List Classifications

List all Nice classification classes with descriptions

GET /v1/classifications

List Classifications

cURL

curl --request GET \
  --url https://api.signa.so/v1/classifications \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.signa.so/v1/classifications"

headers = {"Authorization": "Bearer <token>"}

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

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.signa.so/v1/classifications', 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://api.signa.so/v1/classifications",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($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://api.signa.so/v1/classifications"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.signa.so/v1/classifications")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.signa.so/v1/classifications")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body

{
  "object": "list",
  "data": [
    {
      "class_number": 25,
      "object": "classification",
      "title": "Clothing, footwear, headwear",
      "description": "Clothing, footwear, headwear",
      "category": "goods"
    },
    {
      "class_number": 35,
      "object": "classification",
      "title": "Advertising; business management, organization and administration; office functions",
      "description": "Advertising; business management, organization and administration; office functions.",
      "category": "services"
    }
  ],
  "has_more": false,
  "pagination": {
    "cursor": null
  }
}

Overview

Returns the complete Nice Classification system used to categorize goods and services in trademark applications. Each class includes its number, title, and description. The Nice Classification is maintained by WIPO and updated annually; Signa always reflects the current edition.

This reference endpoint is useful for building class pickers, validating user input, and displaying human-readable class descriptions alongside trademark data.

Query Parameters

type · string

Filter by classification type: goods (classes 1-34) or services (classes 35-45).

q · string

Search classification titles, descriptions, and terms (case-insensitive contains, max 200 characters).

limit · integer · default: "100"

Max results per page (max 500). The default returns all 45 classes in one page.

cursor · string

Pagination cursor from pagination.cursor of the previous page.

Response

This endpoint is publicly cacheable, so the response never includes request_id.

object · string

Always list.

data · object[]

Show Classification object

class_number · integer

Nice class number (1-45)

object · string

Always classification

title · string

Official Nice class heading, the full title string published by WIPO

description · string

Full Nice class scope description

category · string

goods (classes 1-34) or services (classes 35-45)

has_more · boolean

Whether more pages are available.

pagination · object

Show Pagination

cursor · string | null

Cursor for the next page, or null on the last page.

{
  "object": "list",
  "data": [
    {
      "class_number": 25,
      "object": "classification",
      "title": "Clothing, footwear, headwear",
      "description": "Clothing, footwear, headwear",
      "category": "goods"
    },
    {
      "class_number": 35,
      "object": "classification",
      "title": "Advertising; business management, organization and administration; office functions",
      "description": "Advertising; business management, organization and administration; office functions.",
      "category": "services"
    }
  ],
  "has_more": false,
  "pagination": {
    "cursor": null
  }
}

Code Examples

cURL

curl "https://api.signa.so/v1/classifications?type=services" \
  -H "Authorization: Bearer sig_YOUR_KEY"

import { Signa } from "@signa-so/sdk";

const signa = new Signa({ api_key: process.env.SIGNA_API_KEY });

const classifications = await signa.references.classifications({ q: "software" });

Errors

Status	Type	Description
400	validation_error	Invalid type parameter
401	unauthorized	Missing or invalid API key
403	forbidden	API key lacks trademarks:read scope
429	rate_limited	Too many requests

Related Endpoints

• Get Classification, single class detail
• Suggest Classifications, AI-assisted class suggestion from a description
• Suggest Goods & Services, draft filing-ready wording per class
• List Goods & Services, browse and search the pre-approved term catalog
• List Trademarks, filter or search by Nice class