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Head-to-head · Domain Registration APIs

OpenSRS vs Ascio API

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score OpenSRS #4 in Domain Registration APIs 8.9/10 Free plan Free plan✓ 0 of 6 features Visit OpenSRS
Ascio API #7 in Domain Registration APIs 8.6/10 Pricing on request ✓ 5 of 6 features Visit Ascio

OpenSRS leads on 0 checks, Ascio API on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOpenSRS · 8.9/10
  • Free planonly OpenSRS
  • Most featuresAscio API · 5 of 6

OpenSRS scores higher on our rubric for domain registration apis: 8.9 against 8.6 out of 10; our editors rank them #4 and #7.

OpenSRS is the better fit for established resellers wanting storefront and APIs. Ascio API is the better fit for mature partners needing registry-specific automation.

  • OpenSRS fits best

    Established resellers wanting storefront and APIs

  • Ascio API fits best

    Mature partners needing registry-specific automation

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Side by side

Feature OpenSRS 8.9/10 Visit ↗ Ascio API 8.6/10 Visit ↗
At a glance
Editor score 8.9 8.6
Ranking #4 in Domain Registration APIs #7 in Domain Registration APIs
Best for Established resellers wanting storefront and APIs Mature partners needing registry-specific automation
Pricing model Free plan + paid Paid
Starting price — Pricing on request
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Live chat, Phone, Tickets, Docs · 24/7 Email, Live chat, Phone, Tickets, Docs
Integrations 12 integrations 7 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features OpenSRS 0/6 · Ascio API 5/6
Domain search API Not checked yet ✓ (best)
Bulk registration Not checked yet Not checked yet
Transfer management Not checked yet ✓ (best)
Renewal management Not checked yet ✓ (best)
Premium domains Not checked yet ✓ (best)
Sandbox environment Not checked yet ✓ (best)
Our review
Pros
  • Domain, TLS/SSL, DNS, transfer, renewal, and management APIs
  • White-label Storefront with customer self-service portals
  • Bulk operations, WHMCS modules, Stripe, and reseller integrations
  • Covers availability, registration, transfers, renewals, and premium domains
  • TLD Kit addresses registry-specific requirements across multiple TLDs
  • Includes DNS, portfolio tools, asynchronous processing, and partner integrations
Cons
  • Pricing varies by TLD and reseller tier
  • The platform is oriented toward reseller and platform businesses
  • Advanced capabilities require choosing among multiple pricing tiers
  • Pricing requires a conversation with sales
  • SOAP-based interfaces may require specialized implementation work
  • Asynchronous orders require message handling and polling workflows
Our verdict

OpenSRS is Tucows’ wholesale domain reseller platform for hosting companies, website builders, ecommerce platforms, agencies, software companies, and internet service providers. It supports domain registration, transfers, renewals, DNS…

Read the review →

Ascio API is a domain registration and management service from Ascio Technologies, designed for domain resellers and partners operating across multiple top-level domains. Its SOAP-based interfaces cover availability checks, registration…

Read the review →
  1. OpenSRSDomain Registration APIs 8.9Free plan
  2. Ascio APIDomain Registration APIs 8.6Pricing on request

Strengths and trade-offs

  • OpenSRS — where it wins

    • Domain, TLS/SSL, DNS, transfer, renewal, and management APIs
    • White-label Storefront with customer self-service portals
    • Bulk operations, WHMCS modules, Stripe, and reseller integrations

    Where it doesn't

    • Pricing varies by TLD and reseller tier
    • The platform is oriented toward reseller and platform businesses
    • Advanced capabilities require choosing among multiple pricing tiers

  • Ascio API — where it wins

    • Covers availability, registration, transfers, renewals, and premium domains
    • TLD Kit addresses registry-specific requirements across multiple TLDs
    • Includes DNS, portfolio tools, asynchronous processing, and partner integrations

    Where it doesn't

    • Pricing requires a conversation with sales
    • SOAP-based interfaces may require specialized implementation work
    • Asynchronous orders require message handling and polling workflows
  • OpenSRS8.9/10 · Free plan

    A reseller platform combining domain APIs, white-label sales, and operational automation.

    Visit OpenSRSFull verdict →
  • Ascio API8.6/10 · Pricing on request

    A mature domain automation layer for partners working across multiple TLDs.

    Visit AscioFull verdict →

More comparisons

All domain registration APIs comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update