Tucows

Tucows is one of the world's largest internet-services and domain companies. Its OpenSRS division runs a wholesale reseller platform for domain-name registration, DNS, TLS/SSL certificates and hosted email, exposed through the OpenSRS API (an XML-over-HTTPS reseller protocol) and the OpenSRS Mail API (OMA). Tucows also operates Wavelo, a telecom BSS/OSS billing, provisioning and subscriber-management platform for communication service providers, and the Ting Internet fiber business. This profile captures the public OpenSRS developer surface — the domains/SSL API, the email provisioning API, authentication, error codes, sandbox, events and lifecycle. Tucows is a Union Square Ventures portfolio company.

Tucows publishes 2 APIs on the APIs.io network. Tagged areas include Company, Infrastructure, Domains, DNS, and SSL.

The Tucows catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Tucows’ developer surface includes documentation, API reference, getting-started guide, support, pricing, authentication, sandbox, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub

40.1/100 developing ▬ flat Agent 34/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessSelf serve

2 APIs 1 MCP Servers

CompanyInfrastructureDomainsDNSSSLEmailRegistrarTelecom

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 40.1/100 · developing

Contract Quality 9.6 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 6.5 / 17

Operational Transparency 2.0 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 5.2 / 15

Agent readiness — 34/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Regulatory Posture applies to this provider. Its tags matched the Telecommunications regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tucows: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

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 authenticat...

OpenSRS Email API (OMA)

The OpenSRS Mail API is the provisioning interface for the OpenSRS hosted email system — create, modify and delete mailboxes, aliases, domains and other aspects of the service. ...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Login

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

AgentSkill

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Lifecycle

Webhooks

Conformance

DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Deprecation

Deprecation

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: tucows
name: Tucows
description: Tucows is one of the world's largest internet-services and domain companies. Its OpenSRS division runs a wholesale
  reseller platform for domain-name registration, DNS, TLS/SSL certificates and hosted email, exposed through the OpenSRS
  API (an XML-over-HTTPS reseller protocol) and the OpenSRS Mail API (OMA). Tucows also operates Wavelo, a telecom BSS/OSS
  billing, provisioning and subscriber-management platform for communication service providers, and the Ting Internet fiber
  business. This profile captures the public OpenSRS developer surface — the domains/SSL API, the email provisioning API,
  authentication, error codes, sandbox, events and lifecycle. Tucows is a Union Square Ventures portfolio company.
url: https://raw.githubusercontent.com/api-evangelist/tucows/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- union-square-ventures
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://files.readme.io/fd0f1b4-small-OpenSRS_knowledgebase_1.png
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Infrastructure
- Domains
- DNS
- SSL
- Email
- Registrar
- Telecom
apis:
- 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
- name: OpenSRS Email API (OMA)
  description: The OpenSRS Mail API is the provisioning interface for the OpenSRS hosted email system — create, modify and
    delete mailboxes, aliases, domains and other aspects of the service. A stateless web service where each interaction is
    a single HTTP request/response.
  humanURL: https://email.opensrs.guide
  baseURL: https://admin.hostedemail.com/api
  tags:
  - Email
  properties:
  - type: Documentation
    url: https://email.opensrs.guide
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 13
  pass: local-v1
common:
- type: Website
  url: https://tucows.com
- type: DeveloperPortal
  url: https://opensrs.com
- type: Documentation
  url: https://domains.opensrs.guide
- type: APIReference
  url: https://domains.opensrs.guide/docs/quickstart
- type: GettingStarted
  url: https://domains.opensrs.guide/docs/quickstart
- type: Support
  url: https://support.opensrs.com/support/home
- type: GitHubOrganization
  url: https://github.com/tucows
- type: StatusPage
  url: https://status.opensrs.com
- type: Pricing
  url: https://opensrs.com/domains/pricing/
- type: Login
  url: https://manage.opensrs.com
- type: PrivacyPolicy
  url: https://opensrs.com/privacy-policy/
- type: TermsOfService
  url: https://opensrs.com/payment-terms/
- type: LLMsTxt
  url: llms/tucows-llms.txt
- type: Authentication
  url: authentication/tucows-authentication.yml
- type: ErrorCatalog
  url: errors/tucows-problem-types.yml
- type: Conventions
  url: conventions/tucows-conventions.yml
- type: Lifecycle
  url: lifecycle/tucows-lifecycle.yml
- type: Deprecation
  url: lifecycle/tucows-lifecycle.yml
- type: Sandbox
  url: sandbox/tucows-sandbox.yml
- type: MCPServer
  url: mcp/tucows-mcp.yml
- type: Webhooks
  url: asyncapi/tucows-opensrs-domains-events.yml
- type: Conformance
  url: conformance/tucows-conformance.yml
- type: DataModel
  url: data-model/tucows-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/tucows-domain-security.yml

Tucows

Kin Score

APIs 2

OpenSRS Domains and TLS/SSL API

OpenSRS Email API (OMA)

MCP Servers 1

Tucows MCP Server

Event Specifications 1

Tucows Opensrs Domains Events

Security Posture 2

Tucows Authentication

Tucows Domain Security

Resources