Thunderproxy provides residential, static ISP and datacenter proxies through one gateway. When a CAPTCHA provider or protection system associates a challenge with the visitor’s IP address, CaptchaAI must solve it through the same proxy used to load and submit the page. Otherwise, a correct token can still be rejected.

This guide shows how to choose a Thunderproxy product, build the proxy credentials, enable proxy use in CaptchaAI and keep one IP throughout the complete flow.

Last updated: September 22, 2026

All three products use the same gateway. You switch products by changing the username suffix rather than rebuilding the integration.

Residential is the usual starting point when address reputation matters. Static ISP is appropriate when the same identity must keep one address for longer workflows. Datacenter offers the lowest cost and faster routing when the target does not require a residential network.

Some challenge systems associate a token with the IP address that requested it. In that case, three steps must use the same address:

Cloudflare documents that Turnstile tokens are valid for 300 seconds and can be validated only once. Completing the flow promptly and keeping one address throughout it avoids an IP mismatch or an expired token.

Not every CAPTCHA needs a proxy. CaptchaAI recommends using one when the target enforces IP matching, while simple image, text or audio tasks generally do not benefit from the additional connection.

Thunderproxy serves HTTP and SOCKS5 connections from the same host:

HTTP: gw.thunderproxy.net:5959

SOCKS5: gw.thunderproxy.net:9595

The product, target country and session mode are encoded in the username:

YOUR_USERNAME-res-US residential, US exit, rotates per request

YOUR_USERNAME-res-US-sid-12345678 residential, US exit, sticky session

YOUR_USERNAME-res-US-sid-12345678-ttl-300 sticky session with a 300-second TTL

YOUR_USERNAME-dc-DE-sid-30590266 datacenter, German exit, sticky session

YOUR_USERNAME-stc-isp-sid-1 first dedicated static ISP address

Use a two-letter uppercase country code such as US or DE. The -sid- suffix requires an eight-digit session ID. Reusing that username keeps requests on the same address, subject to peer availability for residential connections. A 300-second TTL is a practical default for a short challenge flow.

The Quick Access configurator in the Thunderproxy dashboard assembles the complete credential string, so you can copy the host, port and suffix order directly.

The Quick Access configurator shows the selected protocol and generates the complete proxy string.

Country and state targeting can also be selected in the dashboard before copying the generated credentials.

Country and state targeting with Sticky mode and a 300-second TTL.

Before sending a proxy-based task, sign in to CaptchaAI and open captchaai.com/config. Enable proxy usage from your account settings. You do not need to contact support to activate it.

CaptchaAI expects the proxy value without a URL scheme:

YOUR_USERNAME-res-US-sid-12345678-ttl-300:[email protected]:5959

Set proxytype to match the protocol and port you selected. Use HTTP with port 5959 or SOCKS5 with port 9595.

The following example submits a reCAPTCHA v2 task through one sticky residential address. It focuses only on the proxy-related fields; keep your existing polling and error handling around the request.

import random

import requests

API_KEY = "YOUR_CAPTCHAAI_API_KEY"

SITE_KEY = "SITE_RECAPTCHA_KEY"

PAGE_URL = "https://target-site.com/form"

session_id = random.randint(10000000, 99999999)

username = f"YOUR_USERNAME-res-US-sid-{session_id}-ttl-300"

proxy_value = (

f"{username}:YOUR_PASSWORD@"

"gw.thunderproxy.net:5959"

)

response = requests.post(

"https://ocr.captchaai.com/in.php",

data={

"key": API_KEY,

"method": "userrecaptcha",

"googlekey": SITE_KEY,

"pageurl": PAGE_URL,

"proxy": proxy_value,

"proxytype": "HTTP",

"json": 1,

},

timeout=30,

)

print(response.json())

Load the target page and submit the finished token through the same sticky username. Do not generate a new session ID between those steps. If you use a dedicated static ISP address, select the same -stc-isp-sid-N index for the entire flow.

Before spending a solve, you can verify the address with:

curl -x "http://YOUR_USERNAME-res-US-sid-12345678:[email protected]:5959" https://ip-api.com/json

For a larger list, the free proxy checker reports connection status, response time, exit IP and location.

At the 25 GB tier, rotating residential costs $47.37, or $1.89 per GB, when coupon CAPTCHAAI50 is applied at checkout. Rotating datacenter at the same tier costs $32.25, or $1.29 per GB. Static ISP addresses start at $1.79 per IP. These prices were checked on September 22, 2026.

No. Use a proxy when the target associates the challenge with the visitor’s IP address. In that situation, the page load, solve and token submission must share one address. Basic image, text and audio tasks generally do not require a proxy.

Use a sticky residential session or a static ISP address for any multi-step flow. A fully rotating username may return a different address on each request, which breaks the match between the visitor that received the challenge and the visitor that submits the token.

Yes. Use gw.thunderproxy.net:9595 and set CaptchaAI’s proxytype field to SOCKS5. For HTTP connections, use port 5959 and set proxytype to HTTP.

Sign in and open https://captchaai.com/config. Enable proxy usage in your account settings before submitting the first proxy-based task. The option is self-service, so no support request is required.

Create a Thunderproxy account, apply coupon code CAPTCHAAI50, generate a sticky proxy in Quick Access and verify its exit IP before sending your first CaptchaAI task.

This guide was written by the team at Thunderproxy, a proxy network offering rotating residential, static ISP and rotating datacenter IPv4 proxies through one gateway, with location targeting and sticky sessions.