# io.usefulapi/mailerlite (remote · mailerlite.usefulapi.io)

Read subscribers, groups, campaigns, fields, segments, automations, webhooks; safe additive writes.

- Trust score: 74/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `mailerlite.usefulapi.io`: 74/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite.md), [page](https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite)

## Channel facts

- Endpoint: `https://mailerlite.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS not yet verified: we couldn't determine whether a plaintext access path exists.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 81/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1021 tokens (~78/item across 13 items; 13 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

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

### Codex

```toml
[mcp_servers.io-usefulapi-mailerlite]
url = "https://mailerlite.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-mailerlite": {
      "type": "remote",
      "url": "https://mailerlite.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-mailerlite --url https://mailerlite.usefulapi.io/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-mailerlite:
    url: "https://mailerlite.usefulapi.io/mcp"
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 72, +2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 70, −2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 71, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-07-27 (score 70, +58)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 12)

First indexed and scored.

## MCP tools (13)

### `mailerlite_list_subscribers` (~100 tokens)

List subscribers

List subscribers, optionally filtered by status. Cursor-paginated. MailerLite API: GET /subscribers.

Input parameters:

- `cursor` (string): Pagination cursor from a previous response's meta.next_cursor.
- `limit` (integer): Max subscribers to return per page (default 25, max 100).
- `status` (string): Filter by status (→ filter[status]): active | unsubscribed | unconfirmed | bounced | junk.

### `mailerlite_get_subscriber` (~46 tokens)

Get subscriber

Fetch a single subscriber by id or email address. MailerLite API: GET /subscribers/{id}.

Input parameters:

- `id` (string, required): Subscriber id OR email address.

### `mailerlite_list_groups` (~100 tokens)

List groups

List subscriber groups/lists, optionally filtered by name. Page-paginated. MailerLite API: GET /groups.

Input parameters:

- `limit` (integer): Max groups per page (default 25).
- `name` (string): Filter by name (→ filter[name]).
- `page` (integer): Page number (page-based pagination).
- `sort` (string): Sort field, e.g. name, total, -total, created_at.

### `mailerlite_list_group_subscribers` (~107 tokens)

List group subscribers

List the subscribers belonging to a group, optionally filtered by status. Cursor-paginated. MailerLite API: GET /groups/{group_id}/subscribers.

Input parameters:

- `cursor` (string): Pagination cursor from a previous response's meta.next_cursor.
- `group_id` (string, required): Group id.
- `limit` (integer): Max subscribers per page (default 25, max 100).
- `status` (string): Filter by status (→ filter[status]).

### `mailerlite_list_campaigns` (~94 tokens)

List campaigns

List campaigns, optionally filtered by status. Page-paginated. Read-only — this server does NOT send campaigns. MailerLite API: GET /campaigns.

Input parameters:

- `limit` (integer): Max campaigns per page (default 25).
- `page` (integer): Page number (page-based pagination).
- `status` (string): Filter by status (→ filter[status]): sent | draft | ready.

### `mailerlite_get_campaign` (~44 tokens)

Get campaign

Fetch a single campaign by id. Read-only. MailerLite API: GET /campaigns/{campaign_id}.

Input parameters:

- `campaign_id` (string, required): Campaign id.

### `mailerlite_list_fields` (~102 tokens)

List fields

List custom/default subscriber fields, optionally filtered by type or keyword. Page-paginated. MailerLite API: GET /fields.

Input parameters:

- `keyword` (string): Filter by keyword (→ filter[keyword]).
- `limit` (integer): Max fields per page (default 25).
- `page` (integer): Page number (page-based pagination).
- `type` (string): Filter by field type (→ filter[type]): text | number | date.

### `mailerlite_list_segments` (~56 tokens)

List segments

List segments. Page-paginated. MailerLite API: GET /segments.

Input parameters:

- `limit` (integer): Max segments per page (default 25).
- `page` (integer): Page number (page-based pagination).

### `mailerlite_list_automations` (~87 tokens)

List automations

List automations (workflows), optionally filtered by enabled state. Page-paginated. MailerLite API: GET /automations.

Input parameters:

- `filter_enabled` (boolean): Filter by enabled state (→ filter[enabled]).
- `limit` (integer): Max automations per page (default 25).
- `page` (integer): Page number (page-based pagination).

### `mailerlite_list_webhooks` (~61 tokens)

List webhooks

List configured webhooks. Page-paginated. MailerLite API: GET /webhooks.

Input parameters:

- `limit` (integer): Max webhooks per page (default 25).
- `page` (integer): Page number (page-based pagination).

### `mailerlite_upsert_subscriber` (~120 tokens)

Upsert subscriber

Creates or updates a subscriber (upsert by email). Additive — does NOT send any email. MailerLite API: POST /subscribers.

Input parameters:

- `email` (string, required): Subscriber email address (upsert key).
- `fields` (object): Custom/default field values keyed by field key, e.g. { name, last_name, company }.
- `groups` (array): Group id strings to add the subscriber to.
- `status` (string): Subscriber status: active | unsubscribed | unconfirmed | bounced | junk.

### `mailerlite_create_group` (~41 tokens)

Create group

Creates a subscriber group/list (additive). MailerLite API: POST /groups.

Input parameters:

- `name` (string, required): Name of the new group.

### `mailerlite_assign_subscriber_to_group` (~63 tokens)

Assign subscriber to group

Adds a subscriber to a group (additive membership). MailerLite API: POST /subscribers/{subscriber_id}/groups/{group_id}.

Input parameters:

- `group_id` (string, required): Group id.
- `subscriber_id` (string, required): Subscriber id.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite#diagnostics

## Score history

- 2026-08-03: 74
- 2026-08-02: 73
- 2026-08-01: 73
- 2026-07-31: 72
- 2026-07-30: 70
- 2026-07-29: 72
- 2026-07-28: 71
- 2026-07-27: 70
- 2026-07-26: 12

## Links

- Remote endpoint: https://mailerlite.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite/changelog.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-mailerlite/mailerlite