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GET
/
v1
/
users
List third-party users
curl --request GET \
  --url https://register.tariff.interop/v1/users \
  --header 'X-Supplier-API-Key: <api-key>'
import requests

url = "https://register.tariff.interop/v1/users"

headers = {"X-Supplier-API-Key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)
const options = {method: 'GET', headers: {'X-Supplier-API-Key': '<api-key>'}};

fetch('https://register.tariff.interop/v1/users', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://register.tariff.interop/v1/users",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "X-Supplier-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
package main

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

func main() {

	url := "https://register.tariff.interop/v1/users"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-Supplier-API-Key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.get("https://register.tariff.interop/v1/users")
  .header("X-Supplier-API-Key", "<api-key>")
  .asString();
require 'uri'
require 'net/http'

url = URI("https://register.tariff.interop/v1/users")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["X-Supplier-API-Key"] = '<api-key>'

response = http.request(request)
puts response.read_body
{
  "data": [
    {
      "user_id": "usr_c7e2f1a03b4d4e5f8a9b1c2d3e4f5a6b",
      "name": "Example Optimiser Ltd",
      "display_name": "Optimiser",
      "status": "active",
      "last_modified": "2026-10-15T08:30:00.000Z",
      "support": "tariff-support@optimiser.co.uk"
    }
  ]
}
{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}
{
  "code": "tariff_not_found",
  "message": "No tariff found for the given tariff_id and supplier MPID.",
  "details": "tariff_id a1b2c3d4-e5f6-7890-abcd-ef1234567890 does not exist for supplier SEBD."
}

Authorizations

​
X-Supplier-API-Key
string
header
required

API key issued to TI Energy Suppliers for accessing restricted register data and submitting performance reports. Credentials are valid for 2 years and are distributed via a one-time URL from the Code Manager.

Query Parameters

​
active
boolean

When true, returns only currently active RTI Users.

Example:

true

Response

A list of RTI User register entries.

​
data
object[]
Minimum array length: 1
Last modified on March 28, 2026