Transactional Email API Built for EU Infrastructure

Send your first email in under 5 minutes

Sign up, copy your sandbox key and make your first API call. The sandbox environment mirrors production — when you go live, only the key changes.

• ✓Sandbox key available immediately on signup
• ✓No DNS setup required for initial testing
• ✓Production key activates after domain verification
• ✓Same endpoints for sandbox and production

const res = await fetch(
  'https://app.nexuspromail.com/api/v1/api/send',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_API_KEY',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      to: 'user@example.com',
      from: 'hello@yourdomain.com',
      subject: 'Your password reset link',
      html: '<p>Click here to reset...</p>',
    }),
  }
)
const data = await res.json()
// { success: true, messageId: 'msg_...' }

Sandbox key on signup

Test in a fully isolated sandbox environment. No DNS changes needed. Switch to production with one key rotation.

Webhooks for every event

Receive signed webhook calls for sent, delivered, opened, clicked, bounced and complained. Register up to 10 endpoints per account.

Suppression enforcement

The API checks your suppression list before every send. Unsubscribed and hard-bounced addresses are rejected at the API level, not just filtered.

Per-send analytics

Query open rates, click rates and bounce rates per message ID via the analytics API. No dashboard login required.

GDPR-compliant by default

GDPR-focused infrastructure operated under EU law. Suppression enforced. DSAR (erasure) endpoint included. DPA available on request.

Rate limiting by plan

API calls are rate-limited to match your plan's send quota. The usage endpoint lets you check remaining sends programmatically.