Kickbox alternatives
Kickbox is an email verification API that returns deliverable, undeliverable, risky or unknown plus a 0 to 1 Sendex quality score, with official libraries for PHP, Node.js, Ruby and Python. The services below are the other options in the same category, each with the figures its own public pages state as of 2026-09-03. Spaw is listed first because this is Spaw's site; the side-by-side comparison has the full table.
| service | pricing model | free tier | price per 1,000 at ~10k |
|---|---|---|---|
| Spaw | Pay-as-you-go credit packs bought through Stripe Checkout; no subscription, credits never expire | 10 free credits every month, no card required | $7.80 (Growth pack: 5,000 credits for $39) |
| Abstract API | Monthly subscription tiers with a request slider from 5,000 to 150,000 requests a month; Starter from $17, Standard from $37, Professional from $39 a month | 100 requests a month | not published |
| Bouncer | Pay-as-you-go credits that never expire (minimum 1,000 credits for $8), auto-refill, plus a Deliverability Kit subscription at $25 to $250 a month | 100 free credits, no card required | $6.00 (10,000 credits for $60) |
| Emailable | Pay-as-you-go credits that never expire, or a monthly subscription at a 15% discount; minimum purchase 5,000 credits | 250 free credits at signup | $7.60 (pay-as-you-go at $0.0076 a credit; a 10K monthly subscription costs $32.30) |
| Hunter | Monthly or yearly subscriptions with unified credits shared across search, verification and enrichment; credit packs on paid plans (valid 3 months) | Free plan with 50 credits a month; one verification costs 0.5 credit, so 100 verifications | $7.45 (Growth: $149 a month for 10,000 credits, 20,000 verifications at 0.5 credit each; $5.20 billed yearly) |
| Mailboxlayer | Monthly or yearly subscription with a request quota per plan and per-request overage | 100 requests a month | $3.00 (Basic: 5,000 requests for $14.99 a month, overage $0.012 a request; Professional Plus: 50,000 for $74.99, $1.50 per 1,000) |
| NeverBounce | not published | not published | not published |
| Verifalia | Pay-as-you-go credit packs that never expire, or monthly, quarterly and yearly subscriptions; verification depth is priced as quality levels | 25 free credits a day on the Free plan; unused daily credits expire each day | not published |
| ZeroBounce | Pay-as-you-go credits that never expire, or the ZeroBounce ONE subscription; volume pricing shown through a calculator rather than fixed packs | 100 validation credits a month on the free account | not published |
Spaw
Email verification API that bills per answered lookup: syntax, live MX, SPF and DMARC, disposable and role lists, and an SMTP mailbox handshake that never sends a message.
Developers who want one flat price per answered lookup, a transparent risk score, and an API that documents every field.
Abstract API
Abstract API's email validation endpoint is one of a family of utility APIs sold as monthly request quotas with a free 100-request plan.
Developers who want one vendor for several small utility APIs under a monthly quota.
Bouncer
Bouncer is an email verification service with pay-as-you-go credits that never expire, high-throughput batch APIs, a real-time form product (Bouncer Shield) and a Deliverability Kit subscription.
Teams that want the lowest published per-check price with high batch throughput and a real-time form product.
Emailable
Emailable is an email verification service with pay-as-you-go credits, a bulk verifier, a widget and an API, with Node.js, Ruby and Python libraries.
Marketers who want a simple per-credit price, a fast bulk cleaner and a stated 30-day deletion policy.
Hunter
Hunter is an outreach platform whose Email Verifier shares unified plan credits with its email finder, enrichment and campaign tools.
Sales teams that prospect with Hunter's finder and campaigns and verify addresses as part of that workflow.
Mailboxlayer
Mailboxlayer is apilayer's email validation API, sold as monthly request quotas from a free 100-request plan up to 250,000 requests a month.
Developers who prefer a flat monthly quota and already use other apilayer APIs.
NeverBounce
NeverBounce is a ZoomInfo-owned email verification service with a bulk list-cleaning workflow, a real-time API and official client libraries in six languages.
Teams that clean large lists through jobs and want official wrappers in six languages plus an n8n node.
Verifalia
Verifalia is an email verification service with selectable quality levels, credit packs that never expire, subscriptions with daily free credits, and official SDKs in six languages.
Developers who want to tune verification depth per request, official SDKs in six languages, and configurable retention.
ZeroBounce
ZeroBounce is an email validation service with a pay-as-you-go credit model and a subscription (ZeroBounce ONE) that bundles deliverability tools such as activity data, inbox placement tests and blacklist monitoring.
Marketing teams that want a deliverability suite around verification and prefer a subscription with bundled tools.
Start with the free grant
Every Spaw account gets 10 free lookups a month with no card. Verify a sample from your list and compare the verdicts before you commit to anything.
Kickbox and the other product names are trademarks of their owners. Spaw is not affiliated with them. Markdown version: /alternatives/kickbox.md