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Architecture
Stop Gluing Auth0 to SendGrid
March 1, 2026
4 min read
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Bi-weekly engineering deep dives on auth, notifications, and developer infrastructure. No spam.
Sign Up for UpdatesPublished by Zyphr
March 1, 2026
4 min read
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Bi-weekly engineering deep dives on auth, notifications, and developer infrastructure. No spam.
Sign Up for UpdatesPublished by Zyphr
If you're running a SaaS product, there's a good chance your stack looks something like this:
That custom code — the Auth0 Actions, the webhook handlers, the queue consumers — is what we call "glue code." And it's a maintenance burden that compounds over time.
Every auth event that needs an email requires integration code:
For each of these, you need:
That's 200-500 lines of integration code, spread across Auth0 Actions, your backend, and possibly a message queue. And every time you add a new auth flow, you add more glue.
Glue code isn't just annoying — it's expensive:
With Zyphr, auth and email are the same platform:
// User signs up
const { user } = await zyphr.auth.register({
email: 'jane@example.com',
password: 's3cur3P@ss',
});
// Done. Zyphr automatically sends the verification email.
// No glue code. No webhook handler. No queue consumer.
When auth events happen, the corresponding emails go out automatically:
| Auth Event | Glue Code Required | |
|---|---|---|
| Registration | Welcome + verification | None |
| Password reset request | Reset link | None |
| MFA enrollment | Setup instructions | None |
| Suspicious login | Security alert | None |
| Email change | Confirmation link | None |
Let's compare costs for a typical SaaS with 25,000 monthly active users and 100,000 transactional emails:
| Auth0 + SendGrid | Zyphr | |
|---|---|---|
| Auth | ~$240/mo | Included |
| ~$90/mo | Included | |
| Glue code maintenance | ~$500/mo (engineer time) | $0 |
| Total | ~$830/mo | $79/mo |
The direct vendor savings are significant, but the real win is eliminating the engineering time spent maintaining integration code.
Be honest about your needs:
Migration is straightforward:
Most teams complete the migration in under a day.