Integrations

Koltrix plays well with any system that speaks HTTP, SMTP, or webhooks.

Built-in

Service	What we use it for
Clerk	Auth, organisations, multi-org switcher
Stripe	Billing — checkout, customer portal, webhooks
OpenRouter (or any OpenAI-compatible)	AI classify, summarise, auto-reply
Cloudflare	DNS-01 ACME challenges, edge proxying
MinIO (or any S3-compatible)	Email body + attachment storage
Meilisearch	Full-text search across your inbox

SDK-style

Language	Best path
Node	`fetch` for REST + `nodemailer` for SMTP (samples in Sending email)
Python	`requests` for REST + `smtplib` for SMTP
Go	`net/http` for REST + `net/smtp` for SMTP
PHP	`PHPMailer` over SMTP
Ruby	`Net::SMTP` or `Net::HTTP`

Zapier / Make / n8n

Use Koltrix's REST API as a generic webhook target on the producer side, and configure outbound webhooks to send your events to Zapier/Make hook URLs.

Forms

Embed a form on your site that posts to your own backend, which then calls POST /api/v2/lists/{list_id}/subscribers. Don't put the API key in the browser — keep it server-side.

<!-- minimal hand-off -->
<form action="/api/subscribe" method="post">
  <input name="email" placeholder="[email protected]" />
  <button>Subscribe</button>
</form>

// /api/subscribe handler
await fetch(`https://api.koltrix.com/api/v2/lists/${LIST_ID}/subscribers`, {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.KOLTRIX_KEY}` },
  body: JSON.stringify({ email: req.body.email }),
});

Inbound email parsing

Receive emails to addresses on your verified domain at Settings → Domains, and they'll appear in the dashboard inbox. If you need to programmatically handle them, hit POST /api/webhooks/inbound with the route you configured.