---
title: "Customer.io MCP server for AI agents - actionlake"
description: "Give Claude 184 Customer.io actions through one MCP server: design, newsletter, broadcast. Your agent never holds the credential. 100,000 calls a month free."
canonical: https://actionlake.com/connectors/customer-io
updated: 2026-10-10
---

Connectors · Email & messaging

# Customer.io MCP server for AI agents.

actionlake is an MCP gateway: one remote MCP server that connects Claude and other MCP clients to Customer.io and the rest of your systems. It gives your agent 184 Customer.io actions (113 reads, 56 writes and 15 that wait for a confirmation) and holds the Customer.io credential itself, so the agent never does. It paces Customer.io's limits and records every call.

[Connect Customer.io free](https://actionlake.com/console?start=sandbox) [See pricing](https://actionlake.com/pricing)

100,000 free calls a month. No card, no email, no password: press Start a free sandbox on the next screen and keep the key it shows you.

`claude mcp add --transport http actionlake https://connect.actionlake.com/mcp`

the first call

```
do {
  action: "customerio.segments_list",
  intent: "check which Customer.io account is connected"
}
# List segments · read · 1 upstream call
```

- 184 actions in one signed file
- 113 read look, never change
- 56 write create and update
- 15 wait for a yes destructive, confirmed first

Set up

## Connect Customer.io in three steps.

1. 01
   ### Add actionlake to Claude.
   Run the command once in Claude Code; its consent page can create a free sandbox: 100,000 calls a month, no card. In the Claude app, add a custom connector with the URL below and paste your key on the consent page. Creating a new sandbox from the Claude app is not yet tested by us.
   `https://connect.actionlake.com/mcp`
2. 02
   ### Connect Customer.io.
   Bearer token. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead. actionlake stores what you paste write-only, sealed under your tenant's key.
   - `app_api_key` Customer.io App API Key
   - `api_base` Where your Customer.io lives: your api base
   ```
   account { op: "connections.requirements", service: "customerio" }
   # free: exactly what to paste, and what is found for you
   ```
3. 03
   ### Make the first call. Check before a write.
   Ask in plain words; Claude picks the action. Before anything changes, `check` validates the call and prices it, for free.
   ```
   do    { action: "customerio.segments_list" }
   # list segments · read · 1 upstream call
   check { action: "customerio.segments_delete", input: { … } }
   # free: inputs, permissions, cost and confirmations, nothing sent
   ```

Customer.io at a glance

**Sign-in**

Bearer token. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead.

**You provide**

`app_api_key`

**Setup fields**

`api_base`

**Limits we pace to**

10 calls a second, per connection

**API covered**

Customer.io API v1`api.customer.io`

**Built from**

Customer.io's documentation, read 19 September 2026[docs.customer.io](https://docs.customer.io/api/openapi.json)

**Service file**

Version 1.0.0, signed (Ed25519)

**Cached reads**

112 of 113 reads, for up to an hour; a write clears what it affects

**Ready-made plans**

8 in the store

**Shared entities**

4, so ask can line Customer.io up with your other systems

**Data**

Processed and stored in Sydney, Australia. No US region yet

Capabilities

## What an AI agent can do in Customer.io.

184 actions in 23 areas. Every one carries its effect, so a key can allow the reads and hold the rest.

- **113** read look, never change
- **56** write create and update
- **15** destructive wait for a confirmation

1. ### Design
   37
   19 read · 13 write · 5 destructive
   List email versions · List emails · Save an email version · Create an email
2. ### Newsletter
   23
   11 read · 9 write · 3 destructive
   List a one-time send's A/B test groups · List one-time send variants · List one-time sends · Create an A/B test group for a one-time send
3. ### Broadcast
   15
   12 read · 3 write · 0 destructive
   List broadcast actions · List broadcasts · Get a broadcast action · Get a broadcast
4. ### Transactional
   15
   7 read · 8 write · 0 destructive
   List all variants of a transactional message · List transactional messages · Send a transactional email · Send a transactional SMS
5. ### Campaign
   12
   10 read · 2 write · 0 destructive
   List automation actions · Get an automation action · Update an automation action · List automations
6. ### Asset
   9
   4 read · 3 write · 2 destructive
   List file assets · Create a folder · List folders · Get a file asset
7. ### Person
   9
   8 read · 1 write · 0 destructive
   List opt-outs in the workspace · Get customers by email · Lookup a customer's opt-outs · Lookup a customer's subscription preferences
8. ### Message
   8
   8 read · 0 write · 0 destructive
   List messages · Get messages for a broadcast · Get automation message metadata · Get delivery data for a one-time send

