usefulapiRobly MCP server
Find Robly contacts and lists; subscribe, update and move contacts between lists. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the Robly connector, then ask in plain words. The AI picks the tools.
- Which contacts joined my Robly account this week, and which lists are they on?
- Is jane@example.com subscribed, and which lists is she on?
- Add john@example.com to the Newsletter list with the first name John.
- Create a list called Fall Webinar and put these three contacts on it.
What you can do with Robly in Claude and ChatGPT
For email marketers who manage subscribers and lists in Robly.
Check if a person is subscribed and on which lists
The AI finds a contact by email or member id and reads status, subscription date, sign-up source and lists, and checks membership of one list.
See who joined recently and on which lists
The AI lists contacts filtered by status, list or last-updated time, with the lists of each contact. You see new sign-ups.
Subscribe a contact to a list
The AI adds a new subscribed contact with data fields, or puts an existing contact on a list. Robly may send a confirmation or welcome email.
Changes dataUpdate a contact or take it off a list
The AI changes a contact's data fields or list memberships, or removes the contact from one list. The contact itself is kept.
Changes dataCreate or rename a list
The AI creates a new empty list or renames one. It checks the existing lists first, as Robly does not say if a name already exists.
Changes dataUnsubscribe a contact who asked to stop
The AI unsubscribes a contact so Robly stops emailing it. The API cannot undo this, and the contact can only return through a sign-up form.
Changes dataHow do I connect Robly?
Before you connect
The login page asks for your Robly API ID and Robly API Key.
Both are shown in Robly under My Account. If there is no key yet, or you need a new one, email support@robly.com from your login address. Use the API ID and key, never your Robly password. They are used only to call the Robly API on your behalf and are never shown to anyone.
Claude claude.ai · Desktop
- Open Customize → Connectors, then click + Add → Add custom connector.
- Enter the name Robly and this URL, then click Add:https://
robly. usefulapi. io/ mcp - Claude opens the login page: enter your Robly API ID and Robly API Key.
- In a chat, click + → Connectors and turn on Robly.
Team and Enterprise: an Owner adds the connector for the organization first.
ChatGPT chatgpt.com
- Open Plugins, click +, then Add custom MCP server.
- Enter the name Robly and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
robly. usefulapi. io/ mcp - ChatGPT opens the login page: enter your Robly API ID and Robly API Key.
- In Plugins, install Robly, then choose it in a chat.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Claude Code
Run this command, then run /mcp in Claude Code to log in:
Cursor
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"robly": {
"url": "https://robly.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"robly": {
"type": "http",
"url": "https://robly.usefulapi.io/mcp"
}
}
} Codex
Run these commands. The second one opens the login page:
Other clients
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Robly API ID and Robly API Key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Pricing
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per user | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Robly server only. Ask your AI to run robly_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with robly_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with robly_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 17
Show all 17 tools (the AI picks them for you)
Read only · 6
- List contacts
robly_list_contactsList contacts (members) of the Robly account, newest first as Robly orders them: id, email, subscribed/deleted flags, subscription date, sign-up source, timestamps. Filter by status, by list, or by last-updated time; optionally include each contact's lists and data fields. Pages with limit (max 100) and offset: pass next_offset from the previous reply. Robly does not return a total. - Find contact
robly_find_contactLook up one contact by email address or member id: status, subscription date, sign-up source and, on request, the lists and data fields. Returns found: false when Robly has no such contact. - Check list membership
robly_check_list_membershipWhether one contact (by email or member id) is on one list. - List sub lists
robly_list_sub_listsList the account's sub lists (the lists contacts belong to): id, name, position, timestamps. Public lists only unless include_all is true. Use the ids for list filters and for adding contacts. - List data fields
robly_list_fieldsList the contact data fields (First Name, Last Name, custom fields): id, label, type, required flag and the user_tag that robly_subscribe_contact and robly_update_contact use as the field key. - Get sign-up form
robly_get_signup_formThe data fields and sub lists a new subscriber can be given through the sign-up API (public ones unless include_all is true).
Changes data · 7
- Subscribe contact
robly_subscribe_contactWRITE: add a new subscribed contact (or re-submit an existing one through the sign-up form). With double_opt_in Robly EMAILS the contact a confirmation link first; with welcome_email it EMAILS the welcome message right away; with include_autoresponder it triggers matching autoresponders, which email the contact. Only subscribe people who agreed to receive email. Field values go in `fields`, keyed by the user_tag from robly_list_fields (for example fname, lname). - Add contact to list
robly_add_contact_to_listWRITE: put an existing contact on a list. With include_autoresponder Robly triggers autoresponders matching the newly listed contact, which EMAIL the contact. - Remove contact from list
robly_remove_contact_from_listWRITE: take a contact off one list (the contact itself is kept). - Update contact
robly_update_contactWRITE: change an existing contact's data fields and/or list memberships in one call. Name the contact by member_id (look it up with robly_find_contact). `fields` are keyed by user_tag (robly_list_fields); the email address cannot be changed here. add_to_list_ids puts the contact on those lists, remove_from_list_ids takes it off them. remove_from_all_other_lists also removes the contact from every list NOT named in add_to_list_ids (requires add_to_list_ids). include_autoresponder triggers autoresponders that EMAIL the contact. - Unsubscribe contact
robly_unsubscribe_contactWRITE: unsubscribe a contact so Robly stops emailing it. Robly's API cannot undo this: an unsubscribed contact can only come back through a sign-up form. Use it for a contact that asked to stop. - Create sub list
robly_create_sub_listWRITE: create a new, empty sub list. Robly does not say whether a list with the same name already exists, so check robly_list_sub_lists first. - Rename sub list
robly_rename_sub_listWRITE: rename a sub list.
Your usefulapi plan · 4
- Usage status (free-tier meter)
robly_usage_statusReport the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter. - Request a missing feature
robly_request_featureTell usefulapi that the user needs something the Robly tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. - Upgrade to Pro or Pro+
robly_upgradeGet a paid plan for Robly (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter. - Cancel the Pro subscription
robly_cancel_subscriptionCancel the caller's Robly Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run robly_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with Robly in Claude or ChatGPT?
Check if a person is subscribed and on which lists. See who joined recently and on which lists. Subscribe a contact to a list. Update a contact or take it off a list. Create or rename a list. Unsubscribe a contact who asked to stop. See what you can do for the details.
Is this an official Robly product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by Robly. The server calls the Robly API with your own Robly access, so it sees only the data that your account can see.
Can I connect Robly to Claude or ChatGPT?
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
What do I need to connect?
The login page asks for your Robly API ID and Robly API Key. See Before you connect for where to find them.
Do I put my Robly key or an Authorization header in the client config?
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Robly API ID and Robly API Key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
How do you keep my Robly credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Robly API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Robly.
Can the AI change my Robly data?
Yes, if you approve it. 7 of the 13 Robly tools can create or change data. The other 6 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
What does it cost?
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Robly server only. Cancel any time: your paid plan then runs to the end of the paid period. Run robly_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run robly_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run robly_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a Robly tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with robly_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Which AI clients can I use?
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.