Email API for your software, on your own domain
Send receipts, alerts and notifications from your own domain with one HTTP request. No mailboxes, no webmail, a flat monthly price and a person to talk to.
Request accessAPI Start
A website, a small app or a side project.
- 25,000 emails / month
- Up to 1,250 / day
- 2 sending domains, 3 senders
- 3 API keys
- Delivery and failed-send log
- Email support
API Growth
A product that sends receipts, alerts and notifications.
- 100,000 emails / month
- Up to 5,000 / day
- 5 sending domains, 5 senders
- 5 API keys
- Delivery and failed-send log
- Priority support
API Only
High volume or special needs.
- Limits agreed with you
- 10 API keys
- Dedicated IP available ($39 / month)
- Domains and senders by agreement
- Priority support
How it works
1. Apply
Tell us who you are, what you will send and from which domain. It takes about two minutes.
2. We review
A person checks every application, usually within one business day, so shared sending reputation stays clean for everyone.
3. Activate
Approved? You get a sign-in link to the Cyphex Portal, set up two-step verification, and activate your plan.
4. Send
Add your domain, publish the DNS records, create a sender and an API key. Then send with one HTTP request.
How we compare
Indicative ranges from public pricing pages in 2026. Check each vendor for current prices.
| Cyphex API | Typical established vendors | |
|---|---|---|
| Entry price per 1,000 emails | $0.48 (Start), $0.35 (Growth) | about $0.40 to $1.50 at established vendors |
| Extra volume | Upgrade, or a custom rate: $0.45 to $0.60 per 1,000 | about $0.90 to $1.80 per 1,000 |
| Your own domain with DKIM, SPF, DMARC | Included, guided setup | Included |
| Per-key rate limits and a failed-send log | Included | Often a higher tier |
| Human support in your time zone | Included (email / priority) | Usually higher tiers only |
| Pricing currency and billing | Flat monthly price in USD, no surprise bills | Metered, grows with volume |
| Uptime commitment | 99.5% target (SLA page) | 99.9% typical |
Not available yet (we would rather say so):
- Delivery and bounce webhooks
- Inbound email parsing through the API
- Idempotency keys
- Dedicated IP on the Start plan
Request API access
No payment is taken now. We review every application by hand and email you the result.