Retainful MCP by usefulapi
List contacts and lists; create contacts, add them to lists and record events in Retainful.
What it does
Retainful MCP by usefulapi is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 4h ago (live check)Hosted endpoint
https://retainful.usefulapi.io/mcpstreamable-http
In Claude Code: claude mcp add --transport http retainful-mcp-by-usefulapi https://retainful.usefulapi.io/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"retainful-mcp-by-usefulapi": {
"url": "https://retainful.usefulapi.io/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 4h agoONLINE Retainful MCP by usefulapi answered an MCP connection on 02 Nov 2026 and introduced itself as retainful-mcp 1.0.0 (MCP protocol 2025-06-18).
7 tools offered to AI assistants
retainful_list_contacts· List contacts (profiles) in the Retainful organization, one page at a time, with consent status and source. Retainful API: GET /customer.retainful_get_contact· Get one contact (profile) by its Retainful id (contactUUID), with its attributes. Retainful API: GET /customer/{id}.retainful_list_lists· List the lists and segments in the organization with their ids. Use the id as list_id in retainful_add_contact_to_list. Retainful API: GET /contact-groups.retainful_get_list· Get one list or segment by its id. Retainful API: GET /contact-groups/{id}.retainful_upsert_contact· WRITE: create a contact, or update it when the email or phone already exists. Does not add anyone to a list. email_opt_in is required: it sets marketing consent, so send SUBSCRIBED only with real consent. Needs email or phone. Retainful APIretainful_add_contact_to_list· WRITE: create or update a contact by email and add them to a list in one call. A list can start an automation. email_opt_in is required: an existing contact is set to SUBSCRIBED when it is omitted here. Retainful API: POST /contact-groups/{retainful_track_event· WRITE: record one event on a contact's timeline. Automations triggered by the event can email the contact. Reuse the same unique_identifier only for a retry of the same real occurrence (a repeat does not trigger automations again); use a ne
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://retainful.usefulapi.io/mcp | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Website | https://usefulapi.io/retainful/ | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Repository | https://github.com/m190/usefulapi-mcp | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| Version | 1.0.0 | DECLARED | SRC-001 Official MCP Registry | 4h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 4h ago |
Change history
- NEW02 Nov 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is Retainful MCP by usefulapi still online?
Free alerts · no account▲ 0Do you run Retainful MCP by usefulapi? Know when it stops answering
For publishers · optionalIts hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.
Monitoring never changes a score or a rank.
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<a href="https://electraindex.com/mcp/retainful-mcp-by-usefulapi?utm_source=badge&utm_medium=share&utm_campaign=listing"><img src="https://electraindex.com/api/badge/retainful-mcp-by-usefulapi" alt="Listed on Electra Index"></a>Questions about Retainful MCP by usefulapi
How do I connect Retainful MCP by usefulapi?
Use the hosted endpoint https://retainful.usefulapi.io/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does Retainful MCP by usefulapi offer?
When Electra Index connected on 02 Nov 2026, it listed 7 tools: retainful_list_contacts, retainful_get_contact, retainful_list_lists, retainful_get_list, retainful_upsert_contact, retainful_add_contact_to_list, retainful_track_event. The full list is in "Live check" above.
Is Retainful MCP by usefulapi online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 4h ago.