Write and send
Transactional API
Send receipts and other one-off emails from your own app.
What it is
Receipts, password resets, download links. If you've built an app or a shop, you need to send these, and you probably don't want a second email provider just for them.
Kōlea sends them from your own domain with one API call, from a template you write in Markdown. No marketing footer, no tracking unless you ask for it.
01 Transactional API
A template and one call
Write the template once with variables like {{order}} and {{download_url}}. The template screen shows you a curl request ready to paste, slug and variables filled in.
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An idempotency key on every send, so if your app retries a request, the email still only goes out once, even when two requests race each other.
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A send-only key, that can send transactional mail and can't read or change your list. Give it to your shop and sleep better.
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New addresses are added quietly, and never marketed to, so a receipt doesn't sign anyone up for your newsletter.
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Clear errors, a 422 that names the field, a 404 for a missing template, a 429 with Retry-After. Your logs will thank you.
The short version
- One API call sends a message from a template to one person.
- If your app retries a request, the email still only goes out once.
- Use a key that can send email but can't read or change your list.
Try it on your own list
Free for your first 500 subscribers, no credit card needed. We'll help you move your list over.