**15 more areas · 56 actions**

- Segment **8**
- Collection **7**
- Export **5**
- Reporting webhook **5**
- Suppression **5**
- Live notification **4**
- Object **4**
- Snippet **4**
- Sender identity **3**
- Subscription **3**
- Activity **2**
- Data index **2**
- Import **2**
- Info **1**
- Workspace **1**

Top actions

## The Customer.io API, shaped for agents.

The ids your agent types, what each does, and the one name it shares with other systems. 89 of Customer.io's 91 action names are shared with at least one other connector, so an agent learns them once.

| Action | What it does | Effect | Same name in |
| --- | --- | --- | --- |
| `customerio.segments_list` List segments | List segments | read | `comm.audience_segment.list` 22 connectors |
| `customerio.messages_list` List messages | List messages | read | `comm.delivery_event.list` 16 connectors |
| `customerio.person_segments_list` Lookup a customer's segments | Lookup a customer's segments | read | `comm.audience_segment.list` 22 connectors |
| `customerio.sender_identities_list` List sender identities | List sender identities | read | `comm.sending_domain.list` 18 connectors |
| `customerio.person_messages_list` Lookup messages sent to a customer | Lookup messages sent to a customer | read | `comm.delivery_event.list` 16 connectors |
| `customerio.broadcasts_list` List broadcasts | List broadcasts | read | `comm.campaign.list` 41 connectors |
| `customerio.newsletters_list` List one-time sends | List one-time sends | read | `comm.campaign.list` 41 connectors |
| `customerio.transactional_contents_list` List all variants of a transactional message | List all variants of a transactional message | read | `comm.email_template.list` 40 connectors |
| `customerio.segments_delete` Delete a segment | Delete a segment | destructive | `comm.audience_segment.delete` 15 connectors |
| `customerio.transactional_emails_create` Send a transactional email | Send a transactional email | write | `comm.email.send` 32 connectors |
| `customerio.transactional_sms_create` Send a transactional SMS | Send a transactional SMS | write | `comm.sms.send` 26 connectors |
| `customerio.transactional_whatsapps_create` Send a transactional WhatsApp message | Send a transactional WhatsApp message | write | `comm.sms.send` 26 connectors |

Try it

## Prompts to paste into Claude.

Each one names the Customer.io actions it will call, so you know what it reads and what it changes before you send it.

1. Read read
   List segments in Customer.io and tell me what stands out.
   calls `customerio.segments_list`
2. Plan write
   Trigger a broadcast and watch its first hour in Customer.io. Ask me before anything is sent or changed.
   calls `customerio.broadcasts_get` `customerio.broadcast_actions_list` `customerio.broadcast_triggers_create` `customerio.broadcast_trigger_errors_list` `customerio.broadcast_metrics_get` +1 more
3. Plan read
   Sweep recent opt-outs and confirm each person's state in Customer.io.
   calls `customerio.optouts_list` `customerio.subscription_channels_list` `customerio.people_get` `customerio.person_optouts_get` `customerio.person_subscription_preferences_get`
4. Write write
   Send a transactional email in Customer.io. Show me exactly what you will send before you save it.
   calls `customerio.transactional_emails_create`

The plan store

## Ready-made plans for Customer.io.

8 plans in the store. Install one and your agent runs it by name; the reply says which connections are still missing. A schedule can run a plan on a timetable. There are no triggers or webhooks, by design.

