llms.txt
# BillionVerify
> BillionVerify checks whether email addresses can receive mail, one at a time, as a whole list or through a REST API, without sending an email. It also finds work email addresses and offers free email DNS and deliverability tools.
- **Type**: Web application (SaaS) and REST API
- **Category**: Email verification, email list cleaning, email finder and email deliverability tools
- **Languages**: English and 15 more: Simplified Chinese, Traditional Chinese, Spanish, Japanese, French, German, Italian, Polish, Hindi, Malay, Portuguese, Indonesian, Russian, Korean, Dutch
- **Free plan**: 20 credits every day you log in, up to 600 credits a month; no credit card required
- **Credit packs (one-time)**: Starter $20 (20,000 credits); Popular $45 (50,000 credits); Professional $80 (100,000 credits); Business $150 (200,000 credits); Enterprise $200 (500,000 credits); Ultimate $350 (1,000,000 credits)
- **Subscriptions**: Starter $16/month (20,000 credits) or $96/year (240,000 credits); Popular $36/month (50,000 credits) or $216/year (600,000 credits); Professional $64/month (100,000 credits) or $384/year (1,200,000 credits); Business $120/month (200,000 credits) or $720/year (2,400,000 credits); Enterprise $160/month (500,000 credits) or $960/year (6,000,000 credits); Ultimate $280/month (1,000,000 credits) or $1,680/year (12,000,000 credits)
- **Cost per check**: 1 credit per email with a definite result; `unknown`, `disposable` and badly formatted addresses are free, and so is a repeat check of the same address within 24 hours
- **Credits**: never expire
- **API**: REST at https://api.billionverify.com/v1, plus a hosted MCP server at https://mcp.billionverify.com/mcp
- **Last updated**: 2026-10-14
Every page has a Markdown version: add .md to the page URL (the home page is /index.md), or request the page URL with an `Accept: text/markdown` header.
Other languages use a prefix with the same path (for example /zh-hans/pricing); each page lists its language versions in hreflang. Language home pages: [zh-hans](https://billionverify.com/zh-hans/index.md), [zh-hant](https://billionverify.com/zh-hant/index.md), [es](https://billionverify.com/es/index.md), [ja](https://billionverify.com/ja/index.md), [fr](https://billionverify.com/fr/index.md), [de](https://billionverify.com/de/index.md), [it](https://billionverify.com/it/index.md), [pl](https://billionverify.com/pl/index.md), [hi](https://billionverify.com/hi/index.md), [ms](https://billionverify.com/ms/index.md), [pt](https://billionverify.com/pt/index.md), [id](https://billionverify.com/id/index.md), [ru](https://billionverify.com/ru/index.md), [ko](https://billionverify.com/ko/index.md), [nl](https://billionverify.com/nl/index.md).
- [Email Verification Tool & Bulk Email Checker | BillionVerify](https://billionverify.com/index.md): The email verification tool built for scale. Real-time SMTP checks, bulk list cleaning, and API with 99.9% accuracy. 20 free credits a day, up to 600 a month.
## Email verification
- [Real Time SMTP Email Verification Service](https://billionverify.com/email-verification.md): A real time email verification service with live SMTP mailbox checks: syntax, domain, MX, and risk flags in under two seconds. Free real time email verification tier.
- [Bulk Email Verification Service & List Cleaning](https://billionverify.com/bulk-email-verification.md): Bulk email verification service for lists of any size. Verify bulk email lists with 99.9% SMTP-level accuracy, sync or async, from hundreds to millions.
- [Free Email Verification API with Real SMTP Checks](https://billionverify.com/email-verification-api.md): Email verification API with real SMTP mailbox checks. A real-time email verification API for apps, forms, and AI agents — not syntax-only validation.
- [Free Email List Cleaning Service](https://billionverify.com/email-list-cleaning.md): Email list cleaning service with live SMTP verification on every row: dedupe, suppress hard bounces, keep the reasons. Clean email list free tool, no signup to try.
- [White Label Email Verification Service](https://billionverify.com/whitelabel.md): White label email verification under your domain, logo, and colours. All paid features included, 99.7% uptime SLA, live in one business day.
## Email finder
- [Free Email Finder by Name and Company](https://billionverify.com/email-finder.md): Free email finder that takes a name and a company domain and returns the verified work address. Email finder by name, with SMTP verification on every result.
- [Bulk Email Finder CSV](https://billionverify.com/bulk-email-finder.md): Bulk email finder for CSV: upload names and company domains, get one verified work email per matched person, keep every row, pay nothing for no-match rows.
- [Company Email Search by Domain](https://billionverify.com/company-search.md): Company email search: enter a company domain and get the verified addresses behind it. Find company emails free, SMTP-verified before you see them.
## Free tools
- [Free Email Tools for Verification and DNS](https://billionverify.com/free-email-tools.md): Nineteen free email tools in four groups: free email verification tools, DNS and authentication checkers, message diagnostics, and list utilities. No signup.
