io.usefulapi/mailerlite

REMOTE · MAILERLITE.USEFULAPI.IO · SCANNED AUG 3

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

Available components

+4 this week 74 74 Trust /100

Trust breakdown (6 categories)

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. How we score →

Endpoint Security78

The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
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. View diagnostics → Pass
HTTPS not yet verified: we couldn't determine whether a plaintext access path exists. View diagnostics → Unverified
HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial

Transport & Reachability100

Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass

Schema Quality & AI Usability81

AI-judged instruction clarity (excellent).Pass
Tool/resource definitions use about 1021 tokens (~78/item across 13 items; 13 tools + 0 resources), lean.Pass
Usage-examples check failed: none of the tools include examples. See how to fix → Fail

Stability & Change Management23

Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial

Tool Coverage100

100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
100% of tool parameters carry a description.Pass

Capabilities60

Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail

Install

Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.

remote · mailerlite.usefulapi.io

Claude Codex opencode OpenClaw Hermes Other

# add to Claude Code

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

# ~/.codex/config.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
    }
  }
}

# add to OpenClaw

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

# ~/.hermes/config.yaml

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

// mcp.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 we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

3 Aug 26 +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.
1 Aug 26 +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.
31 Jul 26 +2
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
30 Jul 26 −2
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
29 Jul 26 +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.
28 Jul 26 +1
- Stability: unverified → 0.03 ▲ functional
27 Jul 26 +58
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
26 Jul 26 12

First indexed and scored.

Show 7 earlier entries Hide earlier entries

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 3 Aug 2026 · Probed https://mailerlite.usefulapi.io/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject	Issuer	Valid from	Valid until	Key	Signature	Serial
CN=usefulapi.io	CN=WE1,O=Google Trust Services,C=US	16 Jul 2026	14 Oct 2026	ECDSA 256	ECDSA-SHA256	a6da685b16bc938c130b29a57da80603
SANs: usefulapi.io, mailerlite.usefulapi.io, *.mailerlite.usefulapi.io
CN=WE1,O=Google Trust Services,C=US (CA)	CN=GTS Root R4,O=Google Trust Services LLC,C=US	13 Dec 2023	20 Feb 2029	ECDSA 256	ECDSA-SHA384	7ff31977972c224a76155d13b6d685e3
CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA)	CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE	15 Nov 2023	28 Jan 2028	ECDSA 384	SHA256-RSA	7fe530bf331343bedd821610493d8a1b

DNSSEC insecure

Validation of mailerlite.usefulapi.io. — Not signed

Zone	DS	Keys	Algorithms	Outcome
.	trust_anchor	20326, 38696	8, 8	Verified
io.	present	57355	8	Verified
usefulapi.io.	absent			Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation

Authentication Enforced and verified

The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.

Result	Enforced and verified
Enforced	On tool calls
HTTP status	200

WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://mailerlite.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"

Bearer realm="OAuth", resource_metadata="https://mailerlite.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"

Protected resource metadata

Document	https://mailerlite.usefulapi.io/.well-known/oauth-protected-resource/mcp
Retrieved	Yes
Resource	https://mailerlite.usefulapi.io/mcp
Authorisation server	https://mailerlite.usefulapi.io

Transports 2 probes

Transport	URL	Outcome	Status	Location
streamable-http	https://mailerlite.usefulapi.io/mcp	Verified	200
http (plaintext)	http://mailerlite.usefulapi.io/mcp	Inconclusive	401

MCP tools — 13 exposed · ~1,021 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.

Tool Tokens

mailerlite_assign_subscriber_to_group Assign subscriber to group ~63

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

Input Output Examples

Name	Type	Req	Description
group_id	string	yes	Group id.
subscriber_id	string	yes	Subscriber id.

No output schema declared.

No examples provided.

mailerlite_create_group Create group ~41

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

Input Output Examples

Name	Type	Req	Description
name	string	yes	Name of the new group.

No output schema declared.

No examples provided.

mailerlite_get_campaign Get campaign ~44

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

Input Output Examples

Name	Type	Req	Description
campaign_id	string	yes	Campaign id.

No output schema declared.

No examples provided.

mailerlite_get_subscriber Get subscriber ~46

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

Input Output Examples

Name	Type	Req	Description
id	string	yes	Subscriber id OR email address.

No output schema declared.

No examples provided.

mailerlite_list_automations List automations ~87

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

Input Output Examples

Name	Type	Req	Description
filter_enabled	boolean	—	Filter by enabled state (→ filter[enabled]).
limit	integer	—	Max automations per page (default 25).
page	integer	—	Page number (page-based pagination).

No output schema declared.

No examples provided.

mailerlite_list_campaigns List campaigns ~94

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

Input Output Examples

Name	Type	Req	Description
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.

No output schema declared.

No examples provided.

mailerlite_list_fields List fields ~102

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

Input Output Examples

Name	Type	Req	Description
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.

No output schema declared.

No examples provided.

mailerlite_list_group_subscribers List group subscribers ~107

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

Input Output Examples

Name	Type	Req	Description
cursor	string	—	Pagination cursor from a previous response's meta.next_cursor.
group_id	string	yes	Group id.
limit	integer	—	Max subscribers per page (default 25, max 100).
status	string	—	Filter by status (→ filter[status]).

No output schema declared.

No examples provided.

mailerlite_list_groups List groups ~100

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

Input Output Examples

Name	Type	Req	Description
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.

No output schema declared.

No examples provided.

mailerlite_list_segments List segments ~56

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

Input Output Examples

Name	Type	Req	Description
limit	integer	—	Max segments per page (default 25).
page	integer	—	Page number (page-based pagination).

No output schema declared.

No examples provided.

mailerlite_list_subscribers List subscribers ~100

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

Input Output Examples

Name	Type	Req	Description
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.

No output schema declared.

No examples provided.

mailerlite_list_webhooks List webhooks ~61

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

Input Output Examples

Name	Type	Req	Description
limit	integer	—	Max webhooks per page (default 25).
page	integer	—	Page number (page-based pagination).

No output schema declared.

No examples provided.

mailerlite_upsert_subscriber Upsert subscriber ~120

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

Input Output Examples

Name	Type	Req	Description
email	string	yes	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.

No output schema declared.

No examples provided.

On this page

Handy links

Scoring key

80+ high trust
60–79 medium
below 60 low

How we score

Score history · last 30 days

26 Jul 3 Aug

Day	Score
26 Jul	12
27 Jul	70
28 Jul	71
29 Jul	72
30 Jul	70
31 Jul	72
1 Aug	73
2 Aug	73
3 Aug	74