Integration
Connect Affinity to Lettr
When New List fires in Affinity, your agent runs Add contact in Lettr. Describe the whole flow and it is built, tested on every scenario and kept running.
What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it.
Build solutions, not workarounds.
What do you want Affinity and Lettr to do together?
Ask the assistant
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 Affinity can start in Lettr
When New List in Affinity
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 Affinity and Lettr
Triggers and actions 6 triggers · 25 actions
- Field Value Changes
Triggers when a field value is added, updated or removed in Affinity.
- New List
Triggers when a new list is created in Affinity.
- New List Entry
Triggers when a new entry is added to an Affinity list.
- New Opportunity
Triggers when a new opportunity is added in Affinity.
- New Organization
Triggers when a new organization is added in Affinity.
- New Person
Triggers when a new person is added in Affinity.
- Add field value
Sets the value of a field on a list entry (a row on an Affinity list), such as a status dropdown, number, date, text, person or company field.
- Add reminder
Creates a one-time or recurring reminder in Affinity for a person, company or opportunity, assigned to an internal user.
- Delete opportunity
Deletes an opportunity in Affinity.
- Delete person
Deletes a person from Affinity. Internal people in your organization cannot be deleted.
- Find a List Entry
Finds an entry on an Affinity list by the name, email or domain of its person, organization or opportunity.
- Find an Organization
Finds Affinity organizations by name or domain and returns the best match.
- Find a Person
Finds Affinity persons by name or email address and returns the best match.
- Find opportunities
Finds opportunities whose name contains the text you give, returning the first match and all matches.
- Get an Opportunity
Returns one Affinity opportunity by ID, with its name and the list it belongs to.
- Get an Organization
Returns one Affinity organization (company) by ID, with its name and domains.
- Get a Person
Returns one Affinity person by ID, with their name and email addresses.
- List lists
Returns the lists in your Affinity workspace that you can view, optionally filtered by name.
- Update field value
Sets the value of a single field on a list entry (row) in an Affinity list, replacing its current value.
- Update opportunity
Renames an existing opportunity in Affinity.
- 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
Affinity and Lettr, answered
What can start an automation from Affinity?
Any of Affinity's 6 triggers in the catalog, including New List, New List Entry, New Opportunity and New Organization. Describe the moment in plain language and your agent picks the right one.
What can your agent do in Lettr when something happens in Affinity?
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 Affinity?
Lettr has no triggers in the catalog today, so automations start in Affinity. 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 Affinity 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 Affinity 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.