Loops MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.36.4Updated Nov 7, 2026

Manage Loops contacts, mailing lists, and transactional/event emails.

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableCommunication & CollaborationBusiness & Commerce

Overview

AI-generated overview

Hosted MCP server for Loops: look up, create, update and delete contacts, list mailing lists and properties, and send events or transactional emails.

What you can do
  • Verify the API key and check the team it belongs to
  • Find contacts by email or userId, and list mailing lists and custom contact properties
  • Create, update (upsert) or delete contacts, and create custom contact properties
  • Send events that trigger Loops automations, and send real transactional emails from a template
  • Check monthly usage, request a feature, and manage the Pro subscription
When to use it
Useful when an assistant should work with a Loops email-marketing account: answering questions about contacts and lists, keeping contact records current, or triggering Loops automations and transactional emails from a conversation.
Requirements
Remote streamable HTTP endpoint; no local install. Connect with the URL only and sign in via OAuth, pasting a Loops API key on first connect, which is validated and stored per user. A Loops account is required; the free plan allows 50 tool calls per month.
Before you install
Write tools change real data: contacts can be created, upserted or deleted, and properties added. Sending an event triggers any automations subscribed to it, and the transactional tool dispatches an actual email to the recipient. The server also exposes paid plans with Stripe Checkout links and a cancel tool, so an assistant could start a subscription; confirm before any write, send or billing action. Your Loops API key is stored by the third-party host.

Installation

In SourceWeft

  1. Open Loops MCP by usefulapi in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

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%2Floops/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.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "loops-by-usefulapi": {
      "type": "http",
      "url": "https://loops.usefulapi.io/mcp"
    }
  }
}

README

Loops MCP by usefulapi

Manage Loops contacts, mailing lists, and transactional & event emails from Claude, Cursor, or any MCP client. Hosted, no local install — connect with your Loops API key.

Live endpoint: https://loops.usefulapi.io/mcp · Homepage: https://usefulapi.io/loops

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://loops.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http loops https://loops.usefulapi.io/mcp, then run /mcp to log in.
  • VS Code: Add to VS Code.
  • Cursor and other clients: add the URL as a remote MCP server:
json
{  "mcpServers": {    "loops": {      "url": "https://loops.usefulapi.io/mcp"    }  }}

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 Loops credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/loops/

On first connect you'll paste your Loops API key. It's validated, stored per-user, and scoped to you.

Tools

ToolTypeWhat it does
loops_test_api_keyreadTest API key
loops_find_contactreadFind a contact
loops_list_contact_propertiesreadList contact properties
loops_list_mailing_listsreadList mailing lists
loops_create_contactwriteCreate a contact
loops_update_contactwriteUpdate a contact
loops_delete_contactwriteDelete a contact
loops_create_contact_propertywriteCreate a contact property
loops_send_eventwriteSend an event
loops_send_transactionalwriteSend a transactional email
loops_usage_statusmetaUsage status (free-tier meter)
loops_request_featuremetaRequest a missing feature
loops_upgrademetaUpgrade to Pro or Pro+
loops_cancel_subscriptionmetaCancel the Pro subscription

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.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Pro$9/mo or $90/yr (2 months free)Unlimited*

*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 loops_upgrade (it returns a Stripe Checkout link). Cancel any time with loops_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running loops_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.

Source: servers/loops/README.md at commit 4046075

Tools

10

loops_test_api_key

Test API key

Verify the configured Loops API key and return the team name — a good first call. Loops API: GET /v1/api-key.

Takes no parameters.

loops_find_contact

Find a contact

Find a contact by email or userId (supply at least one). Loops API: GET /v1/contacts/find.

ParametersemailuserId

loops_list_contact_properties

List contact properties

List contact fields / custom properties defined in Loops. Loops API: GET /v1/contacts/properties.

Parameterslist

loops_list_mailing_lists

List mailing lists

List all mailing lists in the Loops account (id + name). Loops API: GET /v1/lists.

Takes no parameters.

loops_create_contact

Create a contact

Creates a contact in Loops (additive). Loops API: POST /v1/contacts/create.

ParametersemailrequiredsourceuserIdlastNamefirstNameuserGrouppropertiessubscribedmailingLists

loops_update_contact

Update a contact

Updates (or creates) a contact by email/userId. Upserts — creates the contact if not found. Loops API: PUT /v1/contacts/update.

ParametersemailrequiredsourceuserIdlastNamefirstNameuserGrouppropertiessubscribedmailingLists

loops_delete_contact

Delete a contact

Deletes a contact from Loops. Destructive. Supply email OR userId. Loops API: POST /v1/contacts/delete.

ParametersemailuserId

loops_create_contact_property

Create a contact property

Creates a custom contact property/field (additive schema change). Loops API: POST /v1/contacts/properties.

Parametersnamerequiredtyperequired

loops_send_event

Send an event

Sends an event to Loops for a contact — TRIGGERS any automations/loops subscribed to this event. Loops API: POST /v1/events/send.

ParametersemailuserIdeventNamerequiredmailingListseventPropertiescontactProperties

loops_send_transactional

Send a transactional email

SENDS a real transactional email via a Loops template. This dispatches an actual email to the recipient. Loops API: POST /v1/transactional.

ParametersemailrequiredattachmentsaddToAudiencedataVariablestransactionalIdrequired

Version history

21
  1. v1.36.4LatestNov 7, 2026
  2. v1.35.3Nov 5, 2026
  3. v1.35.2Nov 5, 2026
  4. v1.35.1Nov 4, 2026
  5. v1.35.0Nov 3, 2026
  6. v1.34.1Nov 3, 2026
  7. v1.33.0Nov 1, 2026
  8. v1.31.0Oct 31, 2026
  9. v1.30.0Oct 31, 2026
  10. v1.29.2Oct 30, 2026
  11. v1.29.0Oct 30, 2026
  12. v1.24.0Oct 26, 2026
  13. v1.21.3Oct 25, 2026
  14. v1.21.0Oct 25, 2026
  15. v1.20.0Oct 24, 2026
  16. v1.17.0Oct 23, 2026
  17. v1.16.4Oct 22, 2026
  18. v1.16.3Oct 21, 2026
  19. v1.11.1Oct 9, 2026
  20. v1.10.0Oct 9, 2026
  21. v1.0.1Sep 16, 2026

Score

100% 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.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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