usefulapi

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

Claude

Open Settings → Connectors → Add custom connector
Paste this URL:
https://loops.usefulapi.io/mcp
Authenticate with Loops when prompted

Cursor · VS Code · Windsurf · Cline

Add to your MCP config, then reload & authorize:

{
  "mcpServers": {
    "loops": {
      "url": "https://loops.usefulapi.io/mcp"
    }
  }
}

live12 toolsFree 100 tool calls / monthPro $9/mo · $90/yr

Tools 12

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`	meta	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_upgrade`	meta	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. Read-only; does not count against the meter.

Pricing

Plan	Price	Limit
Free	$0	100 tool calls / month
Pro	$9/mo · $90/yr	Unlimited

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.