# BillionVerify, $20 pack, Starter, POST /verify/file: Email verification API

> POST /verify/file — submit CSV or Excel files to the API for background processing. Results are delivered via webhook callback when the API job completes.

BillionVerify's email verification API on its Starter plan. It costs $1.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Address, Deliverability.
Half of the 1,712 plans we rank by price cost $2.632 per 1,000 or less. This plan costs less than 77% of the 1,712 plans.
The cheapest plan we rank by price is [treg, top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt), at $0.00 per 1,000.

- This page: https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-file
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://billionverify.com/pricing
- Its API docs: https://billionverify.com/docs/api-reference#file-upload-verification
- Sold by: BillionVerify (https://billionverify.com)
- Checked: 2026-10-20

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

- $ per 1,000: $1.00
- Billing: pay first

## Aggregators

- Aggregators: none

## Charges

- Repeat free: 24 hours
- Per: result
- Also pays for: from the same budget: Single Email Verification · Batch Email Verification · Email Finder · Bulk Email Finder · Company Search

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $1.00

## In their words

- Their pitch: POST /verify/file — submit CSV or Excel files to the API for background processing. Results are delivered via webhook callback when the API job completes.

## 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: $20
- You get: 20,000 credits
- Enough for: 20,000 results
- Expires: never

## Rate limit

- Per second: 5

## Speed

- Answer: by polling or webhook

## The call

- You send: file. Optional: check_smtp, email_column, preserve_original
- Method: POST
- Path: /verify/file

## About the plan

- Plan: Starter
- 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 27 fields the plan's answer can hold

task ID, file name, status, unique emails, total rows, progress, email progress, chunk progress, progress source, total emails, processed emails, valid emails, invalid emails, unknown emails, role emails, catch-all emails, risky emails, disposable emails, credits used, download URL, direct download URL, direct download expires at, started at, completed at, total chunks, completed chunks, failed chunks

## BillionVerify's plans (18)

- [BillionVerify, $20 pack, Starter, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-file/llms.txt): $1.00 per 1,000, 33% complete, live
- [BillionVerify, $45 pack, Popular, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/45-pack-popular-post-verify-file/llms.txt): $0.90 per 1,000, 33% complete, live
- [BillionVerify, $80 pack, Professional, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/80-pack-professional-post-verify-file/llms.txt): $0.80 per 1,000, 33% complete, live
- [BillionVerify, $150 pack, Business, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/150-pack-business-post-verify-file/llms.txt): $0.75 per 1,000, 33% complete, live
- [BillionVerify, $200 pack, Enterprise, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/200-pack-enterprise-post-verify-file/llms.txt): $0.40 per 1,000, 33% complete, live
- [BillionVerify, $350 pack, Ultimate, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/350-pack-ultimate-post-verify-file/llms.txt): $0.35 per 1,000, 33% complete, live
- [BillionVerify, $16 monthly, Starter, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/16-monthly-starter-post-verify-file/llms.txt): $0.80 per 1,000, 33% complete, live
- [BillionVerify, $36 monthly, Popular, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/36-monthly-popular-post-verify-file/llms.txt): $0.72 per 1,000, 33% complete, live
- [BillionVerify, $64 monthly, Professional, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/64-monthly-professional-post-verify-file/llms.txt): $0.64 per 1,000, 33% complete, live
- [BillionVerify, $120 monthly, Business, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/120-monthly-business-post-verify-file/llms.txt): $0.60 per 1,000, 33% complete, live
- [BillionVerify, $160 monthly, Enterprise, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/160-monthly-enterprise-post-verify-file/llms.txt): $0.32 per 1,000, 33% complete, live
- [BillionVerify, $280 monthly, Ultimate, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/280-monthly-ultimate-post-verify-file/llms.txt): $0.28 per 1,000, 33% complete, live
- [BillionVerify, $96 yearly, Starter, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/96-yearly-starter-post-verify-file/llms.txt): $0.40 per 1,000, 33% complete, live
- [BillionVerify, $216 yearly, Popular, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/216-yearly-popular-post-verify-file/llms.txt): $0.36 per 1,000, 33% complete, live
- [BillionVerify, $384 yearly, Professional, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/384-yearly-professional-post-verify-file/llms.txt): $0.32 per 1,000, 33% complete, live
- [BillionVerify, $720 yearly, Business, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/720-yearly-business-post-verify-file/llms.txt): $0.30 per 1,000, 33% complete, live
- [BillionVerify, $960 yearly, Enterprise, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/960-yearly-enterprise-post-verify-file/llms.txt): $0.16 per 1,000, 33% complete, live
- [BillionVerify, $1,680 yearly, Ultimate, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/1680-yearly-ultimate-post-verify-file/llms.txt): $0.14 per 1,000, 33% complete, live

## BillionVerify's calls (3)

- `POST /verify/bulk`: [BillionVerify, $20 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-bulk/llms.txt)
- `POST /verify/file`: [BillionVerify, $20 pack, Starter, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-file/llms.txt)
- `POST /verify/single`: [BillionVerify, $20 pack, Starter, POST /verify/single](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-single/llms.txt)

## BillionVerify's APIs (1)

- [BillionVerify: email verification API pricing, 18 plans, POST /verify/file](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-file/llms.txt)

## BillionVerify: email verification API alternatives

- [Verimail, $100 pack](https://datacircle.dev/validate-email-apis/verimail/100-pack/llms.txt): $1.00 per 1,000, 50% complete, live
- [OneShot, pay as you go](https://datacircle.dev/validate-email-apis/oneshot/pay-as-you-go/llms.txt): $1.00 per 1,000, 33% complete, live
- [DeBounce, top-up from $200, 200K credits, GET /v1/, Single email validation](https://datacircle.dev/validate-email-apis/debounce/top-up-from-200-200k-credits-get-v1/llms.txt): $1.00 per 1,000, 50% complete, live
- [NeuralVerge, $50 monthly](https://datacircle.dev/validate-email-apis/neuralverge/50-monthly/llms.txt): $1.00 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