Manage Loops contacts, mailing lists, and transactional/event emails. Hosted by usefulapi — connect from Claude, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"loops": {
"url": "https://loops.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"loops": {
"type": "http",
"url": "https://loops.usefulapi.io/mcp"
}
}
}Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see Before you connect.
The login page asks for your Loops API key.
Find it in Loops → Settings → API. Your key is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.
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: the login page asks for your Loops API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Turn on the Loops connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
loops_test_api_key | read | Test API key Verify the configured Loops API key and return the team name — a good first call. Loops API: GET /v1/api-key. |
loops_find_contact | read | Find a contact Find a contact by email or userId (supply at least one). Loops API: GET /v1/contacts/find. |
loops_list_contact_properties | read | List contact properties List contact fields / custom properties defined in Loops. Loops API: GET /v1/contacts/properties. |
loops_list_mailing_lists | read | List mailing lists List all mailing lists in the Loops account (id + name). Loops API: GET /v1/lists. |
loops_create_contact | write | Create a contact Creates a contact in Loops (additive). Loops API: POST /v1/contacts/create. |
loops_update_contact | write | Update a contact Updates (or creates) a contact by email/userId. Upserts — creates the contact if not found. Loops API: PUT /v1/contacts/update. |
loops_delete_contact | write | Delete a contact Deletes a contact from Loops. Destructive. Supply email OR userId. Loops API: POST /v1/contacts/delete. |
loops_create_contact_property | write | Create a contact property Creates a custom contact property/field (additive schema change). Loops API: POST /v1/contacts/properties. |
loops_send_event | write | 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. |
loops_send_transactional | write | 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. |
loops_usage_status | Usage status (free-tier meter) Report the caller's current free-tier usage this month: calls used, monthly limit, remaining, and whether the cap is reached. Read-only; does not count against the meter. | |
loops_request_feature | Request a missing feature Tell usefulapi that the user needs something the Loops tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. | |
loops_upgrade | Upgrade to Pro (unlimited) Subscribe to the Pro plan for UNLIMITED Loops tool calls (the free tier caps monthly usage). Choose monthly ($9/month) or yearly ($90/year — 2 months free) billing. Returns a Stripe Checkout link to open in your browser; after payment your account upgrades automatically. Does not count against the meter. | |
loops_cancel_subscription | Cancel the Pro subscription Cancel the caller's Loops Pro subscription at the end of the paid period (no refund for the current period; unlimited calls continue until then, then the free tier applies). Requires confirm: true. Run loops_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 100 tool calls / month |
| Pro | $9/mo · $90/yr | Unlimited |
Pro covers this Loops 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].
No. usefulapi is an independent service. It is not affiliated with or endorsed by Loops. The server calls the Loops API with your own Loops access, so it sees only the data that your account can see.
The login page asks for your Loops API key. See Before you connect for where to find it.
No. 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: the login page asks for your Loops API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Loops API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Loops.
Yes, if you approve it. 6 of the 10 Loops tools can create or change data. The other 4 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 100 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls, for this Loops server only. Run loops_usage_status to see how many calls you used.
Ask the AI to run loops_upgrade: it returns a Stripe Checkout link. To cancel, run loops_cancel_subscription. Pro continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with loops_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.