# BillionVerify, free, Plan, POST /verify/single: Email validation API

> Real-time email verification API over HTTP with full SMTP mailbox checks — the accurate verification API for deliverability, not format-only validation.

BillionVerify's email validation API on its Free Plan plan, $0.00 per 1,000 emails. 4 of the 6 key fields: Address, Its check, Confidence, Company.

- This page: https://datacircle.dev/validate-email-apis/billionverify/free-plan-post-verify-single
- Get it: https://billionverify.com/pricing
- Its API docs: https://billionverify.com/docs/api-reference#single-email-verification
- Sold by: BillionVerify (https://billionverify.com)
- Checked: 2026-10-20

## In the answer

- Completeness: 67%
- Address: ✓
- Its check: ✓
- Confidence: ✓
- Company: ✓

## Price

- $ per 1,000: $0.00
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Repeat free: 24 hours
- Per: call
- Also pays for: from the same budget: Batch Email Verification · File Upload Verification

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Real-time email verification API over HTTP with full SMTP mailbox checks — the accurate verification API for deliverability, not format-only validation.

## Data

- Freshness: live
- Keep data: no limit
- Use data: You may not use the Service to: Violate anti-spam, privacy, consumer protection, or data protection laws. Submit data you do not have the lawful right to process. Abuse promotional offers, bypass rate limits, probe our systems, or attempt unauthorized access. Reverse engineer, copy, resell, sublicense, or build a competing service using the Service except as expressly permitted by us in writing. [...] Subject to these Terms, we grant you a limited, revocable, non-exclusive, non-transferable right to use the Service for your internal business purposes.

## Plan

- Pay: $0
- You get: 20 credits a day
- Enough for: 20 calls a day
- Expires: never

## Rate limit

- Per second: 100
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email. Optional: check_smtp, force_refresh, include_domain_reputation
- Method: POST
- Path: /verify/single

## About the plan

- Plan: Free Plan
- Who can get it: anyone at least 18 years old and legally able to enter into a contract, for their internal business purposes only

## The 29 fields the plan's answer can hold

email, status, score, deliverable, disposable, catch-all, role address, free email, domain, domain age, MX records, MX IP, MX ASN, MX AS organization, domain reputation, SMTP checked, SMTP result, catch-all evidence, reason, domain suggestion, alias of, risk reasons, SMTP response, response time, credits used, verification mode, retryable, SMTPUTF8, retry after seconds

## BillionVerify's plans (19)

- [BillionVerify, free, Plan, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/free-plan-post-verify-single/llms.txt): $0.00 per 1,000, 67% complete, live
- [BillionVerify, $20 pack, Starter, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-single/llms.txt): $1.00 per 1,000, 67% complete, live
- [BillionVerify, $45 pack, Popular, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/45-pack-popular-post-verify-single/llms.txt): $0.90 per 1,000, 67% complete, live
- [BillionVerify, $80 pack, Professional, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/80-pack-professional-post-verify-single/llms.txt): $0.80 per 1,000, 67% complete, live
- [BillionVerify, $150 pack, Business, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/150-pack-business-post-verify-single/llms.txt): $0.75 per 1,000, 67% complete, live
- [BillionVerify, $200 pack, Enterprise, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/200-pack-enterprise-post-verify-single/llms.txt): $0.40 per 1,000, 67% complete, live
- [BillionVerify, $350 pack, Ultimate, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/350-pack-ultimate-post-verify-single/llms.txt): $0.35 per 1,000, 67% complete, live
- [BillionVerify, $16 monthly, Starter, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/16-monthly-starter-post-verify-single/llms.txt): $0.80 per 1,000, 67% complete, live
- [BillionVerify, $36 monthly, Popular, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/36-monthly-popular-post-verify-single/llms.txt): $0.72 per 1,000, 67% complete, live
- [BillionVerify, $64 monthly, Professional, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/64-monthly-professional-post-verify-single/llms.txt): $0.64 per 1,000, 67% complete, live
- [BillionVerify, $120 monthly, Business, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/120-monthly-business-post-verify-single/llms.txt): $0.60 per 1,000, 67% complete, live
- [BillionVerify, $160 monthly, Enterprise, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/160-monthly-enterprise-post-verify-single/llms.txt): $0.32 per 1,000, 67% complete, live
- [BillionVerify, $280 monthly, Ultimate, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/280-monthly-ultimate-post-verify-single/llms.txt): $0.28 per 1,000, 67% complete, live
- [BillionVerify, $96 yearly, Starter, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/96-yearly-starter-post-verify-single/llms.txt): $0.40 per 1,000, 67% complete, live
- [BillionVerify, $216 yearly, Popular, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/216-yearly-popular-post-verify-single/llms.txt): $0.36 per 1,000, 67% complete, live
- [BillionVerify, $384 yearly, Professional, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/384-yearly-professional-post-verify-single/llms.txt): $0.32 per 1,000, 67% complete, live
- [BillionVerify, $720 yearly, Business, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/720-yearly-business-post-verify-single/llms.txt): $0.30 per 1,000, 67% complete, live
- [BillionVerify, $960 yearly, Enterprise, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/960-yearly-enterprise-post-verify-single/llms.txt): $0.16 per 1,000, 67% complete, live
- [BillionVerify, $1,680 yearly, Ultimate, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/1680-yearly-ultimate-post-verify-single/llms.txt): $0.14 per 1,000, 67% complete, live

## BillionVerify's calls (3)

- `POST /verify/bulk`: [BillionVerify, free, Plan, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/free-plan-post-verify-bulk/llms.txt)
- `POST /verify/file`: [BillionVerify, free, Plan, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/free-plan-post-verify-file/llms.txt)
- `POST /verify/single`: [BillionVerify, free, Plan, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/free-plan-post-verify-single/llms.txt)

## Similar plans of other providers

- [Bouncer, free, 100 free credits, POST /v1.1/email/verify/batch](https://datacircle.dev/validate-email-apis/bouncer/free-100-free-credits-post-v1-1-email-verify-batch/llms.txt): $0.00 per 1,000, 67% complete, live
- [BounceCheck, free, Free, POST /verification/bulk](https://datacircle.dev/validate-email-apis/bouncecheck/free-free-post-verification-bulk/llms.txt): $0.00 per 1,000, 50% complete, live
- [Bounceless, free, 100 credits once, POST /v1/requests, Create a batch (emails)](https://datacircle.dev/validate-email-apis/bounceless/free-100-credits-once-post-v1-requests-100-credits/llms.txt): $0.00 per 1,000, 50% complete, live
- [Bouncify, free](https://datacircle.dev/validate-email-apis/bouncify/free/llms.txt): $0.00 per 1,000, 50% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

- https://api.billionverify.com/openapi.yaml
- https://billionverify.com/docs/api-reference.md
- https://billionverify.com/email-verification-api.md
- https://billionverify.com/help.md
- https://billionverify.com/help/disposable-emails-are-free.md
- https://billionverify.com/help/do-credits-expire.md
- https://billionverify.com/help/no-charge-for-recheck-within-24h.md
- https://billionverify.com/help/what-does-catch-all-mean.md
- https://billionverify.com/help/which-results-are-charged.md
- https://billionverify.com/llms-full.txt
- https://billionverify.com/llms.txt
- https://billionverify.com/pricing
- https://billionverify.com/pricing.md
- https://billionverify.com/terms