Sarbacane MCP by usefulapi
REMOTE · SARBACANE.USEFULAPI.IO
Read Sarbacane campaigns, stats, lists and blacklists; manage contacts and draft email campaigns.
Available components
Last scanned (1 hour ago)
Scores higher than 4% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Marketing and SEO
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 → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not yet verified: we couldn't confirm whether this endpoint requires it. View diagnostics → Unverified
- HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven. 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
Transport & Reachability0
- Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly. See how to fix → View diagnostics → Fail
Schema Quality & AI Usability0
- Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list.Unverified
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage0
- Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.Unverified
Tool Safety0
- Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.Unverified
Capabilities0
- Capabilities not yet verified: we couldn't read the endpoint's capabilities.Unverified
Unverified: 5 categories
Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.
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.
- 2 Nov 26 −50
- Endpoint reachability: reachable → not serving MCP ▼ security
- Stability: 0.23 → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Authorization: pass → unverified ▼ security
- Schema quality: 100 → unverified ▼ functional
- Capabilities: pass → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- 31 Oct 26 +3
- Authorization: partial → pass ▲ security
- MCP protocol: fail → pass ▲ functional
- New prompt “add_or_update_contacts_or_record_an_unsubscribe” functional
- New prompt “check_how_a_campaign_performed” functional
- New prompt “check_your_remaining_credits” functional
- New prompt “look_at_contact_lists_and_their_fields” functional
- New prompt “prepare_a_draft_email_campaign” functional
- New prompt “review_bounces_unsubscribers_and_complaints” functional
- MCP protocol version: 2025-06-18 → 2025-11-25 functional
- Server version: 1.9.0 → 1.11.0 functional
- Server version: 1.8.0 → 1.9.0 functional
- Server version: 1.7.2 → 1.8.0 functional
- 30 Oct 26 +1
- Server version: 1.7.1 → 1.7.2 functional
- Server version: 1.7.0 → 1.7.1 functional
- 29 Oct 26 0
- Server version: 1.6.0 → 1.7.0 functional
- Server version: 1.5.0 → 1.6.0 functional
- 28 Oct 26 +1
- Server version: 1.3.0 → 1.5.0 functional
- 27 Oct 26 0
- Server version: 1.2.0 → 1.3.0 functional
- 26 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 25 Oct 26 62
First indexed and scored.
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 5 Nov 2026 · Probed https://sarbacane.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 | 13 Sept 2026 | 12 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d9be3287b0fde9630e825ba1f79bff3f |
| SANs: usefulapi.io, *.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 |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of sarbacane.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 38690 | 8 | Verified |
| usefulapi.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Inconclusive
We could not reach the endpoint well enough to judge its authorisation posture.
| Result | Inconclusive |
|---|---|
| HTTP status | 302 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://sarbacane.usefulapi.io/mcp | Redirected | 302 | https://usefulapi.io/sarbacane/ |
| http (plaintext) | http://sarbacane.usefulapi.io/mcp | Inconclusive | 302 | http://sarbacane.usefulapi.io/mcp |
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. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
sarbacane_add_unsubscriber Add an unsubscribed contact to a blacklist ~83
WRITE: record an email and/or phone as unsubscribed in a blacklist, so campaigns using that blacklist skip it. Cannot be undone with these tools. POST /v1/blacklists/{blacklistId}/unsubscribers.
| Name | Type | Req | Description |
|---|---|---|---|
| blacklist_id | string | yes | Blacklist id. |
| string | – | – | |
| phone | string | – | – |
No output schema declared.
No examples provided.
sarbacane_create_contact Add a contact to a list ~121
WRITE: add a contact to a contact list. Give an email, a phone number or both, and optional custom field values. Adds a new record; use sarbacane_upsert_contact to update an existing contact. POST /v1/lists/{listId}/contacts.
| Name | Type | Req | Description |
|---|---|---|---|
| string | – | – | |
| fields | object | – | Custom field values as { <custom field id>: value }. Get the ids from sarbacane_list_list_fields. |
| list_id | string | yes | Contact list id. |
| phone | string | – | – |
No output schema declared.
