One API for Custom Domains Across Five Hosting Platforms

Every SaaS team that ships custom domains for customers rewrites the same glue code five different ways, once per hosting platform.

Five different APIs for one feature is a tax on every SaaS team

Adding a customer domain on Vercel requires different calls, different error shapes, and different status checks than doing the same thing on Render or Railway. Teams either maintain brittle per-provider wrappers or lock into one platform to avoid the sprawl.

One import replaces the entire provider-specific surface

OpenCoreDev Releases Domain SDK 0.2.0 exposes a single createDomainClient() factory that returns seven methods: add, get, refresh, list, verify, remove, and waitUntilActive. Each hosting provider ships as its own entry point, so switching from Vercel to Netlify means changing the import path, not the workflow. The SDK returns typed DNS records, surfaces granular status across eight states, and flags each issue as retryable or not.

Platform engineers are the first to feel this

  • Backend engineers building multi-tenant SaaS who need typed, idempotent domain operations without writing per-provider retry logic.
  • DevOps engineers managing deployments across Railway or Render who want a single observable status model instead of polling raw provider APIs.
  • Founding engineers at early-stage SaaS products who cannot afford to maintain five separate domain integration wrappers as they test platforms.

The SDK is server-side only, which matters. Credentials stay off the client, and the package ships with a single runtime dependency, keeping the supply chain small.

Custom domains went from a nice-to-have to a table-stakes SaaS requirement

Vercel alone processed millions of custom domain verifications in 2024, and every major SaaS competitor now treats white-label domains as a default feature, not a premium add-on. Teams that cannot ship this cleanly are already losing deals to those that can.

What you can build with it today

  • Add and verify a customer domain with a single typed method call.
  • Show users the exact DNS records they need to configure, with zero guesswork.
  • Poll domain readiness with waitUntilActive and an AbortSignal for timeout control.
  • Swap hosting providers by changing one import, leaving all application logic intact.

Pricing not listed — check our directory.

A TypeScript SDK that does less is exactly why it works

Domain SDK does not register domains, host DNS, deploy apps, or store tenant data, so if you need any of those capabilities, you are combining tools, not replacing them.

Teams that want a fully managed white-label domain product can look at Entri or SaaS providers with built-in domain management. Neither gives you the same low-level, provider-agnostic TypeScript control that Domain SDK does.

TypeScript infrastructure tooling is quietly eating the glue-code layer

Typed, single-purpose SDKs that replace hand-rolled integrations are becoming the default starting point for serious backend work. We cover tools like this every Friday — subscribe here and we’ll send the best ones straight to you.