1. ### Report on every live campaign and its worst action
   Use it when Someone asks how the Customer.io campaigns are performing, or which step of a campaign is underperforming.
   **Effect**
   read
   **Steps**
   2 · loops
   **Needs**
   period and steps
   **Install**
   `customerio-campaign-performance-report`
2. ### Sweep recent opt-outs and confirm each person's state
   Use it when Someone needs to verify that recent opt-outs were honoured across channels.
   **Effect**
   read
   **Steps**
   3 · loops
   **Needs**
   from
   **Install**
   `customerio-optout-sweep`
3. ### Export customers and wait for the download link
   Use it when Someone needs a CSV of customers matching a filter and wants the download link, not just the job id.
   **Effect**
   write
   **Steps**
   4
   **Needs**
   body
   **Install**
   `customerio-export-customers-and-download`
4. ### Review a domain's bounces and suppress the worst addresses
   Use it when A domain is bouncing badly and someone wants one address suppressed after a human signs off.
   A person decides Suppress _email address_ (_suppression type_) so Customer.io stops sending to it.
   **Effect**
   write
   **Steps**
   4
   **Needs**
   domain name, email address and suppression type
   **Install**
   `customerio-suppress-bounced-domain`
5. ### Check a newsletter, get sign-off, then send it
   Use it when A newsletter is ready and someone must sign off before it is actually sent to the list.
   A person decides Send newsletter _newsletter id_ to its full audience now. This cannot be undone.
   **Effect**
   write
   **Steps**
   6
   **Needs**
   newsletter id
   **Install**
   `customerio-send-newsletter-with-approval`
6. ### Review an email design, get approval and publish it
   Use it when An email design has unpublished edits and someone must approve before it goes live in campaigns.
   A person decides Publish email design _id_ (_design name_) so live campaigns start using it.
   **Effect**
   write
   **Steps**
   7
   **Needs**
   id
   **Install**
   `customerio-publish-email-design`
7. ### Trigger a broadcast and watch its first hour
   Use it when A broadcast is ready to fire and someone wants sign-off plus an automatic check on how it landed.
   A person decides Trigger broadcast _broadcast id_ (_name_) to its audience now.
   **Effect**
   write
   **Steps**
   8
   **Needs**
   body and broadcast id
   **Install**
   `customerio-broadcast-launch-watch`
8. ### Prove a segment is unused, then delete it
   Use it when Someone wants to clean up an old Customer.io segment but must not break a campaign that still uses it.
   A person decides Delete segment _segment id_ (_name_) holding _count_ people. Dependencies were listed above.
   **Effect**
   destructive
   **Steps**
   5
   **Needs**
   segment id
   **Install**
   `customerio-audit-segment-before-delete`

install a plan

```
account { op: "plans.install", slug: "customerio-campaign-performance-report" }
# then ask for it by name; a schedule can run it on a timetable
```

Governance for Customer.io

## Destructive actions wait for a yes.

15 Customer.io actions are destructive. These are all of them:

- Delete a segment `customerio.segments_delete`
- Delete a one-time send `customerio.newsletters_delete`
- Delete an email `customerio.design_emails_delete`
- Delete an email version `customerio.design_email_versions_delete`
- Delete a file asset `customerio.assets_delete`
- Un-suppress an ESP-suppressed address `customerio.esp_suppressions_delete`
- Delete a folder `customerio.asset_folders_delete`
- Delete a folder `customerio.design_folders_delete`
- Delete a collection `customerio.collections_delete`
- Delete a snippet `customerio.snippets_delete`
- Delete a component `customerio.design_components_delete`
- Delete a reporting webhook `customerio.reporting_webhooks_delete`
- Delete a translation of a one-time send `customerio.newsletter_languages_delete`
- Delete a translation in a one-time send test group `customerio.newsletter_test_group_languages_delete`
- Delete an email translation `customerio.design_email_languages_delete`

A destructive action runs only with `confirm: true`. Under the `human` policy the agent cannot confirm for itself: the run stops until a named person approves, in the console or from a signed link in an email. The cap on a key is refused before the call is sent, never after.

do customerio.segments_delete confirm_policy: **human**

Delete a segment?

**intent:** the user asked me to delete a segment

run suspended · waiting for a named person · key _customerio-agent_ cannot confirm itself

In the console, or from an emailed signed link.

a key for this connector

```
account {
  op: "keys.create", name: "customerio-agent",
  allowed_actions: ["customerio.*"], cap_calls: 2000,
  confirm_policy: "human_for_writes",
  approval_rules: [
    { match: "customerio.segments_delete", approver: "lead@example.com" },
    { match: "customerio.newsletters_delete", approver: "lead@example.com" },
    { match: "customerio.design_emails_delete", approver: "lead@example.com" }
  ]
}
```

Illustrative. Scoped to Customer.io only, capped at 2,000 upstream calls, every write confirmed, and the destructive ones approved by a named person.

