# Usefulapi Mailerlite MCP server

Source: https://glimind.com/server/mcp-registry%2Fio.usefulapi%2Fmailerlite
Registry id: `mcp-registry/io.usefulapi/mailerlite`
Status: auth-required (checked 2026-10-27T03:31:44.957Z)

## Verdict

Usefulapi Mailerlite MCP server answered 100% of Glimind's liveness checks over 30 days, better than 42% of MCP servers, with 62 ms median handshake and 0 outages in 90 days. Its agent-readiness grade is A (96/100) across 13 tools, costing an agent about 2,036 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 100% | 42% of MCP servers |
| Median handshake latency | 62 ms | 88% of MCP servers |
| p95 handshake latency | 303 ms | — |
| Checks in 30 days | 216 | — |
| Outages, 90 days | 0 | — |
| Median recovery | — | — |
| Agent-readiness score | 96/100 (A) | 82% of MCP servers |
| Tools | 13 | — |
| Tool-list size for an agent | ~2,036 tokens | 52% of MCP servers |
| Days observed | 28 | — |

## Install

```json
{
  "mcpServers": {
    "usefulapi-mailerlite-mcp-server": {
      "type": "http",
      "url": "https://mailerlite.usefulapi.io/mcp"
    }
  }
}
```

Claude Code:

```sh
claude mcp add --transport http usefulapi-mailerlite-mcp-server https://mailerlite.usefulapi.io/mcp
```

## Tools (13)

- `mailerlite_assign_subscriber_to_group`: Adds a subscriber to a group (additive membership). MailerLite API: POST /subscribers/{subscriber_id}/groups/{group_id}.
- `mailerlite_create_group`: Creates a subscriber group/list (additive). MailerLite API: POST /groups.
- `mailerlite_get_campaign`: Fetch a single campaign by id. Read-only. MailerLite API: GET /campaigns/{campaign_id}.
- `mailerlite_get_subscriber`: Fetch a single subscriber by id or email address. MailerLite API: GET /subscribers/{id}.
- `mailerlite_list_automations`: List automations (workflows), optionally filtered by enabled state. Page-paginated. MailerLite API: GET /automations.
- `mailerlite_list_campaigns`: List campaigns, optionally filtered by status. Page-paginated. Read-only — this server does NOT send campaigns. MailerLite API: GET /campaigns.
- `mailerlite_list_fields`: List custom/default subscriber fields, optionally filtered by type or keyword. Page-paginated. MailerLite API: GET /fields.
- `mailerlite_list_group_subscribers`: List the subscribers belonging to a group, optionally filtered by status. Cursor-paginated. MailerLite API: GET /groups/{group_id}/subscribers.
- `mailerlite_list_groups`: List subscriber groups/lists, optionally filtered by name. Page-paginated. MailerLite API: GET /groups.
- `mailerlite_list_segments`: List segments. Page-paginated. MailerLite API: GET /segments.
- `mailerlite_list_subscribers`: List subscribers, optionally filtered by status. Cursor-paginated. MailerLite API: GET /subscribers.
- `mailerlite_list_webhooks`: List configured webhooks. Page-paginated. MailerLite API: GET /webhooks.
- `mailerlite_upsert_subscriber`: Creates or updates a subscriber (upsert by email). Additive — does NOT send any email. MailerLite API: POST /subscribers.

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.