Fact sheet · Email & notification APIs
BillionVerify
The email verification tool built for scale with real-time SMTP checks and 99.9% accuracy
Email verification service that checks whether email addresses can receive mail using real-time SMTP verification, bulk list cleaning, and an API.
Overview
BillionVerify is an email verification service that checks whether email addresses can receive mail before you send to them. It verifies each address by running syntax and format checks, looking up mail servers for the domain, and asking the receiving mail server whether the mailbox exists through SMTP, all without sending a message.
You can use BillionVerify to check single addresses in the dashboard, upload full files for bulk email verification, or call the API from your own app. It works with AI agents through an MCP server and provides status results: valid, invalid, catch-all, disposable, role, or unknown.
Every logged-in account gets 20 free credits every day, up to 600 a month. Credit packs start at $20 for 20,000 credits, with monthly and yearly plans bringing the price down to $0.00014 per email. Credits never expire.
Feature facts
- Live SMTP mailbox verification checking if a mailbox exists and accepts mail
- Bulk file upload and processing for CSV and XLSX lists
- REST API with batch requests supporting up to 50 addresses per call
- Risk flagging for disposable, role, and catch-all addresses
- MCP server integration for AI agents like Claude and Cursor
- Email finder turning a name and company domain into verified work address
- White-label service with custom domain and client workspaces
- Free email tools including SPF, DKIM, DMARC checkers and DNS lookups
Pricing
Pricing model: Freemium
Follow BillionVerify: their milestones, new launches and awards come to you by email, once a day by default.
BillionVerify specifications
| Section | Email & notification APIs |
|---|---|
| Website | billionverify.com |
| Votes2 | 0 |
BillionVerify metrics
| Metric | Value |
|---|---|
| Domain Rating | 60 +1 (up) since last check |
| Trust Flow | 10 no change since last check |
| Citation Flow | 25 no change since last check |
| Referring domains | 347 no change since last check |
| External backlinks | 64,215 no change since last check |
Fact: Ahrefs Domain Rating checked 12 Nov 2026, fact changed 3 Nov 2026. Fact: top topic Computers/Software/Operating Systems (10). Fact: Majestic checked 25 Oct 2026, fact changed 25 Oct 2026. Link facts from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
BillionVerify domain fact sheet
Open the fact sheet
| Domain age | 1 year |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc. |
| DNSSEC | Signed |
BillionVerify launch receipt sheet
What we have measured for BillionVerify since it went live on SaaS Directory Info on 25 October 2026.
- 60 Domain Rating (Ahrefs) +10 (up) since launch
at launch: 50 (25 Oct 2026); latest: 11 Nov 2026 - 10 Trust Flow (Majestic)
first measured 25 Oct 2026 - 347 Referring domains (Majestic)
first measured 25 Oct 2026
Day 17 since launch. Next receipt: day 30, 24 Nov 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.
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Step-by-step tips for before, during and after your launch, free to read on SaaS Directory Info.
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Frequently looked up
- Q1What is BillionVerify?
- BillionVerify is an email verification service that checks whether an email address can receive mail by asking the receiving mail server about the mailbox and returns a status for each address. You can use it in the dashboard, through the REST API, or from an AI agent through the MCP server.
- Q2Does BillionVerify send an email to the address?
- No. The SMTP check stops before any message is sent, so the person behind the address receives nothing.
- Q3How much does BillionVerify cost?
- You get 20 free credits every day you log in, up to 600 a month. Credit packs start at $20 for 20,000 credits, and monthly and yearly plans bring the price down to $0.00014 per email. Each address with a definite result costs 1 credit, and credits never expire.
- Q4Can AI agents use BillionVerify?
- Yes. Connect an MCP client such as Claude, ChatGPT or Cursor to the hosted MCP server and sign in with OAuth, or add the agent skills to your agent framework. Agents can also call the REST API with an API key.
- Q5Why do some addresses come back as unknown?
- Some mail servers, including Apple iCloud, personal Outlook and Hotmail, and servers that throttle or greylist, do not give a reliable answer about a mailbox. BillionVerify returns unknown for these instead of guessing, and does not charge for them.
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See also
| Product | Origin | DR1 | Votes2 |
|---|---|---|---|
 TempMail.nowFree temporary email address without sign-up | not stated | 63 | 0 votes. Log in to vote for TempMail.now in the file |
 FutureMailEmail hosting for your own domain, built for people and their AI agents | United States | 0 | 0 votes. Log in to vote for FutureMail in the file |
 5MinutesAPIWhatsApp API for OTP, alerts and bulk messaging ready in 5 minutes | Pakistan | 0 | 0 votes. Log in to vote for 5MinutesAPI in the file |
 MailBenchA hosted testing SMTP inbox that captures emails without delivering them | Bangladesh | 3 | 0 votes. Log in to vote for MailBench in the file |