The modern email API for product teams.

One typed API for transactional, marketing, and product email, with versioned templates, signed webhooks, and replies that thread back to your app.

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Subj

Inbox

Your message lands here in real time.

Simulated demo · real sends require an account

01Send

Your first email in five minutes.

Install samva, drop in your key, and the first email goes out. The same typed call carries transactional, marketing, and product email. Template helpers, the webhook verifier, and idempotency ship in the same package.

// one call for every kind of email
await samva.messages.send({
  channel: "email",
  to: "maya@acme.com",
  email: {
    templateId: "order-update",
    templateData: { orderId: "A-1042" },
  },
});

02Templates

Pin a version. Pass data by name. The right message goes out.

Versioned, server-side templates handle everything from order receipts to product launches. The version you pinned is the version that sends, so a template change doesn't ship the wrong email to half a million customers overnight.

templates4 versions

order-updatev4 · 1,204 sends today

password-resetv2 · 612 sends today

welcomev7 · 188 sends today

03Receive

Replies thread back into your app. Not into a side mailbox.

Samva treats threading as a first-class data model. A single conversation per customer holds every outbound send, reply, forward, and bounce. Inbound email lands parsed and threaded as an event in your code, not as something a human has to forward.

inbound · thread #8842parsed

maya@acme.com2m ago

Thanks, got the shipping update. One question…

routed to support · attachments stripped & scanned

04Events

Every send comes back as a signed event you can verify.

Delivery, open, bounce, complaint. Each arrives as an HMAC-signed webhook with a typed verifier shipped in the SDK. Retried with backoff until your endpoint acknowledges, so you never miss the event that explains the outcome.

events · signed200 OK

POSTemail.deliveredmsg_a1c

POSTemail.bouncedmsg_9f2

POSTemail.complainedmsg_4d8

HMAC-signed, idempotent, retried with backoff until your endpoint acknowledges.

05What you stop running

One platform replaces five.

Most product teams ship email through a stack of five things nobody owns end to end. Samva is one platform that owns all five, with deliverability you can verify and per-email pricing that doesn't surprise you at scale.

Stop running

Domain authentication and warm-up
A separate template engine
A thread_id convention you invented
A deliverability dashboard
A suppression-list cron

Ship

First send in five minutes
Inbound parsed and threaded
Signed events, verified in code
Per-email pricing, in your currency
EU GDPR consent handled

Built for developers

Typed end to end. From request payload to webhook verifier.

Every endpoint is described in OpenAPI 3 and generated into typed SDKs for TypeScript, Python, Go, and Ruby. The TypeScript SDK ships in two flavors: a conventional async/await client, and an Effect-native client with typed errors and Layer-based services.

OpenAPI 3 spec, so you can generate a client in any language
Typed webhook verifier in every SDK, no shared-secret guesswork
Idempotency keys, so a retry returns the original message id, never a duplicate
An Effect-native SDK that exposes services as Layers, not a wrapper

// one call for every kind of email
await samva.messages.send({
  channel: "email",
  to: "maya@acme.com",
  email: {
    templateId: "order-update",
    templateData: { orderId: "A-1042" },
  },
});

Pricing

Per-email pricing on the volume you send.

Every plan includes a monthly email volume, then you pay per email beyond it. Starter is $5 for 15,000 emails; Enterprise is custom. Billed in 135+ currencies via Stripe.

Starter

$5/month

Email infrastructure at starter volume

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