Email Check API — CUB SOFTWARE Developer

Base URL

Base https://cubsoftware.site

Authentication

No API key required — this endpoint is publicly accessible.

Please include a descriptive User-Agent header identifying your app.

Email Check

GET /api/validate/email Validation

Whether an address is well-formed. Format only.

Parameter	Type	Required	Description
email	string	required	The address to check the format of.

Example Response

{
  "email": "[email protected]",
  "note": "Format only — deliverability cannot be checked without sending.",
  "valid_format": true
}

curl 'https://cubsoftware.site/api/validate/[email protected]'
const res  = await fetch('https://cubsoftware.site/api/validate/[email protected]');
const data = await res.json();
console.log(data.valid_format);
const https = require('https');

https.get('https://cubsoftware.site/api/validate/[email protected]', (res) => {
    let body = '';
    res.on('data', chunk => body += chunk);
    res.on('end', () => {
        const data = JSON.parse(body);
        console.log(data.valid_format);
    });
});
import requests

res  = requests.get('https://cubsoftware.site/api/validate/[email protected]')
data = res.json()
print(data['valid_format'])
<?php
$res  = file_get_contents('https://cubsoftware.site/api/validate/[email protected]');
$data = json_decode($res, true);
echo $data['valid_format'];
package main

import (
    "encoding/json"
    "fmt"
    "io"
    "net/http"
)

func main() {
    resp, _ := http.Get("https://cubsoftware.site/api/validate/[email protected]")
    defer resp.Body.Close()
    body, _ := io.ReadAll(resp.Body)
    var data map[string]any
    json.Unmarshal(body, &data)
    fmt.Println(data["valid_format"])
}
using System.Net.Http.Json;

var client = new HttpClient();
var data   = await client.GetFromJsonAsync<Dictionary<string, object>>(
    "https://cubsoftware.site/api/validate/[email protected]"
);
Console.WriteLine(data["valid_format"]);
import java.net.URI;
import java.net.http.*;
import java.util.Map;
import com.fasterxml.jackson.databind.ObjectMapper;

var client = HttpClient.newHttpClient();
var req    = HttpRequest.newBuilder()
    .uri(URI.create("https://cubsoftware.site/api/validate/[email protected]"))
    .build();
var res  = client.send(req, HttpResponse.BodyHandlers.ofString());
var data = new ObjectMapper().readValue(res.body(), Map.class);
System.out.println(data.get("valid_format"));
require 'net/http'
require 'json'

uri  = URI('https://cubsoftware.site/api/validate/[email protected]')
data = JSON.parse(Net::HTTP.get(uri))
puts data['valid_format']

Try It

Live request

Edit the path and send it. This runs against the real endpoint.

Press Send to run the request.

Rate Limits

10 requests per second per IP, across every endpoint.

Going over returns 429 — back off and retry.

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