add listCreate a new list. POST Console/List
Action
Add Recipient to GroupAdd recipient to the specified group on the list.
Action
Add Recipient to ListAdds a new recipient to the specified list as a subscriber.
Action
Create New Email MessageCreate a new email message on the specified list.
Action
Create New GroupAdd a new group to the specified list. MailUp is a multi-list environment.
Action
Delete email messageDelete an email message. DELETE Console/List/{id_List}/Email/{id_Message}
Action
Delete groupDelete a group in a list. DELETE Console/List/{id_List}/Group/{id_Group}
Action
Delete listDelete a list. DELETE Console/List/{id_List}
Action
Get email messageRetrieve email message details. GET Console/List/{id_List}/Email/{id_Message}
Action
Get listRetrieve list details by id. GET Console/List/{id_List}
Action
List email messagesRetrieve email messages of a list. GET Console/List/{id_List}/Emails
Action
List Email Message Sendingslists the sendings (send tasks, with recipients count and status) created for an email message.
Action
List Group RecipientsLists the recipients in a MailUp group (GET Console/Group/{id_group}/Recipients), with id, email, name and personal data fields.
Action
List groupsRetrieve groups of a list. GET Console/List/{id_List}/Groups
Action
List listsRetrieve the console's lists. GET Console/List on services.mailup.com/API/v1.1/Rest/ConsoleService.svc
Action
List subscribed recipientsRetrieve subscribed recipients of a list. GET Console/List/{id_List}/Recipients/Subscribed
Action
Remove recipient from groupUnsubscribe a recipient from a group. DELETE Console/Group/{id_Group}/Unsubscribe/{id_Recipient}
Action
Remove Recipient From ListThis method unsubscribe the given recipient from the specified list.
Action
Send Message to Email AddressSends the specified message (previously created in MailUp in the specified List) to the email address specified.
Action
Send Message to GroupSend a message to a predefined group in the specified list.
Action
Send message to listSend an email message to all recipients of a list. POST Console/List/{id_List}/Email/{id_Message}/Send
Action
Unsubscribe recipient from listUnsubscribe a recipient from a list. DELETE Console/List/{id_List}/Unsubscribe/{id_Recipient}
Action
Update email messageModify an email message. PUT Console/List/{id_List}/Email/{id_Message}
Action
Update groupModify a group in a list. PUT Console/List/{id_List}/Group/{id_Group}
Action
Update listModify details of a list. PUT Console/List/{id_List}
Action
Calculate Sales Tax for an OrderWorks out the sales tax due on an order from the ship-from and ship-to addresses, the order amount and its line items.
Action
Create a CustomerCreates a customer in TaxJar with their exemption type and the regions the exemption applies to.
Action
Create an Order TransactionRecords a completed order in TaxJar so it counts towards your sales tax reporting.
Action
Create a Refund TransactionRecords a refund against an existing order in TaxJar so your sales tax reporting stays accurate.
Action
Get Two-Letter ISO Code for RegionLooks up the two-letter code for a state, province or country by name, using TaxJar's own list of regions.
Action
List CategoriesReturns TaxJar's product categories and the tax code to use for each one.
Action
List CustomersReturns the IDs of every customer in your TaxJar account.
Action
List Nexus RegionsReturns the states, provinces and countries where your TaxJar account has nexus and must collect tax.
Action
List OrdersReturns the IDs of the orders recorded in TaxJar, optionally limited to a date or date range.
Action
List RefundsReturns the IDs of the refunds recorded in TaxJar, optionally limited to a date or date range.
Action
Rates for LocationReturns the sales tax rates that apply at a location, broken down by state, county and city.
Action
Show a CustomerReturns one customer from TaxJar, including their exemption type and exempt regions.
Action
Show OrderReturns one order recorded in TaxJar, including its addresses, totals and line items.
Action
Show RefundReturns one refund recorded in TaxJar, including the order it applies to and the amounts refunded.
Action
Summarize Tax Rates for All RegionsReturns the minimum and average sales tax rate for every state, province and country TaxJar covers.
Action
Update a CustomerUpdates a customer in TaxJar. Only the fields you supply are changed.
Action
Update an Order TransactionUpdates an order already recorded in TaxJar. Only the fields you supply are changed.
Action
Update a Refund TransactionUpdates a refund already recorded in TaxJar. Only the fields you supply are changed.
Action
Validate an AddressChecks a US address and returns TaxJar's corrected version of it, so tax is worked out on a clean address.
Action
Validate a VAT NumberChecks whether a VAT number is valid and returns the business name and address registered against it.
No trigger or action matches that. Ask your agent to add it: it reads the API documentation and builds what you describe.
Each app on its own
Reviews
What our customers say
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Questions
MailUp and TaxJar, answered
What can start an automation from MailUp?
Any of MailUp's 4 triggers in the catalog, including New Email Message in List, New Group, New Recipient Subscribed and New Recipient Unsubscribed. Describe the moment in plain language and your agent picks the right one.
What can your agent do in TaxJar when something happens in MailUp?
Any of TaxJar's 20 actions, including Create a Customer, Create an Order Transaction, Create a Refund Transaction and Update a Customer. Your agent maps the data both ways and tests every scenario before it ships.
Can it also run from TaxJar to MailUp?
TaxJar has no triggers in the catalog today, so automations start in MailUp. If you need the other direction, ask: your agent reads TaxJar's API documentation and adds it.
Do I have to build a connector for MailUp or TaxJar?
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.
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.