Cost

## What Customer.io costs on actionlake.

Every Customer.io action is one upstream call, the only thing actionlake bills. Searching, `check`, `cost`, `account` and any call Customer.io refused with 401, 403, 429 or a 5xx are free. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

- 1 upstream call per action all 184 Customer.io actions
- 184 actions page each page of a long list is one call
- 112 reads can be cached a cache hit costs nothing
- 100,000 calls a month, free paid plans from US$49 a month for 250,000

[See pricing](https://actionlake.com/pricing)

Action index

## Every Customer.io action.

184 actions by area: the id your agent calls, what it does, and its effect.

**Design 37**

- `customerio.design_components_create` Create a component write
- `customerio.design_components_delete` Delete a component destructive
- `customerio.design_components_get` Get a component read
- `customerio.design_components_list` List components read
- `customerio.design_components_update` Update a component write
- `customerio.design_email_languages_create` Create an email translation write
- `customerio.design_email_languages_delete` Delete an email translation destructive
- `customerio.design_email_languages_get` Get an email translation read
- `customerio.design_email_languages_list` List email translations read
- `customerio.design_email_languages_update` Update an email translation write
- `customerio.design_email_links_create` Link an email to a workflow write
- `customerio.design_email_previews_get` Preview an email read
- `customerio.design_email_publish_status_get` Get publish status read
- `customerio.design_email_publishes_create` Publish an email write
- `customerio.design_email_renders_get` Render an email read
- `customerio.design_email_reviews_get` Review an email read
- `customerio.design_email_unpublished_changes_get` Check for unpublished changes read
- `customerio.design_email_version_restores_create` Restore an email version write
- `customerio.design_email_versions_create` Save an email version write
- `customerio.design_email_versions_delete` Delete an email version destructive
- `customerio.design_email_versions_get` Get an email version read
- `customerio.design_email_versions_list` List email versions read
- `customerio.design_emails_create` Create an email write
- `customerio.design_emails_delete` Delete an email destructive
- `customerio.design_emails_get` Get an email read
- `customerio.design_emails_list` List emails read
- `customerio.design_emails_update` Update an email write
- `customerio.design_folders_create` Create a folder write
- `customerio.design_folders_delete` Delete a folder destructive
- `customerio.design_folders_get` Get a folder read
- `customerio.design_folders_list` List folders read
- `customerio.design_folders_update` Update a folder write
- `customerio.design_inbox_preview_clients_list` List inbox preview options read
- `customerio.design_inbox_preview_credits_get` Get preview credit balance read
- `customerio.design_inbox_preview_jobs_get` Get an inbox preview job read
- `customerio.design_inbox_preview_jobs_list` List inbox preview history read
- `customerio.design_inbox_previews_create` Send for inbox previews write

**Newsletter 23**

- `customerio.newsletter_languages_create` Add a translation to a one-time send write
- `customerio.newsletter_languages_delete` Delete a translation of a one-time send destructive
- `customerio.newsletter_languages_get` Get a one-time send translation read
- `customerio.newsletter_languages_update` Update a translation of a one-time send write
- `customerio.newsletter_link_metrics_get` Get click metrics for one-time send links read
- `customerio.newsletter_metrics_get` Get one-time send metrics read
- `customerio.newsletter_schedules_create` Schedule a one-time send write
- `customerio.newsletter_sends_create` Trigger a one-time send write
- `customerio.newsletter_test_group_languages_create` Add a translation to a one-time send test group write
- `customerio.newsletter_test_group_languages_delete` Delete a translation in a one-time send test group destructive
- `customerio.newsletter_test_group_languages_get` Get a translation in a one-time send test group read
- `customerio.newsletter_test_group_languages_update` Update a translation in a one-time send test group write
- `customerio.newsletter_test_groups_create` Create an A/B test group for a one-time send write
- `customerio.newsletter_test_groups_list` List a one-time send's A/B test groups read
- `customerio.newsletter_variant_link_metrics_get` Get click metrics for links in one-time send variants read
- `customerio.newsletter_variant_metrics_get` Get metrics for a test or translation variant of a one-time send read
- `customerio.newsletter_variants_get` Get a one-time send variant read
- `customerio.newsletter_variants_list` List one-time send variants read
- `customerio.newsletter_variants_update` Update a one-time send variant write
- `customerio.newsletters_create` Create and send a one-time send write
- `customerio.newsletters_delete` Delete a one-time send destructive
- `customerio.newsletters_get` Get a one-time send read
- `customerio.newsletters_list` List one-time sends read

