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What do you want Stripe and Lettr to do together?
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Connect your AI client
Give your AI client this address.
https://mcp.apiant.aiOne 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.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 Stripe can start in Lettr
When New Charge in Stripe
then Add contact 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 Stripe and Lettr
Triggers and actions 11 triggers · 32 actions
- New Charge
Triggers when a new charge is created.
- New Charge (instant)
Fires instantly when a charge succeeds in Stripe, via a self-registered webhook (charge.succeeded). The platform registers/deletes the Stripe webhook endpoint automatically at automation activation/deactivation. Payload binds as {{ trigger.body.* }}.
- New Customer
Triggers when a new customer is created.
- New Event
Triggers when a new Stripe event is created (covers all event types via the Events API).
- New Invoice
Triggers when a new invoice is created.
- New paid and available charge
Triggered when a new paid and available charge is created.
- New paid charge
Triggered when a new paid charge is created.
- New plan
Triggered when a new plan is created.
- New Product
Triggers when a new product is created.
- New Refund
Triggers when a new refund is created.
- New Subscription
Triggers when a new subscription is created.
- Cancel Subscription
Cancels a subscription by its ID.
- Create Charge
Creates a charge. Amount is in the smallest currency unit (e.g. cents).
- Create charges (bulk charge creation)
Creates a charge in Stripe.
- Create Customer
Creates a new customer in Stripe.
- Create Payment Intent
Creates a PaymentIntent (the modern Stripe payment flow). Amount is in the smallest currency unit.
- Create Price
Creates a price for a product. unit_amount is in the smallest currency unit.
- Create Product
Creates a product (a good or service) in Stripe.
- Create Refund
Refunds a charge or payment intent. Provide charge or payment_intent; amount optional for partial refund.
- Create refund by charge id (distinct from Create Refund)
Creates a refund for a specific charge id.
- Create Subscription
Creates a subscription for a customer to one or more prices.
- Delete Customer
Permanently deletes a customer by ID.
- Find Customer by Email
Searches for customers matching an email address.
- Get Charge
Retrieves a charge by its ID.
- Get charge details (distinct from Get Charge)
Retrieves a charge's details by its charge id.
- Get Customer
Retrieves a customer by their Stripe ID.
- Get Invoice
Retrieves an invoice by its ID.
- Get Refund
Retrieves a refund by its ID.
- Get Subscription
Retrieves a subscription by its ID.
- Get transaction details
Retrieves a transaction's details by its transaction id.
- List balance transactions
List balance transactions (txn_xxx) for the account, most recent first.
- Update Customer
Updates an existing customer by ID.
- Add audience list
Creates a new audience list in Lettr with the given name and returns the created list.
- 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.
- 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.
- 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.
- Delete contact
Permanently deletes a contact from your Lettr audience.
- Get contact
Returns a single audience contact, including its subscription status, custom properties, lists and topics.
- Get template
Returns a single email template by its slug, including its HTML, editor content, purpose, status and version details.
- List audience lists
Returns all audience lists in your Lettr team, with each list's name and contact count.
- List contacts
Returns the contacts in your Lettr audience, optionally narrowed by a search term, subscription status, list or segment.
- List templates
Returns the email templates in a Lettr project, optionally limited to one folder or to transactional or campaign templates.
- 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.
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
Stripe and Lettr, answered
What can start an automation from Stripe?
Any of Stripe's 11 triggers in the catalog, including New Charge, New Charge (instant), New Customer and New Event. Describe the moment in plain language and your agent picks the right one.
What can your agent do in Lettr when something happens in Stripe?
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 Stripe?
Lettr has no triggers in the catalog today, so automations start in Stripe. 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 Stripe 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 Stripe 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.