Overview
Kickbox provides a free, no-auth email verification endpoint that checks whether an email address is deliverable by performing syntax validation, domain MX lookup, and disposable address detection. The open endpoint at open.kickbox.com requires no API key and returns a quick binary verdict, while paid plans offer deeper SMTP verification. It is commonly used in form validation to catch bad emails at point of entry.
Beginner Tip
Kickbox open endpoint needs no API key — just append an email address to the URL and you get an immediate JSON response. It is one of the easiest ways to add basic email validation to a signup form without any registration.
Measurement Record
What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.
- Request
- GET https://open.kickbox.com/v1/disposable/[email protected]
- Result
- HTTP 200 · application/json · 19 bytes
- Response time
- 201 ms (median of 3) · fastest 199 ms
- Transport
- TLSv1.3 · TLS_AES_128_GCM_SHA256 · certificate issued by Amazon
- Browser CORS
- Allowed — Access-Control-Allow-Origin: https://apisscore.com
- Recorded
- 2026-08-10
Fields Returned
Top-level fields present in the response we captured, with the type and value we actually received.
| Field | Type | Value received |
|---|---|---|
| disposable | boolean | true |
Captured Response
Captured from a real request to https://open.kickbox.com/v1/disposable/[email protected] on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.
{
"disposable": true
} Field Reference
disposable True if the email domain is a known temporary or disposable email provider Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://open.kickbox.com/v1/disposable/[email protected]"; const response = await fetch(url); if (!response.ok) throw new Error(`Request failed: ${response.status}`); const data = await response.json(); console.log(data);
What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.
Measured Score Breakdown
Live HTTP request to the API endpoint
Fully tested on Aug 10, 2026
Technical Specifications
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Email Validation
Abstract API Email Validation checks whether an email address is deliverable, properly formatted, and not from a disposable or spam-trap domain.