Third-Party Hosting: Making KeyPears as Easy as Hosted Email

Imagine you own example.com. You run your own website there, but you don't run your own email server—Gmail or Fastmail handles that for you. Your email address is still you@example.com, but Google or Fastmail does the heavy lifting of running the mail servers, managing spam, and keeping everything online.

What if password management worked the same way?

Today we shipped the foundation for exactly that: the ability to point your domain's KeyPears protocol at any third-party hosting provider. It's a proof-of-concept, but it works—and it brings us one step closer to making decentralized password management as easy as hosted email.

Why Decentralization Matters

Email is one of the internet's great success stories in federated architecture. Anyone can run an email server. Gmail users can email ProtonMail users who can email self-hosted server users. There's no central authority deciding who gets to participate. The protocol is open, the address format is universal, and interoperability is the default.

KeyPears borrows this architecture, but improves on it in a critical way: end-to-end encryption by default. When alice@keypears.com shares a secret with bob@company.com, the servers never see the plaintext. They're just coordinators—dumb pipes that route encrypted blobs between clients that hold the real keys.

The address format mirrors email intentionally. Your vault is yourname@yourdomain.com. You can use our hosted service at keypears.com, run your own server, or—with what we built today—point your domain at any KeyPears hosting provider you trust.

This means companies with different domains and different service providers can still share secrets securely. Marketing at acme.com (hosted by Provider A) can share API keys with engineering at partner.io (self-hosted) using the same Diffie-Hellman key exchange that makes the whole system work.

The .well-known/keypears.json Protocol

The implementation is simple. Domain owners create a file at /.well-known/keypears.json that tells clients where to find the API:

{
  "version": 1,
  "apiUrl": "https://keypears.com/api"
}

That's it. When a KeyPears client needs to interact with vaults at example.com, it fetches https://example.com/.well-known/keypears.json, reads the apiUrl, and directs all API calls there.

If you're running your own server, the apiUrl points to yourself:

{
  "version": 1,
  "apiUrl": "https://example.com/api"
}

If you're using a third-party host like keypears.com:

{
  "version": 1,
  "apiUrl": "https://keypears.com/api"
}

The pattern follows the established convention of .well-known files that power everything from SSL certificate validation (.well-known/acme-challenge) to security contact information (.well-known/security.txt). It's a proven approach for domain-level configuration.

What We Built Today

This week we implemented the complete infrastructure for this feature:

In the library (@keypears/lib):

• A Zod schema (KeypearsJsonSchema) that validates the keypears.json format
• A buildBaseUrl() helper for constructing domain URLs

In the API server (@keypears/api-server):

• Updated validateKeypearsServer() to parse and return the apiUrl

In the webapp (@keypears/webapp):

• A dynamic React Router resource route that serves keypears.json
• Environment-aware configuration (production vs development URLs)

In the Tauri app (@keypears/tauri-ts):

• fetchApiUrl() function that retrieves and caches API URLs from keypears.json
• Updated all API client calls to use the discovered URL instead of constructing it

The key insight is that clients no longer assume the API lives at https://domain.com/api. They discover it dynamically. This single change enables the entire third-party hosting model.

What's Still Needed

We want to be transparent: this is a proof-of-concept, not a production-ready feature. There's a critical missing piece.

The problem: Right now, anyone could create a keypears.json file claiming that keypears.com/api hosts vaults for example.com. There's no verification that the owner of example.com actually authorized this.

The solution: Before launch, we'll add a public key (or public key hash) to the keypears.json file. The domain owner will need to prove they control this key, likely through a challenge-response protocol or by publishing the key in DNS. This cryptographic proof ensures that only the legitimate domain owner can authorize a hosting provider.

The future format might look like:

{
  "version": 2,
  "apiUrl": "https://keypears.com/api",
  "domainPubKeyHash": "a1b2c3d4..."
}

We haven't implemented this yet because the current proof-of-concept is sufficient for development and testing. The infrastructure is in place; the authentication layer comes next.

The Bigger Picture

KeyPears is building toward a world where password management works like email should have worked from the start: decentralized, interoperable, and encrypted by default.

• Decentralized: No single company controls the network. Run your own server or choose a provider you trust.
• Interoperable: alice@keypears.com can share secrets with bob@selfhosted.org seamlessly.
• End-to-end encrypted: Servers are dumb coordinators. They never see your passwords, your keys, or your plaintext secrets.
• Self-custody with convenience: You control your keys, but you get the sync and sharing features of cloud-based managers.

The third-party hosting feature is a key piece of this puzzle. It means you don't have to choose between running your own infrastructure and using someone else's domain. You can have your cake and eat it too: your domain, your identity, someone else's servers.

What's Next

With third-party hosting infrastructure in place, our next priority is the Diffie-Hellman key exchange protocol for secure secret sharing between users. This is the feature that makes KeyPears more than just a password manager—it's what enables alice@company.com to securely share credentials with bob@partner.io without either server ever seeing the plaintext.

After DH key exchange, we'll focus on:

• Multi-domain support (official KeyPears domains beyond keypears.com)
• Domain ownership verification (the public key piece mentioned above)
• Payment and business model (freemium with premium custom domain hosting)

The architecture is coming together. Each piece we build makes the next piece possible. Today's proof-of-concept becomes tomorrow's production feature.

If you're interested in following our progress, the code is open source and available on GitHub. We're building in public because we believe the best security software is software you can verify.

Next up: Diffie-Hellman key exchange for cross-user secret sharing. Stay tuned!