OPENSRS API

Your product. Now with domains,
site security, and email built in.

Your product. Now with domains, site security, and email built in.

Whether you're building your first product or scaling an existing one, the OpenSRS APIs integrate seamlessly with what you’ve built.

Talk to our team

Trusted by some of the world's largest platforms.

Python

Perl

Java

PHP

Ruby

OpenSRS API Quickstart

1#!/usr/bin/python
2 
3import requests
4import hashlib
5 
6TEST_MODE = 1
7 
8connection_options = {
9        'live' : {
10         # IP whitelisting required
11             'reseller_username': '<YOUR RESELLER USERNAME>',
12             'api_key':'<YOUR API KEY>',
13             'api_host_port': 'https://rr-n1-tor.opensrs.net:55443',
14        },
15        'test' : {
16             # IP whitelisting not required
17             'reseller_username': '<YOUR RESELLER USERNAME>',
18             'api_key':'<YOUR API KEY>',
19             'api_host_port': 'https://horizon.opensrs.net:55443',
20 
21        }
22}
23 
24if TEST_MODE == 1:
25    connection_details = connection_options['test']
26else:
27    connection_details = connection_options['live']
28 
29xml = '''
30<?xml version='1.0' encoding='UTF-8' standalone='no' ?>
31<!DOCTYPE OPS_envelope SYSTEM 'ops.dtd'>
32<OPS_envelope>
33<header>
34    <version>0.9</version>
35</header>
36<body>
37<data_block>
38    <dt_assoc>
39        <item key="protocol">XCP</item>
40        <item key="action">LOOKUP</item>
41        <item key="object">DOMAIN</item>
42        <item key="attributes">
43         <dt_assoc>
44                <item key="domain">myfirstopensrsapitest.com</item>
45         </dt_assoc>
46        </item>
47    </dt_assoc>
48</data_block>
49</body>
50</OPS_envelope>
51'''
52 
53md5_obj = hashlib.md5()
54md5_obj.update((xml + connection_details['api_key']).encode())
55signature = md5_obj.hexdigest()
56 
57md5_obj = hashlib.md5()
58md5_obj.update((signature + connection_details['api_key']).encode())
59signature = md5_obj.hexdigest()
60 
61headers = {
62        'Content-Type':'text/xml',
63        'X-Username': connection_details['reseller_username'],
64        'X-Signature':signature,
65};
66 
67print("Request to {} as reseller {}:".format(connection_details['api_host_port'],connection_details['reseller_username']))
68print(xml)
69 
70r = requests.post(connection_details['api_host_port'], data = xml, headers=headers )
71 
72print("Response:")
73if r.status_code == requests.codes.ok:
74    print(r.text)
75else:
76    print (r.status_code)
77    print (r.text)

Your product. Your checkout. Your customer.

Your product.
Your checkout.
Your customer.

Your customers are building businesses, agents, stores, tools, and sites inside your product. Give them everything they need to launch from the same place.

With the OpenSRS APIs, you can sell and manage domains, website security (TLS/SSL certificates), and professional email under your brand — powered by infrastructure built to scale.

Every domain your customer registers elsewhere is a gap in your product.

Without OpenSRS

Customer leaves your platform to register a domain, purchase site security (TLS/SSL certificates), and email

Third-party checkout, third-party brand

Someone else owns the launch moment

Support gets fragmented

With OpenSRS

Customer does it all inside your product

Your checkout, your brand

You own the relationship

Your product stays at the center of the experience

Two dedicated APIs. One partner.

OpenSRS offers two APIs—one for domain registration and TLS/SSL certificates, one for email hosting. Use them together or separately. Either way, your customers only ever see you.

Domains + TLS/SSL API

The full domain and TLS/SSL certificate experience, built into your product and branded as yours.

Best for AI app builders, website builders, e-commerce platforms, SaaS tools, hosting platforms, and marketplaces that want to own the domain experience.

Domain search and registration inside your product

TLS/SSL certificate purchase and provisioning

750+ TLDs, including premium domains

Full automation: registrations, renewals, transfers, and WHOIS updates

XML-based API that works with whatever stack you're building on

Email API

White-label professional email that lives inside your product, not someone else’s.

Best for platforms that want to help customers look legit from day one with addresses like hello@theirbrand.com.

Mailbox creation and management

Branded business email for customers’ domains

Bulk create, manage, and delete actions

IMAP, POP3, and SMTP support

JSON-based API that works with any stack

Why OpenSRS? A partner built for builders

Infrastructure that’s been running since before “the cloud” was a thing. 25+ years. Millions of domains. Millions of mailboxes.

We're the infrastructure. Not the competition.

We never compete for your customers. They search for a domain inside your product. We're the infrastructure powering it.

No minimums, no ceilings.

Transparent pricing.

Wholesale prices for all TLDs are on our site. No surprises. Tiered pricing grows with your volume.

Support that meets you where you are.

Documentation, code examples, and a team that helps builders go from integration to launch.

Your users are ready to launch. Don’t send them somewhere else.

Add domains, hosted email, and TLS/SSL to your product with OpenSRS APIs. Speak with our sales team to get started.

TESTIMONIAL

ikas is an e-commerce platform helping small businesses build and scale online stores.

“We were able to complete the API integration very quickly and without needing direct support from the team. The API was straightforward to work with, and the documentation made the process clear and easy to follow. At the same time, it was reassuring to know that support was available if we needed anything during the integration. Overall, the experience felt smooth, lightweight, and easy to build on.”

Ömercan Çelikler, Co-Founder & Head of Product — IKAS

Your product. Now with domains,
site security, and email built in.

Your product. Now with domains, site security, and email built in.

Your product. Now with domains, site security, and email built in.

Your product. Your checkout. Your customer.

Your product.
Your checkout.
Your customer.

Every domain your customer registers elsewhere is a gap in your product.

Without OpenSRS

With OpenSRS

Two dedicated APIs. One partner.

Domains + TLS/SSL API

Email API

Why OpenSRS? A partner built for builders

We're the infrastructure. Not the competition.

No minimums, no ceilings.

Transparent pricing.

Support that meets you where you are.

Your users are ready to launch. Don’t send them somewhere else.

ikas is an e-commerce platform helping small businesses build and scale online stores.

Frequently Asked Questions

Do I need to be a developer to integrate the API?

Is there a testing environment?

Are there usage limits?

Are the two APIs different technically?

How does pricing work?

The API doesn't feel like the right fit — what else should I consider?

Your product. Now with domains,site security, and email built in.

Your product. Now with domains, site security, and email built in.

Your product. Now with domains, site security, and email built in.

Your product. Your checkout. Your customer.

Your product.Your checkout.Your customer.

Every domain your customer registers elsewhere is a gap in your product.

Without OpenSRS

With OpenSRS

Two dedicated APIs. One partner.

Domains + TLS/SSL API

Email API

Why OpenSRS? A partner built for builders

We're the infrastructure. Not the competition.

No minimums, no ceilings.

Transparent pricing.

Support that meets you where you are.

Your users are ready to launch. Don’t send them somewhere else.

ikas is an e-commerce platform helping small businesses build and scale online stores.

Frequently Asked Questions

Do I need to be a developer to integrate the API?

Is there a testing environment?

Are there usage limits?

Are the two APIs different technically?

How does pricing work?

The API doesn't feel like the right fit — what else should I consider?

Your product. Now with domains,
site security, and email built in.

Your product.
Your checkout.
Your customer.