# Kickbox

> Pay-as-you-go email verification with an optional threat score

Kickbox cleans email lists and checks sign-ups as they happen, through file uploads, an API or connections to email platforms such as Mailchimp, Klaviyo and HubSpot. An optional Threat Score flags addresses tied to abuse or complaints. It does not warm up inboxes or manage DMARC, though it sells deliverability consulting. Verifications are bought in packs, from $5 for 500.

- **Category:** Email Verification & Deliverability
- **Made by:** J2 Martech Corp
- **Website:** https://kickbox.com
- **Runs on:** Web
- **Facts last checked:** Oct 18, 2026

## Pricing

Kickbox is a paid product with a free trial, starting at $5 one-time for 500 verifications.

- **Pricing model:** Free trial
- **Free plan:** None.
- **Free trial:** The first 100 verifications are free.

| Plan | Price | What you get |
| --- | --- | --- |
| Pay as you go | $5 one-time for 500 verifications | Larger packs cost less per check: $10 for 1,000, $70 for 10,000, $500 for 100,000 and $2,999 for 1 million. Unknown results are refunded. |
| Custom | Custom | Volume pricing for more than 1 million verifications, through sales. |

Read from https://kickbox.com/pricing/ on Oct 18, 2026. Prices change, so confirm with Kickbox before buying.

## Ways to pay less

- **15% off for nonprofits** (Nonprofit): Kickbox gives nonprofit organizations a 15% discount on verification. Source: https://kickbox.com/email-verification-non-profits/

## Key features

- **List verification:** Upload a list and Kickbox sorts each address by deliverability; the vendor says 100,000 addresses take about an hour.
- **Verification API:** Checks addresses at sign-up in real time, with a sandbox mode for testing without spending credits and a free endpoint for spotting disposable domains.
- **Threat Score:** Flags addresses linked to abuse, complaints or a poor sending reputation, for one extra credit only when a threat signal is found.
- **Native integrations:** Verifies lists inside Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and others, with more through Zapier.
- **Deliverability consulting:** Deliverability audits and consulting from Kickbox's own team are offered as a separate service beside verification.

## Good for

- Marketers who verify a list now and then without a subscription
- Developers adding real-time checks to a sign-up form
- Teams on Braze, Iterable or Klaviyo that want verification built in

## Worth knowing

- Only pay-as-you-go packs are listed; there is no monthly plan on the pricing page.
- Kickbox verifies addresses only; it has no warm-up, inbox placement testing or DMARC tools.
- Threat Score can double the cost per address when it finds a signal.

## ToolGPA grades

**GPA: 2.4 out of 4**, graded Oct 18, 2026. Kickbox sells checks in packs from $5, with no subscription, and its API is built for checking sign-ups as they happen, with a sandbox for testing. 10,000 checks cost $70, near the dear end of the list cleaners. It only verifies: no warm-up or DMARC, though its team sells deliverability consulting.

- **Value for money: C.** $70 for a one-off pack of 10,000. Among its listed rivals only ZeroBounce (about $129) costs more; NeverBounce is $50, Bouncer and Emailable $60 and DeBounce $25. Unknown results are refunded, and Threat Score costs one more credit only when it finds something.
- **Free plan and trial: C.** No free plan, but the first 100 checks are free. Enough to see what the results look like, not to clean a real list.
- **Features: C.** It does the checking job fully: bulk lists, a real-time API with a sandbox, a free check for disposable domains and an optional Threat Score. That's a smaller job, though: no warm-up, placement tests or DMARC tools.
- **Ease of use: B.** No App Store rating on record, but nothing to set up: upload a list and it comes back sorted by deliverability. Kickbox says 100,000 addresses take about an hour.
- **Platforms and integrations: B.** Web and an API, with Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid and Salesforce, and more through Zapier. No phone or desktop app.

These are ToolGPA's own grades. Graded from this listing, whose facts were read from Kickbox's own pages on 18 October 2026. Not based on using the product, and shorter than our full reviews.

## Where it stands among email verification and deliverability tools

- Kickbox's GPA of 2.4 is higher than 6 of the 15 other email verification and deliverability tools we grade, and level with 8.
- It stands best on ease of use (B, above 8 of 15) and worst on features (C, above 0).

The category's chart of price against score: https://toolgpa.com/charts/email-deliverability

## Keep it, or make your own?

**Keep it.** Nothing Kickbox does is plain enough to make in a weekend. The 2 things listed below take a company. It costs $5, paid once.

- You could not: Checking that an address exists without writing to it.
- You could not: It plugs into other products, Mailchimp, Klaviyo and HubSpot among them, and has an API.

A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it.

## Works with

Mailchimp, Klaviyo, HubSpot, Braze, Iterable, SendGrid, Salesforce, Zapier

**Tags:** Email verification, Public API

## Alternatives

- [NeverBounce](https://toolgpa.com/tools/neverbounce): Email list cleaning and real-time verification, now part of ZoomInfo. [Compare](https://toolgpa.com/compare/kickbox-vs-neverbounce)
- [ZeroBounce](https://toolgpa.com/tools/zerobounce): Email list verification with warm-up and DMARC monitoring in one plan. [Compare](https://toolgpa.com/compare/kickbox-vs-zerobounce)
- [Bouncer](https://toolgpa.com/tools/bouncer): Email list verification with credits that never expire. [Compare](https://toolgpa.com/compare/bouncer-vs-kickbox)
- [Emailable](https://toolgpa.com/tools/emailable): Email list verification with inbox reports and blacklist monitoring. [Compare](https://toolgpa.com/compare/emailable-vs-kickbox)
- [DeBounce](https://toolgpa.com/tools/debounce): Email list validation with credits from $15 that never expire. [Compare](https://toolgpa.com/compare/debounce-vs-kickbox)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 18, 2026:

- https://kickbox.com/pricing/
- https://kickbox.com/about/
- https://kickbox.com/integrations/
- https://kickbox.com/email-threat-score/
- https://kickbox.com/email-verification-non-profits/
- https://docs.kickbox.com/llms.txt

Page: https://toolgpa.com/tools/kickbox
Listed by ToolGPA (toolgpa.com).