List domains

GET/api/v2/domains

The workspace's sending domains and whether MX, SPF, DKIM and DMARC are confirmed for each.

Needs an API key with the newsletter scope. Scopes

Notes

ready is true when the domain can send and receive.
Needs read.

curl -X GET "https://api.koltrix.com/api/v2/domains" \
  -H "Authorization: Bearer $KOLTRIX_API_KEY"

const res = await fetch("https://api.koltrix.com/api/v2/domains", {
  method: "GET",
  headers: {
    Authorization: `Bearer ${process.env.KOLTRIX_API_KEY}`,
  },
});

console.log(res.status, await res.json());

import os, requests

res = requests.get(
    "https://api.koltrix.com/api/v2/domains",
    headers={
        "Authorization": f"Bearer {os.environ['KOLTRIX_API_KEY']}",
    },
)
print(res.status_code, res.json())

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.koltrix.com/api/v2/domains", nil)
	req.Header.Set("Authorization", "Bearer "+os.Getenv("KOLTRIX_API_KEY"))

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	out, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(out))
}

<?php

$ch = curl_init("https://api.koltrix.com/api/v2/domains");
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST => "GET",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        "Authorization: Bearer " . getenv("KOLTRIX_API_KEY"),
    ],
]);

$response = curl_exec($ch);
echo curl_getinfo($ch, CURLINFO_HTTP_CODE), " ", $response;

Success.

{
  "data": [
    {
      "domain": "acme.com",
      "ready": true,
      "mx": true,
      "spf": true,
      "dkim": true,
      "dmarc": true,
      "last_checked_at": "2026-10-22T08:00:00Z"
    }
  ]
}

The API key is missing, malformed, unknown or revoked.

{
  "error": "invalid or revoked api key"
}

The key is valid but does not have the newsletter scope.

{
  "error": "missing permission: newsletter"
}

More than 60 requests a minute on this key. Wait Retry-After seconds. No code field.

Retry-After: 60

{
  "error": "rate limit exceeded — 60 requests per minute per API key"
}

Try it below with your own key. Every sample reads the key from KOLTRIX_API_KEY.

Try it

Send this request from your browser.

Input

What you send

API key

Stays in this browser tab (sessionStorage) and goes only to api.koltrix.com. Create one under Settings → API keys.

Requests are real. Koltrix has no test mode, so use a dedicated key with only the permissions you need and revoke it when you are done.

GEThttps://api.koltrix.com/api/v2/domains

Output

What comes back

The response appears here.
Press Send request.