io.usefulapiPublished by usefulapi.ioOfficial publisherv1.36.4Updated Nov 7, 2026
Query people, segments, campaigns, and message deliveries; send transactional email or broadcasts.
The publisher's own server: Ably MCP by usefulapi
Hosted Customer.io MCP server that lets an assistant query customers, segments, campaigns and message deliveries, and send transactional email or broadcasts.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.usefulapi%2Fcustomerio/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"customer-io-by-usefulapi": {
"type": "http",
"url": "https://customerio.usefulapi.io/mcp"
}
}
}Manage your Customer.io people, segments, campaigns, and messaging from Claude, Cursor, or any MCP client. Hosted, no local install — connect with your Customer.io API credentials.
Live endpoint: https://customerio.usefulapi.io/mcp · Homepage: https://usefulapi.io/customerio
https://customerio.usefulapi.io/mcp.claude mcp add --transport http customerio https://customerio.usefulapi.io/mcp, then run /mcp to log in.Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Customer.io credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/customerio/
On first connect you'll paste your Customer.io API key(s). It's validated, stored per-user, and scoped to you.
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this server only. Subscribe with customerio_upgrade (it returns a Stripe Checkout link). Cancel any time with customerio_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running customerio_upgrade before then undoes the cancel. Or write to [email protected].
MIT — see LICENSE. Documentation only; the server is hosted.
Source: servers/customerio/README.md at commit 4046075
Search customers
Search/list people by a Customer.io filter (segment or attribute conditions). e.g. filter={"segment":{"id":7}} or {"and":[...]}. App API: POST /v1/customers.
limitstartfilterrequiredGet customer attributes
Get a single person's attributes (profile fields). App API: GET /v1/customers/{customer_id}/attributes.
customer_idrequiredGet customer segments
List the segments a single person belongs to. App API: GET /v1/customers/{customer_id}/segments.
customer_idrequiredGet customer messages
List messages (deliveries) sent to a single person. App API: GET /v1/customers/{customer_id}/messages.
limitstartcustomer_idrequiredList segments
List all segments in the workspace (id + name + type). App API: GET /v1/segments.
Takes no parameters.
List campaigns
List all campaigns in the workspace. App API: GET /v1/campaigns.
Takes no parameters.
Get campaign
Get a single campaign by id. App API: GET /v1/campaigns/{campaign_id}.
campaign_idrequiredGet campaign metrics
Get delivery/engagement metrics for a campaign over time. App API: GET /v1/campaigns/{campaign_id}/metrics.
typestepsperiodcampaign_idrequiredList messages
List sent messages (deliveries) across the workspace, filterable by type/campaign/newsletter. App API: GET /v1/messages.
typelimitstartdraftscampaign_idnewsletter_idList exports
List data exports in the workspace. App API: GET /v1/exports.
Takes no parameters.
List collections
List reusable data collections in the workspace. App API: GET /v1/collections.
Takes no parameters.
Send transactional email
⚠️ SENDS A REAL EMAIL. Send a transactional email using a transactional message template. Delivers immediately to the `to` recipient. App API: POST /v1/send/email.
torequiredbodyfromsubjectidentifiersrequiredmessage_datasend_to_unsubscribedtransactional_message_idrequireddisable_message_retentionTrigger broadcast
⚠️ SENDS TO REAL RECIPIENTS. Trigger an API-triggered broadcast, delivering to the resolved recipient set. App API: POST /v1/send/broadcast (posts to /v1/campaigns/{broadcast_id}/triggers).
datarecipientsbroadcast_idrequiredid_ignore_missingemail_add_duplicatesemail_ignore_missing100% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
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{ "mcpServers": { "customerio": { "url": "https://customerio.usefulapi.io/mcp" } }}