Thanks.io for AI agents

Thanks.io automates direct mail, including postcards, letters, and notecards with handwritten-style fonts, for businesses running physical mail campaigns alongside their digital marketing. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Thanks.io See the 29 actions ↓

MarketingAPI keyMCP + RESTthanks.io

AUDIT LOG · THANKS.IOPOLICY: acme-support

09:41:07 · claude · u_8f2read

thanks_io.list_mailing_lists

List Mailing Lists✓ allowed · 212ms

09:41:08 · claude · u_8f2read

thanks_io.list_image_templates

List Image Templates✓ allowed · 164ms

09:41:09 · claude · u_8f2write

thanks_io.create_mailing_list

Create Mailing List✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

thanks_io.delete_sub_account

Delete Sub-Account✕ blocked · policy: deny

EVERY THANKS.IO CALL, ON THE RECORD

01 · USE CASES

What agents do in Thanks.io.

Preview a postcard before sending

Generate a preview of a postcard's design and message before it goes to print.

Add a recipient to a mailing list

Add a new address to a mailing list ahead of a scheduled send.

Confirm before sending a mail piece

Get sign-off before executing a stored send, since a printed and mailed postcard can't be recalled.

02 · ACTIONS

29 Thanks.io actions, graded by risk.

Every Thanks.io action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

thanks_io.list_mailing_lists
List Mailing Lists
thanks_io.list_image_templates
List Image Templates
thanks_io.list_message_templates
List Message Templates
thanks_io.list_handwriting_styles
List Handwriting Styles

write

Create and change things. Allow, or ask the user first.

thanks_io.send_postcard
Send Postcard
thanks_io.create_mailing_list
Create Mailing List
thanks_io.add_recipient_to_mailing_list
Add Recipient to Mailing List
thanks_io.orders_list
List Orders
thanks_io.recipients_update
Update Recipient
thanks_io.sub_accounts_list
List Sub Accounts
thanks_io.sub_accounts_show
Get Sub Account Details
thanks_io.execute_stored_send
Execute Stored Send
thanks_io.sub_accounts_create
Create Sub-Account
thanks_io.sub_accounts_update
Update Sub-Account
thanks_io.order_preview_letter
Preview letter send
thanks_io.stored_send_notecard
Stored Send Notecard
thanks_io.stored_send_postcard
Stored Send Postcard
thanks_io.order_preview_notecard
Preview Notecard
thanks_io.recipients_get_details
Get Recipient Details
thanks_io.recipients_create_multi
Create Multiple Recipients

+ 5 MORE

destructive

Delete, cancel or archive. Ask first, or deny outright.

thanks_io.delete_sub_account
Delete Sub-Account
thanks_io.delete_mailing_list
Delete Mailing List
thanks_io.delete_recipient_from_mailing_list
Delete Recipient from Mailing List
thanks_io.recipients_delete_by_address
Delete Recipient by Address

03 · HOW IT WORKS

Thanks.io in three steps.

01Your users connect Thanks.ioThey add their Thanks.io api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create Mailing List” can wait for the user, and “delete Sub-Account” can be denied outright.
03Any agent can actYour agent calls Thanks.io through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('thanks_io', {
  read: 'allow',
  write: 'ask',        // create_mailing_list
  destructive: 'deny',  // delete_sub_account
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Thanks.io connects.

Users add their Thanks.io api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Thanks.io connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Thanks.io from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More marketing apps.

Meta Ads67 actions

ActiveCampaign298 actions ActiveTrail159 actions

Adobe Marketing Agent12 actions

07 · FAQ

Thanks.io and Arc0, answered.

Q01

Can I use Thanks.io with Claude, ChatGPT or Cursor?

Yes. Connect Thanks.io to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Thanks.io actions you allow.

Q02

How do users connect Thanks.io?

Users add their Thanks.io api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Thanks.io actions can my agent take?

29 in total: 4 read, 21 write and 4 destructive, such as “create Mailing List”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Thanks.io?

Yes. Actions like “delete Sub-Account” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Thanks.io too?

Yes. The same Thanks.io connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Thanks.io into your agent.

Your users connect Thanks.io once, under your brand. Your agent gets 29 actions behind your policies, with every call on the record.

Connect Thanks.io Browse all apps →

Free to build · MCP + REST · Audit log on every plan