No examples provided.
sarbacane_create_email_campaign Create an email campaign (draft) ~164
WRITE: create a new email campaign as a DRAFT. It is never sent by these tools: add content (sarbacane_set_campaign_content or sarbacane_import_campaign_template) and a contact list (sarbacane_set_campaign_list), then send it from Sarbacane. POST /v1/campaigns/email.
| Name | Type | Req | Description |
|---|---|---|---|
| alias_from | string | yes | Sender name. |
| alias_reply_to | string | yes | Reply-to name. |
| email_from | string | yes | Sender email address (must be a sender allowed on the account). |
| email_reply_to | string | yes | Reply-to email address. |
| name | string | yes | Campaign name (internal). |
| preheader | string | – | Preheader text. |
| subject | string | yes | Email subject. |
No output schema declared.
No examples provided.
sarbacane_get_campaign Get campaign details ~57
One campaign: state, kind, blacklists, send ids, sent date. The send id is needed to see content. GET /v1/campaigns/{campaignId}.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
No output schema declared.
No examples provided.
sarbacane_get_campaign_report Get campaign statistics ~60
Statistics of a campaign per send: delivered count, opens, openers, clicks, clickers, unsubscribers, devices and operating systems. GET /v1/reports/{campaignId}.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
No output schema declared.
No examples provided.
sarbacane_get_credits Get remaining credits ~46
The account's remaining credits per type (email campaigns, SMS, eye tracking, Sendkit emails) with expiry date and subscription type. GET /v1/credits.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
sarbacane_import_campaign_template Import a template into a draft campaign ~67
WRITE: load a saved template's content into an email campaign, replacing its content. POST /v1/campaigns/{campaignId}/content.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
| template_id | string | yes | Template id (from Sarbacane). |
No output schema declared.
No examples provided.
sarbacane_list_blacklist_entries List blacklist entries ~202
Entries of a blacklist by kind: bounces (invalid addresses), unsubscribers or complaints (personal data: email, phone). Filter by email, phone or modification date. GET /v1/blacklists/{blacklistId}/{bounces|unsubscribers|complaints}.
| Name | Type | Req | Description |
|---|---|---|---|
| blacklist_id | string | yes | Blacklist id (sarbacane_list_blacklists). |
| string | – | Only this email. | |
| kind | string | yes | Which entries: bounces, unsubscribers or complaints. |
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| modified_after | string | – | Only entries modified at or after this time. |
| modified_before | string | – | Only entries modified at or before this time. |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
| phone | string | – | Only this phone number. |
No output schema declared.
No examples provided.
sarbacane_list_blacklists List blacklists ~81
All blacklists (suppression lists) of the account, with their ids. GET /v1/blacklists.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
No output schema declared.
No examples provided.
sarbacane_list_campaign_recipients List a campaign's recipients ~97
Recipients attached to a campaign (personal data: email, phone). GET /v1/campaigns/{campaignId}/recipients.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
No output schema declared.
No examples provided.
sarbacane_list_campaigns List campaigns ~122
Campaigns of the account (id, name, kind, created/edited, recipient count). Filter by state or a text in the name or subject. GET /v1/campaigns.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
| search | string | – | Text in the campaign name or subject. |
| state | string | – | Only campaigns in this state. |
No output schema declared.
No examples provided.
sarbacane_list_contacts List contacts in a list ~186
Contacts of one list (personal data: email, phone, custom fields). Filter by email, phone, a text search across fields, or the modification date. GET /v1/lists/{listId}/contacts.
| Name | Type | Req | Description |
|---|---|---|---|
| string | – | Only the contact with this email. | |
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| list_id | string | yes | Contact list id. |
| modified_after | string | – | Only contacts modified at or after this time. |
| modified_before | string | – | Only contacts modified at or before this time. |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
| phone | string | – | Only the contact with this phone number. |
| search | string | – | Text to look for in the contact's fields. |
No output schema declared.
