OpenSRS Domains and TLS/SSL API

Wholesale reseller API for domain-name lookup, registration, transfer, renewal, DNS-zone management and TLS/SSL certificate ordering. An XML-over-HTTPS POST protocol authenticated with a reseller username and a double-MD5 request signature.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/opensrs-domains-and-tlsssl-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
name: OpenSRS Domains and TLS/SSL API
description: Wholesale reseller API for domain-name lookup, registration, transfer, renewal, DNS-zone
  management and TLS/SSL certificate ordering. An XML-over-HTTPS POST protocol authenticated with a reseller
  username and a double-MD5 request signature.
humanURL: https://domains.opensrs.guide
baseURL: https://rr-n1-tor.opensrs.net:55443
tags:
- Domains
- DNS
- SSL
- Registrar
properties:
- type: Documentation
  url: https://domains.opensrs.guide
- type: GettingStarted
  url: https://domains.opensrs.guide/docs/quickstart
- type: LLMsTxt
  url: llms/tucows-llms.txt