MCP HeartbeatTHE MCP OBSERVATORY
Public workspace

Explore

Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Data access / search

Mailchimp MCP by usefulapi

By usefulapi.io Verified namespace

Read audiences, members, campaigns and reports; add, update, tag and archive subscribers.

WebsiteSource code
Connect to Mailchimp MCP by usefulapi
Checks passed
14 / 22

0 failed · 8 not measured

Median response
57 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
18

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Outdated check

Last connection measurement is over 24 hours old. Current availability is unknown.

Last checked
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
400
Publisher identityCan the publisher be traced to its source?
402

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 57 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name mailchimp-mcp.

  • Pass
    Lists tools

    tools/list returned 18 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 57 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 57 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Pass
    Parameters documented

    61 of 61 parameters have a description (100%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Pass
    Website matches publisher

    The website host matches the reverse-domain namespace.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Not measured
    Repo owner matches

    This namespace is not an io.github login, so the owner comparison does not apply.

  • Pass
    Recently updated

    Updated 2026-11-10T23:33:29.146582Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Start using Mailchimp MCP by usefulapi

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

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

Capabilities

Tools 18

mailchimp_add_member

Add a new member (subscriber) to an audience (list). Note: status "pending" triggers a double-opt-in confirmation email. REST: POST /lists/{list_id}/members.

Discovered
mailchimp_add_member_tags

Add and/or remove tags on an audience member (by email or subscriber_hash). `tags` are added (status active); `removeTags` are removed (status inactive). Mailchimp returns HTTP 204 (no body). REST: POST /lists/{list_id}/members/{subscriber_hash}/tags (email → MD5 hash).

Discovered
mailchimp_archive_member

Archive (soft-remove) an audience member — reversible; this is NOT the permanent-delete action. REST: DELETE /lists/{list_id}/members/{subscriber_hash} (email → MD5 hash). Returns HTTP 204 (no body).

Discovered
mailchimp_get_account

Get the API Root — the authenticated Mailchimp account: account name, total subscribers, contact info, plan and industry stats. REST: GET /.

Discovered
mailchimp_get_audience

Get a single audience (list) by id, including subscriber stats, default from-name/email and settings. REST: GET /lists/{list_id}.

Discovered
mailchimp_get_campaign

Get a single campaign by id, including its settings, recipients and send status. REST: GET /campaigns/{campaign_id}.

Discovered
mailchimp_get_campaign_report

Get the report for one campaign — opens, clicks, bounces, unsubscribes and other engagement summary stats. REST: GET /reports/{campaign_id}.

Discovered
mailchimp_get_member

Get a single audience member (subscriber) by email or subscriber_hash, including status, merge fields, tags and stats. REST: GET /lists/{list_id}/members/{subscriber_hash} (email → MD5 hash).

Discovered
mailchimp_list_audiences

List the account's audiences — Mailchimp's `/lists` resource (an audience is a list of subscribers). Paginated, with optional sort. REST: GET /lists.

Discovered
mailchimp_list_automations

List the account's classic automations (automated email workflows). Paginated. REST: GET /automations.

Discovered
mailchimp_list_campaigns

List the account's campaigns (email sends). Paginated, with optional type/status/audience filters and sort. REST: GET /campaigns.

Discovered
mailchimp_list_member_tags

List the tags applied to a single audience member (by email or subscriber_hash). Paginated. REST: GET /lists/{list_id}/members/{subscriber_hash}/tags (email → MD5 hash).

Discovered
mailchimp_list_members

List members of an audience (list). Paginated, with an optional status filter and sort. REST: GET /lists/{list_id}/members.

Discovered
mailchimp_list_reports

List campaign reports (aggregate performance for sent campaigns). Paginated, with an optional type filter. REST: GET /reports.

Discovered
mailchimp_list_segments

List an audience's segments and tags (saved segments include static tags). Paginated. REST: GET /lists/{list_id}/segments.

Discovered
mailchimp_list_templates

List the account's email templates (saved and pre-built layouts). Paginated, with optional type filter and sort. REST: GET /templates.

Discovered
mailchimp_search_members

Search for members across the account (or one audience) by email, name or other fields. Returns exact + full-text matches. REST: GET /search-members.

Discovered
mailchimp_update_member

Update an existing audience member (by email or subscriber_hash). Only the fields you supply change. REST: PATCH /lists/{list_id}/members/{subscriber_hash} (email → MD5 hash).

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 14 days.
CheckedResultResponseTools
Connected57 ms18

Related servers

All alternatives

Same function and industry, ranked by checks passed then median latency.

Explore alternatives to Mailchimp MCP by usefulapi