- [Free Email Verifier: Check If an Email Address Is Valid](https://billionverify.com/email-verifier.md): Check if an email address is valid with a free email verifier, no signup — syntax, MX, SMTP mailbox, disposable, role and catch-all checks.
- [Free Email Deliverability and Inbox Placement Test](https://billionverify.com/email-deliverability-test.md): Free email deliverability test: send one message and get authentication, DNS, spam-filter, blacklist, header, and content scores. A free email inbox placement test, no signup.
- [Free Email Blacklist Checker — Am I Blacklisted?](https://billionverify.com/blacklist-checker.md): Free email blacklist checker: is your IP or domain listed on Spamhaus, SpamCop, SORBS, or Barracuda? An am-I-blacklisted checker, free and instant.
- [Free MX Record Lookup & MX Checker](https://billionverify.com/mx-lookup.md): Free MX record lookup: resolve every MX record for a domain with priorities, detect Null MX, and identify the mail provider. A MX record lookup tool, free, no signup.
## Developers and AI agents
- [Documentation](https://billionverify.com/docs.md): Email checker and email verification API documentation. Quickstart guide, API reference, SDKs for Python, Node.js, Go.
- [API Reference](https://billionverify.com/docs/api-reference.md): Complete BillionVerify API reference for authentication, email verification, file jobs, downloads, credits, and webhooks.
- [Email Verification MCP Server for AI Agents](https://billionverify.com/mcp.md): A hosted email verification MCP server: give Claude, Cursor, and any MCP client real SMTP mailbox verification as a callable tool. OAuth, no local process.
- [Email Verification Agent Skills for AI Agents](https://billionverify.com/agent-skills.md): Email verification agent skills: give Claude, Gemini, and any agent platform a real SMTP mailbox check in one click. AI agent email verification, no integration code.
## Comparisons
- [BillionVerify: Best Email Verification Alternatives](https://billionverify.com/vs.md): Email checker and email verification comparisons. Compare BillionVerify vs NeverBounce, ZeroBounce. Free email checker from BillionVerify.
- [Best Email Verification Tools 2026 Compared](https://billionverify.com/best-email-verification-tools.md): Best email verification tools 2026, compared on SMTP accuracy, catch-all handling, price per email, and free tier. Independent criteria, not vendor claims.
- [2026 Email Verification Benchmark Report](https://billionverify.com/benchmark.md): An email verification benchmark across 20 providers: accuracy, speed, pricing, and AI integration, all measured on one fixed corpus.
## Guides and help
- [BillionVerify: Email Verification Blog](https://billionverify.com/blog.md): Email checker tips and email verification guides. Deliverability best practices. Free email checker from BillionVerify.
- [Email How-To Guides & Best Practices | BillionVerify](https://billionverify.com/guides.md): Step-by-step guides on email verification, reducing bounce rates, and email best practices.
- [BillionVerify: Email Glossary & Terminology Guide](https://billionverify.com/glossary.md): Complete guide to email marketing, deliverability, spam filtering, and authentication. Master essential email concepts with BillionVerify.
- [BillionVerify Help center](https://billionverify.com/help.md): Clear answers about verification results, billing, credits, privacy, and provider-specific limitations.
## Company
- [Email Verification Pricing & Plans | BillionVerify](https://billionverify.com/pricing.md): Email verification pricing from $20 for 20,000 credits at $0.001/email — the lowest per-email rate of any major verifier. 20 free credits a day, up to 600/mo.
- [AI Email Verification Features](https://billionverify.com/features.md): Every AI email verification feature in one place: SMTP verification, disposable and catch-all detection, bulk processing, API, MCP Server, and Agent Skills.
- [About BillionVerify: Email Verification Service](https://billionverify.com/about.md): BillionVerify is an email verification service with live SMTP checks, bulk list cleaning, an API and an MCP server. What it does, pricing, key facts, FAQs.
- [Contact BillionVerify](https://billionverify.com/contact.md): Send BillionVerify a question about verification results, billing, integrations, or your account.
## Discovery
- [Sitemap index](https://billionverify.com/sitemap.xml)
- [Marketing pages sitemap](https://billionverify.com/sitemap-static.xml)
- [Integrations sitemap](https://billionverify.com/sitemap-integrations.xml)
- [Blog sitemap](https://billionverify.com/sitemap-blog.xml)
- [Blog categories sitemap](https://billionverify.com/sitemap-categories.xml)
- [Glossary sitemap](https://billionverify.com/sitemap-glossary.xml)
- [Guides sitemap](https://billionverify.com/sitemap-guides.xml)
- [Help center sitemap](https://billionverify.com/sitemap-help.xml)
- [Docs sitemap](https://billionverify.com/sitemap-docs.xml)
- [Robots](https://billionverify.com/robots.txt)
## Optional
- [llms-full.txt](https://billionverify.com/llms-full.txt): Full reference: every English page by topic, verification results and what they cost, the API, pricing and notes for agents.
