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
43.0/100 thin ▬ flat Agent 39/100 agent aware Full breakdown ↓
scored 2026-07-23 · rubric v0.5
AccessSelf serve
2 APIs 1 MCP Servers
CompanyInfrastructureDomainsDNSSSLEmailRegistrarTelecom

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-23 · rubric v0.5
Composite quality — 43.0/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 14.3 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 39/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 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
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.

tucows-mcp.yml

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Tucows Opensrs Domains Events

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Tucows Authentication

apiKey/signature · 2 schemes

SECURITY

Tucows Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Login
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
ErrorCatalog
 Conventions
Conventions
 Lifecycle
Lifecycle
 Webhooks
Webhooks
 Conformance
Conformance
 DataModel
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)

apis.yml Raw ↑ 
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: '0.20'
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