usefulapirapidmail MCP server
Read rapidmail lists, recipients, mailings and stats; add, update or unsubscribe one recipient. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the rapidmail connector, then ask in plain words. The AI picks the tools.
- How many people subscribed to and left my newsletter list in the last 30 days?
- What were the open and click rates of my latest newsletter?
- Is jane.smith@example.com subscribed to my main list?
- Show whether john.doe@example.com is on my main newsletter list.
What you can do with rapidmail in Claude and ChatGPT
For marketers who send newsletters with rapidmail.
Check how a newsletter performed
The AI lists mailings by status, list or send date and reads the statistics of a sent mailing: opens, clicks, bounces and unsubscriptions.
See who opened, clicked or bounced in a mailing
The AI lists the recipients of a mailing with what each did (delivered, opened, clicked, bounced) and opens one recipient's details.
Check new subscriptions and unsubscriptions of a list
The AI reads the subscription activity of a recipient list between two dates (up to one year) so you can see how the list grows.
Find a subscriber in a list
The AI searches one recipient list by email address, external id or status and opens a recipient with name, custom fields and timestamps.
Add, update or unsubscribe a recipient
The AI adds one recipient to a list (double opt-in by default, with one confirmation email), changes email, name or custom fields, or unsubscribes one recipient.
Changes dataCheck blocked addresses and transactional email status
The AI lists blacklist entries (addresses, domains, patterns) and transactional emails with status, delivery diagnostics and open and click counts.
How do I connect rapidmail?
Before you connect
The login page asks for your API user and API password.
Create them in rapidmail under Settings › API (my.rapidmail.de) with Create new API access. These are separate API credentials, not your rapidmail login e-mail and password. They are used only to call the rapidmail 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 rapidmail and this URL, then click Add:https://
rapidmail. usefulapi. io/ mcp - Claude opens the login page: enter your API user and API password.
- In a chat, click + → Connectors and turn on rapidmail.
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 rapidmail and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
rapidmail. usefulapi. io/ mcp - ChatGPT opens the login page: enter your API user and API password.
- In Plugins, install rapidmail, 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": {
"rapidmail": {
"url": "https://rapidmail.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"rapidmail": {
"type": "http",
"url": "https://rapidmail.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 API user and API password. 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 rapidmail server only. Ask your AI to run rapidmail_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 rapidmail_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 rapidmail_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 20
Show all 20 tools (the AI picks them for you)
Read only · 13
- List recipient lists
rapidmail_list_recipientlistsList the recipient lists (newsletter audiences) of the rapidmail account with id, name, description, whether unsubscribed recipients are blacklisted, and which is the default. Use the ids for recipients and mailing filters. - Get recipient list
rapidmail_get_recipientlistOne recipient list by id. - Get recipient list activity stats
rapidmail_get_recipientlist_activity_statsSubscription activity of one recipient list between two dates (for example new subscriptions and unsubscriptions). The range may be at most one year, must not start before the list was created and must not lie in the future. - List recipients
rapidmail_list_recipientsList the recipients (subscribers) of ONE recipient list, optionally filtered by e-mail address, external id or status. recipientlist_id is required. The long text fields (extrabig1-10) are only returned with include_extrabig. - Get recipient
rapidmail_get_recipientOne recipient by id: e-mail, name, status, custom fields and timestamps. - List mailings
rapidmail_list_mailingsList newsletters (mailings) with status, subject, sender, send time, recipient count and recipient lists. Filter by status, recipient list, created / updated / sent date. Read only: mailings are never created, sent or scheduled by this server. - Get mailing
rapidmail_get_mailingOne mailing by id: status, subject, sender, destinations (recipient lists), send time, size and attachments. - Get mailing statistics
rapidmail_get_mailing_statsStatistics of one sent mailing (opens, clicks, bounces, unsubscriptions and similar totals). - List mailing recipient activity
rapidmail_list_mailing_activityThe recipients a mailing went to and what each did (delivered, opened, clicked, bounced). Detailed event information is only available if the respective plugin is enabled in the rapidmail account. - Get one recipient's activity in a mailing
rapidmail_get_mailing_recipient_activityDelivery and engagement details of one recipient of one mailing. - List mailing folders
rapidmail_list_mailing_foldersThe folders used to organise mailings, with id and name. - List blacklist entries
rapidmail_list_blacklistThe account's blacklist: e-mail addresses, domains and patterns that never receive mailings, with their type, source and dates. - List transactional e-mails
rapidmail_list_transactional_emailsTransactional (SMTP) e-mails sent through the rapidmail account: sender, recipient, subject, status (queued, delivered, bounced...), delivery diagnostics and open/click counts. Metadata only, no message bodies. Filter by date, status, project or address.
Changes data · 3
- Add recipient
rapidmail_create_recipientWRITE: add ONE recipient (subscriber) to a recipient list. By default double opt-in is used: the recipient is created with status 'new' and rapidmail sends ONE confirmation e-mail to that address; they only receive newsletters after confirming. Set double_opt_in=false only if you hold the person's documented consent: the recipient is then stored as 'active' and no e-mail is sent (refused if the address was unsubscribed before). If a deleted recipient with the same address exists it is re-activated; an existing address returns a conflict error. Never use for bulk imports. - Update recipient
rapidmail_update_recipientWRITE: partially update ONE recipient (only the fields you pass change): e-mail, name, custom fields. The status and the recipient list cannot be changed here, and no e-mail is sent. An e-mail address that already exists in the list returns a conflict error. - Unsubscribe recipient
rapidmail_unsubscribe_recipientWRITE: remove ONE recipient from their list. rapidmail only soft-deletes the record (status 'deleted', as if the person had unsubscribed) and the statistics count it as an unsubscription. No goodbye e-mail is sent. Single recipient only.
Your usefulapi plan · 4
- Usage status (free-tier meter)
rapidmail_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
rapidmail_request_featureTell usefulapi that the user needs something the rapidmail 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+
rapidmail_upgradeGet a paid plan for rapidmail (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
rapidmail_cancel_subscriptionCancel the caller's rapidmail 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 rapidmail_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with rapidmail in Claude or ChatGPT?
Check how a newsletter performed. See who opened, clicked or bounced in a mailing. Check new subscriptions and unsubscriptions of a list. Find a subscriber in a list. Add, update or unsubscribe a recipient. Check blocked addresses and transactional email status. See what you can do for the details.
Is this an official rapidmail product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by rapidmail. The server calls the rapidmail API with your own rapidmail access, so it sees only the data that your account can see.
Can I connect rapidmail 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 API user and API password. See Before you connect for where to find them.
Do I put my rapidmail 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 API user and API password. 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 rapidmail credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the rapidmail 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 rapidmail.
Can the AI change my rapidmail data?
Yes, if you approve it. 3 of the 16 rapidmail tools can create or change data. The other 13 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 rapidmail server only. Cancel any time: your paid plan then runs to the end of the paid period. Run rapidmail_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run rapidmail_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 rapidmail_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a rapidmail tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with rapidmail_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.