**Broadcast 15**

- `customerio.broadcast_action_languages_get` Get a translation of a broadcast message read
- `customerio.broadcast_action_languages_update` Update a translation of a broadcast message write
- `customerio.broadcast_action_link_metrics_get` Get broadcast action link metrics read
- `customerio.broadcast_action_metrics_get` Get broadcast action metrics read
- `customerio.broadcast_actions_get` Get a broadcast action read
- `customerio.broadcast_actions_list` List broadcast actions read
- `customerio.broadcast_actions_update` Update a broadcast action write
- `customerio.broadcast_link_metrics_get` Get broadcast link metrics read
- `customerio.broadcast_metrics_get` Get broadcast metrics read
- `customerio.broadcast_trigger_errors_list` Get broadcast error descriptions read
- `customerio.broadcast_triggers_create` Send an API-triggered broadcast write
- `customerio.broadcast_triggers_get` Get the status of a broadcast read
- `customerio.broadcast_triggers_list` Get broadcast triggers read
- `customerio.broadcasts_get` Get a broadcast read
- `customerio.broadcasts_list` List broadcasts read

**Transactional 15**

- `customerio.transactional_contents_get` Get a translation of a transactional by ID read
- `customerio.transactional_contents_list` List all variants of a transactional message read
- `customerio.transactional_contents_update` Update a transactional message write
- `customerio.transactional_emails_create` Send a transactional email write
- `customerio.transactional_in_apps_create` Send a transactional in-app message write
- `customerio.transactional_inbox_messages_create` Send a transactional inbox message write
- `customerio.transactional_languages_get` Get a translation of a transactional message read
- `customerio.transactional_languages_update` Update a translation of a transactional message write
- `customerio.transactional_link_metrics_get` Get transactional message link metrics read
- `customerio.transactional_messages_get` Get a transactional message read
- `customerio.transactional_messages_list` List transactional messages read
- `customerio.transactional_metrics_get` Get transactional message metrics read
- `customerio.transactional_pushes_create` Send a transactional push write
- `customerio.transactional_sms_create` Send a transactional SMS write
- `customerio.transactional_whatsapps_create` Send a transactional WhatsApp message write

**Campaign 12**

- `customerio.campaign_action_languages_get` Get a translation of an automation message read
- `customerio.campaign_action_languages_update` Update a translation of an automation message write
- `customerio.campaign_action_link_metrics_get` Get link metrics for an action read
- `customerio.campaign_action_metrics_get` Get automation action metrics read
- `customerio.campaign_actions_get` Get an automation action read
- `customerio.campaign_actions_list` List automation actions read
- `customerio.campaign_actions_update` Update an automation action write
- `customerio.campaign_journey_metrics_get` Get automation journey metrics read
- `customerio.campaign_link_metrics_get` Get automation link metrics read
- `customerio.campaign_metrics_get` Get automation metrics read
- `customerio.campaigns_get` Get an automation read
- `customerio.campaigns_list` List automations read

**Asset 9**

- `customerio.asset_folders_create` Create a folder write
- `customerio.asset_folders_delete` Delete a folder destructive
- `customerio.asset_folders_get` Get a folder read
- `customerio.asset_folders_list` List folders read
- `customerio.asset_folders_update` Update a folder write
- `customerio.assets_delete` Delete a file asset destructive
- `customerio.assets_get` Get a file asset read
- `customerio.assets_list` List file assets read
- `customerio.assets_update` Update a file asset write

**Person 9**

- `customerio.optouts_list` List opt-outs in the workspace read
- `customerio.people_attributes_list` List customers, attributes, and devices read
- `customerio.people_by_email_list` Get customers by email read
- `customerio.people_get` Lookup a customer's attributes read
- `customerio.people_search` Search for customers read
- `customerio.person_optouts_get` Lookup a customer's opt-outs read
- `customerio.person_optouts_update` Update a customer's opt-outs write
- `customerio.person_relationships_list` Lookup a customer's relationships read
- `customerio.person_subscription_preferences_get` Lookup a customer's subscription preferences read

