# NullBounce, free: Email verification API

> Verify email deliverability in real time with a lightweight, synchronous HTTP request. Protect registration forms, checkouts, and backend pipelines.

NullBounce's email verification API on its 100 free credits plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Address, Deliverability.
The cheapest of the 1,849 plans we rank by price is [treg, top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt). treg asks one provider after another until one answers. treg costs $0.00 per 1,000 emails on average. You pay $26.95 per 1,000 emails when no provider answers.

- This page: https://datacircle.dev/validate-email-apis/nullbounce/free
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://nullbounce.com/pricing
- Its API docs: https://nullbounce.com/docs/api#1-validate-email-address
- Sold by: NullBounce (https://nullbounce.com)
- Checked: 2026-10-27

## In the answer

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

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Verify email deliverability in real time with a lightweight, synchronous HTTP request. Protect registration forms, checkouts, and backend pipelines.

## Data

- Freshness: live
- Keep data: no limit
- Use data: solely for its own internal business purposes and use [...] abide by all applicable laws, treaties and regulations in connection with its use of the NullBounce Hosted Service

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 calls, once
- Expires: never

## Rate limit

- Per second: 10
- Batch: 1

## Speed

- Answer: in the call
- Median: 0.45 s

## The call

- You send: email
- Method: POST
- Path: /api/v1/validate/

## About the plan

- Plan: 100 free credits
- Who can get it: every newly registered account, no credit card required

## The 7 fields the plan's answer can hold

email, result, status, sub-status, disposable, role, free

## NullBounce's plans (12)

- [NullBounce, free](https://datacircle.dev/validate-email-apis/nullbounce/free/llms.txt): $0.00 per 1,000, 33% complete, live
- [NullBounce, $5 pack](https://datacircle.dev/validate-email-apis/nullbounce/5-pack/llms.txt): $5.00 per 1,000, 33% complete, live
- [NullBounce, $10 pack](https://datacircle.dev/validate-email-apis/nullbounce/10-pack/llms.txt): $2.00 per 1,000, 33% complete, live
- [NullBounce, $15 pack](https://datacircle.dev/validate-email-apis/nullbounce/15-pack/llms.txt): $1.50 per 1,000, 33% complete, live
- [NullBounce, $30 pack](https://datacircle.dev/validate-email-apis/nullbounce/30-pack/llms.txt): $1.20 per 1,000, 33% complete, live
- [NullBounce, $50 pack](https://datacircle.dev/validate-email-apis/nullbounce/50-pack/llms.txt): $1.00 per 1,000, 33% complete, live
- [NullBounce, $90 pack](https://datacircle.dev/validate-email-apis/nullbounce/90-pack/llms.txt): $0.90 per 1,000, 33% complete, live
- [NullBounce, $140 pack](https://datacircle.dev/validate-email-apis/nullbounce/140-pack/llms.txt): $0.70 per 1,000, 33% complete, live
- [NullBounce, $300 pack](https://datacircle.dev/validate-email-apis/nullbounce/300-pack/llms.txt): $0.60 per 1,000, 33% complete, live
- [NullBounce, $500 pack](https://datacircle.dev/validate-email-apis/nullbounce/500-pack/llms.txt): $0.50 per 1,000, 33% complete, live
- [NullBounce, $800 pack](https://datacircle.dev/validate-email-apis/nullbounce/800-pack/llms.txt): $0.40 per 1,000, 33% complete, live
- [NullBounce, $1,500 pack](https://datacircle.dev/validate-email-apis/nullbounce/1500-pack/llms.txt): $0.30 per 1,000, 33% complete, live

## NullBounce's calls (1)

- `POST /api/v1/validate/`: [NullBounce, free](https://datacircle.dev/validate-email-apis/nullbounce/free/llms.txt)

## NullBounce's APIs (1)

- [NullBounce: email verification API pricing, 12 plans](https://datacircle.dev/validate-email-apis/nullbounce/free/llms.txt)

## NullBounce: email verification API alternatives

- [Verimail, $299 monthly](https://datacircle.dev/validate-email-apis/verimail/299-monthly/llms.txt): $0.299 per 1,000, 50% complete, live
- [BillionVerify, $720 yearly, Business, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/720-yearly-business-post-verify-bulk/llms.txt): $0.30 per 1,000, 67% complete, live
- [VerifySwift, $1,499.99 pack](https://datacircle.dev/validate-email-apis/verifyswift/1499-99-pack/llms.txt): $0.30 per 1,000, 50% complete, live
- [VeriMails, $150 monthly, Scale, POST /api/verify/single](https://datacircle.dev/validate-email-apis/verimails/150-monthly-scale-post-api-verify-single/llms.txt): $0.30 per 1,000, 67% 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 2026-10-27.

- https://nullbounce.com/docs/api
- https://nullbounce.com/docs/billing
- https://nullbounce.com/docs/legal/terms-of-use
- https://nullbounce.com/docs/understanding-results
- https://nullbounce.com/email-verification-api
- https://nullbounce.com/pricing