Kickbox
Verification API for product teams.
From $5/500 verifications Free tier API
Bottom line
Email verification sold as pay-as-you-go packs, with 100 free checks to start. The smallest paid pack is $5 for 500 verifications.
Stands out for: Unknown results are refunded as credits, so you do not pay for a check that returns no clear answer.
Watch out for: Packs are paid upfront, not billed monthly. Very large volumes move to custom pricing through sales.
Overview
Kickbox verifies email lists and single addresses through a web app and a real-time API. Pricing is pay-as-you-go packs in USD: 100 verifications are free, then 500 cost $5, 1,000 cost $10 and 2,500 cost $25, with larger packs up to 1 million and custom pricing above that. Unknown results are refunded as credits. Kickbox is SOC 2 certified and GDPR compliant.
Teams pick Kickbox for a small first purchase and a well documented API. The docs cover single and batch verification, a sandbox mode, auto recharge and a threat score. Kickbox connects to email and CRM tools including HubSpot, Salesforce, Mailchimp, Klaviyo, Braze, Marketo and SendGrid, plus Zapier. Signup is free and needs no card, and the 100 free verifications are a one-time allowance.
Who it's for
Best for
- Senders who want 100 free checks with no card
- Small teams that start with a $5 pack
- Developers verifying emails at signup via the API
- Teams syncing lists from HubSpot or Mailchimp
Not ideal for
- Buyers who want a flat monthly subscription
- Teams that need lead search and verification together
Key features
Sendex. Sendex-style sending identity / infra features.
API. Documented API for jobs, candidates, and stage sync.
Pricing
Pay-as-you-go packs: 500 verifications for $5, 1,000 for $10 and 2,500 for $25, with larger packs up to 1 million and custom pricing above that. The first 100 verifications are free, and unknown results are refunded. Confirm current terms on the vendor site.
Checked 19 Sep 2026. Vendors change prices without notice.
Is Kickbox expensive?
Kickbox starts at $5/500 verifications. We list 32 verification tools in total. 12 have a free tier, and those with a public price typically start around $35 a month.
- 1 quote-based
- 12 free tier
- 31 public price
Worked out automatically from every verification listing, so it updates as the directory changes.
Pros and cons
Pros
- 100 free verifications, no card
- Paid packs from $5 for 500
- Unknown results refunded
Cons
- Upfront packs, no monthly plan
- Top volumes need a custom quote
- Verification only, no lead finder
Integrations
HubSpot Salesforce Mailchimp Klaviyo Zapier Braze Marketo SendGrid
What's new at Kickbox
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How Kickbox compares
See all Kickbox alternatives, with what each one does differently and a head to head for every pairing.
| Tool | Free tier | From | MCP | API | Compare |
|---|---|---|---|---|---|
| | ✓ | $5/500 verifications | – | ✓ | |
| | – | $39/10k credits | – | ✓ | Compare |
| | ✓ | $39/2,000 credits | ✓ | ✓ | Compare |
| | – | $8/1,000 credits | – | ✓ | Compare |
| | ✓ | $0.00045/check | – | ✓ | Compare |
$39/10k credits API
Cheaper per email if your first list is 10,000 or more.
$39/2,000 credits Free tier MCP API
Another pack-based verifier with list scoring tools.
$8/1,000 credits API
Pay-as-you-go verification with a real-time API.
$0.00045/check Free tier API
Low-cost credit verifier if price per email matters most.
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