**Message 8**

- `customerio.archived_messages_get` Get an archived message read
- `customerio.broadcast_messages_list` Get messages for a broadcast read
- `customerio.campaign_messages_list` Get automation message metadata read
- `customerio.messages_get` Get a message read
- `customerio.messages_list` List messages read
- `customerio.newsletter_messages_list` Get delivery data for a one-time send read
- `customerio.person_messages_list` Lookup messages sent to a customer read
- `customerio.transactional_deliveries_list` Get transactional message deliveries read

**Segment 8**

- `customerio.person_segments_list` Lookup a customer's segments read
- `customerio.segment_customer_counts_get` Get a segment customer count read
- `customerio.segment_dependencies_get` Get a segment's dependencies read
- `customerio.segment_memberships_list` List customers in a segment read
- `customerio.segments_create` Create a manual segment write
- `customerio.segments_delete` Delete a segment destructive
- `customerio.segments_get` Get a segment read
- `customerio.segments_list` List segments read

**Collection 7**

- `customerio.collection_contents_get` Lookup collection contents read
- `customerio.collection_contents_update` Update the contents of a collection write
- `customerio.collections_create` Create a collection write
- `customerio.collections_delete` Delete a collection destructive
- `customerio.collections_get` Lookup a collection read
- `customerio.collections_list` List your collections read
- `customerio.collections_update` Update a collection write

**Export 5**

- `customerio.export_customers_create` Export customer data write
- `customerio.export_deliveries_create` Export information about deliveries write
- `customerio.export_downloads_get` Download an export read
- `customerio.exports_get` Get an export read
- `customerio.exports_list` List exports read

**Reporting webhook 5**

- `customerio.reporting_webhooks_create` Create a reporting webhook write
- `customerio.reporting_webhooks_delete` Delete a reporting webhook destructive
- `customerio.reporting_webhooks_get` Get a reporting webhook read
- `customerio.reporting_webhooks_list` List reporting webhooks read
- `customerio.reporting_webhooks_update` Update a webhook configuration write

**Suppression 5**

- `customerio.esp_domain_suppressions_list` Get ESP-suppressed emails by domain read
- `customerio.esp_suppressions_create` Suppress an email at the ESP write
- `customerio.esp_suppressions_delete` Un-suppress an ESP-suppressed address destructive
- `customerio.esp_suppressions_list` Get ESP-suppressed emails by type read
- `customerio.esp_suppressions_lookup_get` Look up an ESP-suppressed address read

**Live notification 4**

- `customerio.live_notification_ends_create` End a live notification write
- `customerio.live_notification_starts_create` Start a live notification write
- `customerio.live_notification_updates_create` Update a live notification write
- `customerio.live_notifications_get` Get a live notification's status read

**Object 4**

- `customerio.object_relationships_list` Get Object Relationships read
- `customerio.object_types_list` List object types read
- `customerio.objects_get` Get Object Attributes read
- `customerio.objects_search` Find objects read

**Snippet 4**

- `customerio.snippets_create` Create a snippet write
- `customerio.snippets_delete` Delete a snippet destructive
- `customerio.snippets_list` List snippets read
- `customerio.snippets_update` Update snippets write

**Sender identity 3**

- `customerio.sender_identities_get` Get a sender read
- `customerio.sender_identities_list` List sender identities read
- `customerio.sender_identity_usage_get` Get sender usage data read

**Subscription 3**

- `customerio.subscription_center_tokens_get` Generate a subscription center token read
- `customerio.subscription_channels_list` List subscription channels read
- `customerio.subscription_topics_list` List subscription topics read

**Activity 2**

- `customerio.activities_list` List activities read
- `customerio.person_activities_list` Lookup a customer's activities read

**Data index 2**

- `customerio.data_index_attributes_update` Add or update attributes write
- `customerio.data_index_events_update` Add or update events write

**Import 2**

- `customerio.imports_create` Import items in bulk write
- `customerio.imports_get` Retrieve a bulk import read

**Info 1**

- `customerio.info_ip_addresses_list` List IP addresses read

**Workspace 1**

- `customerio.workspaces_list` List workspaces read

Questions

## The Customer.io MCP server, answered.

**Is there a Customer.io MCP server for Claude?**

Yes. actionlake is an MCP gateway: a remote MCP server that gives Claude, or another MCP client, 184 Customer.io actions across design, newsletter, broadcast and transactional, through the same eight tools it uses for every other connector. actionlake is independent; it is not made or endorsed by Customer.io.

