Buyer guide · SimpleVerifier Team
Verify emails inside Claude, Cursor and other AI assistants
SimpleVerifier runs a remote MCP server at https://simpleverifier.com/api/mcp. Add it to ChatGPT or claude.ai by signing in with your SimpleVerifier account, or to Claude Code, Claude Desktop, Cursor, VS Code or Windsurf with an API key, on a Pro, Business or Agency plan. The assistant can then verify one address or up to 100 per call, check a domain's MX, SPF and DMARC, and check phone formats.
The tools are verify_email, verify_emails, get_job_results, check_phone_format, check_domain, get_usage. Each returns valid, risky or invalid with a plain-English reason, the same result the API and the dashboard give. Setup commands for each client are on the MCP docs page.
ChatGPT and claude.ai add a remote MCP server by URL and sign you in with OAuth: you approve a consent screen that lists what the app can do, with no key to copy. Asking ChatGPT itself to "verify" an address without the connector does not check anything: a language model cannot open an SMTP conversation with a mail server, so any verdict it gives without a tool is a guess.
SimpleVerifier facts: prices, packs and limits
- What it is
- Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.
- Price per check
- Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.
- One-time packs
- 10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).
- Free checks
- First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.
- Billing
- Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.
- Speed today
- One sending IP today, shared by every customer: about 13,000 mailbox checks a day in the standard lane. Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.
- Catch-all handling
- Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.
- API and MCP
- REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 6 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.
- Integrations
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.
- Phone
- Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.
- What it does not do
- No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.
SimpleVerifier facts from our pricing page and product. Last updated .
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
Have a list? Sign in with Google and the first 100 addresses are checked free, with results to download. No card.
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What it costs
MCP calls are API calls. Pro ($39 a month) includes 10,000 calls a month included, then $1.50 per 1,000; Business ($99) includes 100,000 and Agency ($249) 300,000, then $1.00 per 1,000. Starter does not include API or MCP access. The 100 free checks run in the dashboard, not over MCP.
What the assistant can and cannot tell you
A batch of up to 100 addresses runs as a list job: the call waits up to 45 seconds and returns every result, or a job id the assistant polls with get_job_results. check_phone_format is a numbering-plan check only and never says whether a number is in service. Microsoft consumer mailboxes are not probed while Microsoft refuses checks from our server's network, and come back risky.
Common questions
- Can ChatGPT verify an email address?
- Not by itself. Verifying a mailbox means talking to the recipient's mail server over SMTP, which a language model cannot do without a tool. Add SimpleVerifier's MCP server as a custom MCP server in ChatGPT (steps on the MCP docs page) and sign in with your account on a Pro, Business or Agency plan, or use the free checker on simpleverifier.com.
- How do I add email verification to Claude Code?
- Run: claude mcp add --transport http simpleverifier https://simpleverifier.com/api/mcp --header "Authorization: Bearer YOUR_API_KEY". The key comes from the API keys page on a Pro, Business or Agency plan. In claude.ai, add it under Customize, Connectors, Add custom connector, and sign in instead of using a key.
- How many emails can an AI agent verify per call?
- Up to 100 with verify_emails. Larger lists are better uploaded as a CSV in the dashboard, which does not use API calls.
Get an API key for your assistant
Pro is $39 a month and never cuts you off: the first 100,000 emails a month run at full speed, then big lists run slower. CSV uploads, the API (10,000 calls a month, then $1.50 per 1,000), the Google Sheets add-on and the email finder are included, and you can cancel any time. For smaller volumes, Starter is $9 a month for 2,500 emails a month.
The first 100 email checks are free with a Google sign-in, no card, on the same engine the paid plans use.