GET /classify - Prefetch API

Classify a website

curl --request GET \
  --url https://api.prefetch.io/classify \
  --header 'X-API-Key: <api-key>'

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://api.prefetch.io/classify', 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.prefetch.io/classify",
  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-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://api.prefetch.io/classify"

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

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

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.prefetch.io/classify")

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

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

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

{
  "success": true,
  "data": {
    "url": "https://stripe.com",
    "iab_id": "IAB13-11",
    "iab_parent_id": "IAB13",
    "category": "Personal Finance",
    "subcategory": "Financial Planning",
    "description": "Stripe provides payment processing infrastructure for internet businesses.",
    "tagline_description": "Payment infrastructure for the internet.",
    "long_description": "Stripe provides payment processing infrastructure for internet businesses, enabling companies to accept payments, manage subscriptions, and handle global commerce operations.",
    "stock_tickers": [],
    "isins": []
  },
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

GET

classify

Classify a website

curl --request GET \
  --url https://api.prefetch.io/classify \
  --header 'X-API-Key: <api-key>'

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://api.prefetch.io/classify', 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.prefetch.io/classify",
  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-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://api.prefetch.io/classify"

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

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

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.prefetch.io/classify")

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

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

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

{
  "success": true,
  "data": {
    "url": "https://stripe.com",
    "iab_id": "IAB13-11",
    "iab_parent_id": "IAB13",
    "category": "Personal Finance",
    "subcategory": "Financial Planning",
    "description": "Stripe provides payment processing infrastructure for internet businesses.",
    "tagline_description": "Payment infrastructure for the internet.",
    "long_description": "Stripe provides payment processing infrastructure for internet businesses, enabling companies to accept payments, manage subscriptions, and handle global commerce operations.",
    "stock_tickers": [],
    "isins": []
  },
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

{
  "success": false,
  "error": "Credit limit exceeded",
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

Overview

/classify analyzes a website’s content and assigns it an IAB Content Taxonomy category. It returns:

IAB category — parent category (e.g. “Technology & Computing”)
IAB subcategory — more specific classification (e.g. “Software”)
Description — a short summary of what the site does
Tagline description — one-line tagline
Long description — extended multi-sentence description
Stock tickers — associated ticker symbols if the company is publicly traded
ISINs — associated ISIN security codes

This endpoint uses a hybrid approach: it first attempts a fast static fetch, falling back to headless Chrome only if the page requires JavaScript to render meaningful content.

Example request

curl "https://api.prefetch.io/classify?url=https://stripe.com" \
  -H "X-API-Key: $PREFETCH_API_KEY"

const res = await fetch(
  "https://api.prefetch.io/classify?url=https://stripe.com",
  { headers: { "X-API-Key": process.env.PREFETCH_API_KEY } }
);
const { success, data } = await res.json();
console.log(`${data.category} > ${data.subcategory}`);
// "Personal Finance > Financial Planning"

import requests, os

r = requests.get(
    "https://api.prefetch.io/classify",
    params={"url": "https://stripe.com"},
    headers={"X-API-Key": os.environ["PREFETCH_API_KEY"]},
)
data = r.json()["data"]
print(f"{data['category']} > {data['subcategory']}")

Example response

{
  "success": true,
  "data": {
    "url": "https://stripe.com",
    "iab_id": "IAB13-11",
    "iab_parent_id": "IAB13",
    "category": "Personal Finance",
    "subcategory": "Financial Planning",
    "description": "Stripe provides payment processing infrastructure for internet businesses.",
    "tagline_description": "Payment infrastructure for the internet.",
    "long_description": "Stripe provides payment processing infrastructure for internet businesses, enabling companies to accept payments, manage subscriptions, and handle global commerce operations.",
    "stock_tickers": [],
    "isins": []
  },
  "meta": {
    "requestId": "a3f2c1d4-7b6e-4f2a-9c1d-8e3f2a1b4c5d",
    "durationMs": 1842
  }
}

IAB taxonomy

The iab_id field follows the IAB Content Taxonomy 3.0 format:

IAB13 — parent category ID
IAB13-11 — subcategory ID (parent ID + hyphen + number)

Common parent categories include IAB19 (Technology & Computing), IAB3 (Business), IAB4 (Careers), and IAB13 (Personal Finance).

Authorizations

X-API-Key

string

header

required

Your Prefetch API key. Obtain one from the dashboard.

Query Parameters

url

string

required

The website URL to process. https:// is prepended automatically if no protocol is provided.

Example:

"https://stripe.com"

Response

Classification result.

success

enum<boolean>

required

Available options:

true

data

object

required

Show child attributes

​Overview

​Example request

​Example response

​IAB taxonomy

Authorizations

Query Parameters

Response

Overview

Example request

Example response

IAB taxonomy