**What do I need to connect Customer.io?**

Customer.io App API Key. Plus your api base. The free call account { op: "connections.requirements", service: "customerio" } lists exactly what to paste.

**Can an AI agent delete or change things in Customer.io?**

Only if its key allows it, and only with an explicit confirmation. 15 Customer.io actions are destructive, including delete a segment, delete a one-time send and delete an email. Each runs only with confirm: true. Under the human confirm policy, or an approval rule on the key, the run waits until a named person approves it.

**Will an AI agent use up my Customer.io API limit?**

actionlake paces every call to the limits in the Customer.io service file: 10 calls a second per connection. Repeated reads are answered from cache (112 Customer.io actions can be), which never reaches Customer.io.

**What does a Customer.io action cost?**

One upstream call, the only unit actionlake bills. A list that pages bills one call per page (184 Customer.io actions page). Cache hits, searches, dry runs and calls Customer.io refused with 401, 403, 429 or a 5xx are free. The Free plan includes 100,000 calls a month with no card. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

**Which Customer.io API does it cover?**

The Customer.io API v1 at api.customer.io by default, or the base URL set when you connect. It is built from Customer.io's documentation as read on 19 September 2026. 184 actions in 23 areas, each one in the signed service file (version 1.0.0).

**Does actionlake keep my Customer.io data, and where?**

actionlake processes and stores data in Sydney, Australia; there is no US region yet. Reads may be cached for up to an hour, and a write clears the reads it affects. Each run's request and response is kept, sealed, for your plan's trace window: 1 day on Free, 3 days on Starter, 7 days on Pro, 14 days on Team, 30 days on Business and 30 days on Enterprise. Your Customer.io credential is sealed under your tenant's key, never logged and never returned. Your traffic is not used to train models.

**Which AI clients can use it?**

Claude Code, tested by us end to end, and the Claude app as a custom connector, tested by us with an existing key. Other MCP clients that support remote servers over Streamable HTTP (MCP revisions 2025-06-18 and 2025-11-25) and OAuth dynamic client registration, or a bearer header, should connect the same way; we have not tested them. Or plain REST, under the same action names.

## More connectors like Customer.io

Shares the most action names with

- [Mailchimp 47](https://actionlake.com/connectors/mailchimp)
- [Elastic Email 33](https://actionlake.com/connectors/elastic-email)
- [Salesforce Marketing Cloud Engagement 32](https://actionlake.com/connectors/salesforce-marketing-cloud-engagement)
- [Resend 31](https://actionlake.com/connectors/resend)
- [Bird 30](https://actionlake.com/connectors/bird)
- [Sinch Mailjet 28](https://actionlake.com/connectors/sinch-mailjet)

Joins with, on shared entities

- [Brevo 2](https://actionlake.com/connectors/brevo)
- [SMTP2GO 2](https://actionlake.com/connectors/smtp2go)
- [PostHog 1](https://actionlake.com/connectors/posthog)
- [Cvent 1](https://actionlake.com/connectors/cvent)
- [Qualtrics XM 1](https://actionlake.com/connectors/qualtrics-xm)
- [LinkedIn Marketing API 1](https://actionlake.com/connectors/linkedin-marketing-api)

Browse

- [All Email & messaging connectors](https://actionlake.com/connectors/category/email-and-messaging)
- [All connectors](https://actionlake.com/connectors)
- [How actionlake compares](https://actionlake.com/compare)

actionlake is independent. It is not made or endorsed by Customer.io; the name is the vendor's own. Counts are from the Customer.io service file, version 1.0.0.

## Give your agent Customer.io today.

[Connect Customer.io free](https://actionlake.com/console?start=sandbox) [See pricing](https://actionlake.com/pricing)

Start free - 100,000 calls/month, no card. No signup. Hard caps on every key. Cached answers are free.

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Source: https://actionlake.com/connectors/customer-io
More: https://actionlake.com/llms.txt