Read audiences, groups, mailings and campaign results without sending email or changing contacts. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Emma connector, then ask in plain words. The AI picks the tools.
For marketing teams reporting on Emma audiences and email campaigns.
See audience groups and their member counts, then inspect the members in a group. Follow additional pages when you need the complete group membership.
Find recent mailings and review their delivered messages, opens, clicks and opt-outs alongside account-level response statistics.
Review which links received clicks in a mailing and inspect recipient activity to understand how people interacted with the campaign.
The login page asks for your Emma account id, Public API key and Private API key.
In Emma open Account settings → API Key and click Generate API Key: that page shows the account id, public key and private key (agency accounts: Menu → Accounts → the account's settings → API key, and use that sub-account's own id). See the Emma API documentation. Your keys are used only to call the Emma API on your behalf; they are never shown to anyone.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"emma": {
"url": "https://emma.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"emma": {
"type": "http",
"url": "https://emma.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
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 Emma account id, Public API key and Private 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.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper connected account | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per connected account | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Emma server only. Ask your AI to run emma_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 emma_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 emma_upgrade before then undoes the cancel. Or write to [email protected].
emma_list_groupsemma_get_groupemma_list_group_membersemma_list_membersemma_get_memberemma_find_member_by_emailemma_get_member_groupsemma_get_member_mailingsemma_list_fieldsemma_get_importemma_list_mailingsemma_get_mailingemma_list_mailing_membersemma_get_response_summaryemma_get_mailing_responseemma_list_mailing_linksemma_list_mailing_activityemma_list_searchesemma_get_search_membersemma_usage_statusemma_request_featureemma_upgradeemma_cancel_subscriptionReview audience groups and membership. Compare email campaign results. Inspect link clicks and recipient activity. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Emma. The server calls the Emma API with your own Emma access, so it sees only the data that your account can see.
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.
The login page asks for your Emma account id, Public API key and Private API key. See Before you connect for where to find them.
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 Emma account id, Public API key and Private 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.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Emma 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 Emma.
All 19 Emma tools are marked read-only.
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 Emma server only. Cancel any time: your paid plan then runs to the end of the paid period. Run emma_usage_status to see how many calls you used.
Ask the AI to run emma_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 emma_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with emma_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.
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.