No examples provided.
sarbacane_list_list_fields List a list's custom fields ~76
The custom fields (columns) of a contact list: id, caption and type (STRING, BOOL, INT, DATE). Field ids are the keys used when writing contacts. GET /v1/lists/{listId}/fields.
| Name | Type | Req | Description |
|---|---|---|---|
| list_id | string | yes | Contact list id (sarbacane_list_lists). |
No output schema declared.
No examples provided.
sarbacane_list_lists List contact lists ~84
All contact lists of the account, with their ids. Use the ids for contacts, fields and campaigns. GET /v1/lists.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
No output schema declared.
No examples provided.
sarbacane_list_users List account users ~94
Users and pending invitations of the Sarbacane account (name, email, role, team). GET /v1/users.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum items returned, 1-1000 (default 50). |
| offset | integer | – | Starting position, from 0 (default 0). Pass the previous reply's next_offset. |
| search | string | – | Filter users by name or email. |
No output schema declared.
No examples provided.
sarbacane_list_webhooks List webhooks ~35
Webhook subscriptions of the account: url, display name and subscribed event kinds. GET /v1/webhooks.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
sarbacane_set_campaign_content Set a draft campaign's content ~137
WRITE: set the HTML (and optional plain-text) content of an email campaign's send, replacing what was there. Without send_id the campaign's only send is used (an A/B test campaign has several: pass one). POST /v1/campaigns/{campaignId}/send/{sendId}/content.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
| html | string | yes | The HTML body of the email. |
| send_id | string | – | Send id from sarbacane_get_campaign (campaign.sends). Optional when the campaign has one send. |
| text | string | – | Plain-text alternative. |
No output schema declared.
No examples provided.
sarbacane_set_campaign_list Attach a contact list to a draft campaign ~74
WRITE: import a contact list's contacts as the recipients of a campaign. It does not send the campaign. POST /v1/campaigns/{campaignId}/list.
| Name | Type | Req | Description |
|---|---|---|---|
| campaign_id | string | yes | Campaign id. |
| list_id | string | yes | Contact list id (sarbacane_list_lists). |
No output schema declared.
No examples provided.
sarbacane_upsert_contact Add or update a contact ~108
WRITE: add a contact to a list, or update it when the same email/phone pair already exists (custom field values are overwritten). POST /v1/lists/{listId}/contacts/upsert.
| Name | Type | Req | Description |
|---|---|---|---|
| string | – | – | |
| fields | object | – | Custom field values as { <custom field id>: value }. Get the ids from sarbacane_list_list_fields. |
| list_id | string | yes | Contact list id. |
| phone | string | – | – |
No output schema declared.
No examples provided.
How do I install the Sarbacane MCP by usefulapi server?
Sarbacane MCP by usefulapi is a hosted endpoint at https://sarbacane.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · sarbacane.usefulapi.io
claude mcp add --transport http io-usefulapi-sarbacane 'https://sarbacane.usefulapi.io/mcp'
What is the Sarbacane MCP by usefulapi server?
Sarbacane MCP by usefulapi is listed in the public MCP registry as io.usefulapi/sarbacane. Read Sarbacane campaigns, stats, lists and blacklists; manage contacts and draft email campaigns. This page covers its hosted endpoint (https://sarbacane.usefulapi.io/mcp).
Is the Sarbacane MCP by usefulapi server safe to use?
Sarbacane MCP by usefulapi scores 18 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Sarbacane MCP by usefulapi server expose?
Sarbacane MCP by usefulapi exposes 19 tools: sarbacane_get_credits, sarbacane_list_users, sarbacane_list_lists, sarbacane_list_list_fields, sarbacane_list_contacts, and 14 more. Their descriptions and schemas cost roughly 1,894 tokens of context every time the server is loaded.
Does the Sarbacane MCP by usefulapi server require authentication?
Its publisher declares no required credentials for Sarbacane MCP by usefulapi. We have not been able to confirm that against the live endpoint, and a server can require authorisation without declaring it here.
Is the Sarbacane MCP by usefulapi server still maintained?
Sarbacane MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.