Check MillionVerifier credits, verify emails and monitor confirmed bulk verification jobs. For marketers and operations teams using MillionVerifier for email verification. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"millionverifier": {
"url": "https://millionverifier.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"millionverifier": {
"type": "http",
"url": "https://millionverifier.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see Before you connect.
Read the remaining MillionVerifier credit balance before starting an individual check or bulk upload.
millionverifier_credits
Confirm credit usage to verify one email and review its result. Unknown and catch-all outcomes do not establish that a mailbox is deliverable.
Changes data · millionverifier_verify_email
Confirm credit usage to upload a CSV of 1–1,000 addresses. Keep the returned file ID, then check its progress and aggregate verification counts, waiting between checks.
Changes data · millionverifier_upload_file millionverifier_file_info
Use a known file ID to inspect progress, aggregate result counts and failed or canceled status. Read individual email results in the MillionVerifier dashboard.
millionverifier_file_info
The login page asks for your MillionVerifier API key.
Copy your key from MillionVerifier → API. Connecting only reads the credit balance. Verification and bulk upload can spend your MillionVerifier credits and require confirmation. Only submit addresses you have permission to process. Optional API IP restrictions may need adjustment for hosted access. A changed API key creates a separate UsefulAPI billing identity.
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 MillionVerifier 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.
Turn on the MillionVerifier connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
millionverifier_credits | read | Check MillionVerifier credits Read remaining MillionVerifier credits without starting verification. |
millionverifier_verify_email | write | Verify an email with MillionVerifier Verify one email using MillionVerifier's real-time API. Can spend credits and requires confirm:true. The vendor timeout is 10 seconds; this charged GET is never retried. Unknown/catch-all results do not establish deliverability. If the response is lost, check the dashboard before submitting again. |
millionverifier_upload_file | write | Start MillionVerifier bulk verification Create and upload a CSV of 1–1,000 emails for bulk verification. Can start a billable job and spend credits; requires confirm:true. Returns a file ID for millionverifier_file_info. Never retries or automatically polls. A timed-out submission may still create a job; check the dashboard before repeating it. Download individual results in MillionVerifier. |
millionverifier_file_info | read | Read MillionVerifier bulk file status Read an existing bulk file's verification status, progress and aggregate result counts using its file ID. Includes failed/canceled jobs without starting, stopping or re-verifying anything. Does not download individual email results. Wait between polls. |
millionverifier_usage_status | Usage status (free-tier meter) Report 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. | |
millionverifier_request_feature | Request a missing feature Tell usefulapi that the user needs something the MillionVerifier 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. | |
millionverifier_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on MillionVerifier (the free tier caps monthly usage). Plans: "monthly" — $9/month; "yearly" — $90/year (2 months free). Cancel any time: Pro then runs to the end of the paid period, so it also suits a one-time job. *A fair use limit applies. For heavy use (near Pro's limit): "plus" or "plus_yearly" — Pro+, $39/month or $390/year, unlimited tool calls (fair use limit: 100,000 a month); an existing Pro subscription changes to Pro+ in place (needs confirm: true; the price difference for the rest of the period is charged at once). Otherwise returns a short link to open in your browser (it opens Stripe Checkout); after payment the account upgrades automatically. Does not count against the meter. | |
millionverifier_cancel_subscription | Cancel the Pro subscription Cancel the caller's MillionVerifier 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 millionverifier_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | Unlimited* |
*Pro fair use limit: 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this MillionVerifier server only. Subscribe with millionverifier_upgrade (it returns a Stripe Checkout link). Cancel any time with millionverifier_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running millionverifier_upgrade before then undoes the cancel. Or write to [email protected].
Check available verification credits. Screen a new email address. Submit a list for bulk verification. Review an existing bulk job. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by MillionVerifier. The server calls the MillionVerifier API with your own MillionVerifier 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 MillionVerifier API key. See Before you connect for where to find it.
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 MillionVerifier 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 MillionVerifier 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 MillionVerifier.
Yes, if you approve it. 2 of the 4 MillionVerifier tools can create or change data. The other 2 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls (fair use limit: 10,000 tool calls a month), for this MillionVerifier server only. Cancel any time: Pro then runs to the end of the paid period. Run millionverifier_usage_status to see how many calls you used.
Ask the AI to run millionverifier_upgrade: it returns a Stripe Checkout link. To cancel, run millionverifier_cancel_subscription. Pro continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with millionverifier_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.