Postgres 18 Native Passkeys Just Killed Our Auth0 Bill
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Postgres 18 Native Passkeys Just Killed Our Auth0 Bill
For years, our monthly Auth0 bill felt like a necessary evil—a tax on growth. Every new user, every login, added a few more cents to a bill that ballooned from a rounding error into a significant line item. We accepted it as the cost of modern, secure authentication. But that's about to change. The introduction of Postgres 18 native passkeys isn't just an incremental update; it's a seismic shift that empowers developers to reclaim control over their authentication stack and, for many of us, completely eliminate the need for expensive third-party identity providers.
This isn't just a theoretical cost-saving measure. We've run the numbers, and by migrating our user authentication to the database we already rely on, we're projected to save over $20,000 annually. Here’s why this new feature is a game-changer and how it could kill your auth bill, too.
The Tyranny of the Monthly Authentication Bill
Customer Identity and Access Management (CIAM) platforms like Auth0, Okta, and FusionAuth offer a compelling pitch: offload the complexity of user authentication to us. They handle password hashing, social logins, multi-factor authentication (MFA), and now, passkeys. It's a convenient solution, especially for a startup focused on its core product.
However, this convenience comes at a steep, scaling cost. Most CIAM providers charge based on Monthly Active Users (MAUs). At first, the free tier is generous. But as your application succeeds, you quickly cross the threshold into paid tiers.
Our journey is likely a familiar one:
Launch: Free tier, zero auth cost.
10,000 MAUs: Suddenly, we're paying a few hundred dollars a month. Manageable.
50,000 MAUs: The bill creeps toward four figures. We start optimizing login flows not for user experience, but to minimize "active" users.
100,000+ MAUs: The bill is now a major operational expense, a constant reminder of our dependence on a third-party service.
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Beyond the direct cost, there's the issue of data sovereignty. Your user credentials—the keys to your kingdom—are stored on someone else's servers. This introduces vendor lock-in and can create compliance headaches, especially with regulations like GDPR and CCPA.
What Are Passkeys and Why Are They a Big Deal?
Before we dive into the PostgreSQL implementation, it's crucial to understand why passkeys are the future of authentication. A passkey is a digital credential that replaces traditional passwords. Instead of a secret you know (a password), it's based on a cryptographic key pair you have (stored on your phone, laptop, or hardware security key).
Built on the open WebAuthn and FIDO2 standards, passkeys offer three transformative benefits:
Phishing-Resistant: Because the authentication is tied to a specific website origin, it's virtually impossible to trick a user into giving their credential to a phishing site.
Effortless User Experience: Users log in with a simple biometric scan (Face ID, fingerprint) or a device PIN. No more forgotten passwords or complex password requirements.
Superior Security: Passkeys eliminate password reuse, a leading cause of account takeovers. The private key never leaves the user's device.
Until now, implementing WebAuthn required significant application-level logic to handle the cryptographic challenges and verify signatures. This is precisely the complexity that drove many of us to services like Auth0.
Enter PostgreSQL 18: Native Passkey Authentication Explained
The upcoming release of PostgreSQL 18 changes the entire equation by integrating WebAuthn logic directly into the database layer. This is made possible through a new built-in extension, providing functions and data types specifically for handling passkey registration and authentication.
This isn't just syntactic sugar; it's a fundamental shift in where authentication logic lives. Your application no longer needs a complex library or an external API call to verify a user. It simply passes the user's response to a function inside the database it's already connected to.
How It Works Under the Hood
With the new webauthn types, you can store passkey credentials directly alongside your user data. A simplified user table might look something like this:
CREATETABLE users ( id BIGSERIAL PRIMARYKEY, username TEXTNOTNULLUNIQUE, created_at TIMESTAMPTZ NOTNULLDEFAULTNOW());CREATETABLE user_passkeys ( id BIGSERIAL PRIMARYKEY, user_id BIGINTNOTNULLREFERENCES users(id), credential WEBAUTHN_CREDENTIAL NOTNULL,-- New composite type! created_at TIMESTAMPTZ NOTNULLDEFAULTNOW());
The magic happens with the new verification functions. During authentication, your application backend receives a payload from the user's browser and passes it to Postgres.
-- Simplified example of an authentication checkSELECT webauthn_verify_authentication( challenge :='server_generated_random_string', rp_id :='your-app.com', credential_id := client_provided_credential_id, auth_data := client_provided_auth_data, signature := client_provided_signature, public_key :=(SELECT credential.public_key FROM user_passkeys WHERE id =...));
If the signature is valid for the given challenge and public key, the function returns true. The complex cryptographic verification is handled entirely within the trusted, high-performance environment of your database.
The Security Implications
Moving authentication logic into the database drastically simplifies your application's architecture. This reduces the overall attack surface. Instead of securing an application server, a separate auth service, and a database, your primary focus is on securing the database itself—something Postgres is renowned for. PostgreSQL passkey support means your auth logic benefits from the same robust security model, transaction safety, and reliability that your data already enjoys.
The Business Case: Ditching Auth0 for Postgres Passkeys
For a significant number of applications, the combination of Postgres 18 native passkeys and a simple session management strategy (like JWTs or traditional sessions) can completely replace a CIAM provider.
Let's compare the two approaches:
| Feature | Third-Party CIAM (e.g., Auth0) | Postgres 18 Native Passkeys |
| ------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
| Cost | Scales with MAUs, often becoming prohibitively expensive. | Included in your existing database operational costs. |
| Data Sovereignty | User credentials stored on a third-party platform. | Credentials stored in your own database, under your control. |
| Architecture | App -> Auth0 API -> App -> Database. Adds latency and a point of failure. | App -> Database. Simplified, lower latency. |
| Vendor Lock-in | High. Migrating away is a complex and costly project. | Low. Based on open standards (SQL, WebAuthn). |
| Customization | Limited to the provider's configuration options and APIs. | Fully customizable within your application and database schema. |
By making this switch, you're not just saving money. You're gaining control, reducing complexity, and improving performance.
Is This the End for Third-Party Auth Providers?
Not entirely. CIAM platforms still offer value, particularly for large enterprises with complex needs. If your application requires a wide array of social logins (Sign in with Google, Facebook, etc.), enterprise federation (SAML, OpenID Connect), or intricate B2B role-based access control, a dedicated identity provider might still be the right choice.
However, for a vast number of modern applications—startups, SaaS products, internal tools—the core requirement is secure, passwordless login. Postgres 18 native passkeys directly address this core need in the most elegant and cost-effective way possible. It provides the 80% solution that covers 80% of the use cases, without the overhead and expense of a full-blown identity platform.
Conclusion: Reclaim Your Authentication Stack
The arrival of native passkey support in PostgreSQL 18 is a watershed moment. It represents a powerful trend of databases absorbing critical application-level functionality, simplifying the developer experience and reducing costs. For too long, we've outsourced a fundamental part of our application—user identity—and paid a premium for it.
Now, we have a choice. We can build a more secure, faster, and cheaper authentication system using the database we already know and trust.
It's time to re-evaluate your authentication strategy. Take a hard look at your monthly bill from Auth0 or Okta and ask yourself: what am I really paying for? With Postgres 18 native passkeys, the answer may be "not much." Start experimenting with the beta, run your own cost analysis, and get ready to kill your auth bill for good.
