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Resend alternative for transactional email
Keep a simple API key + POST /emails developer experience. Run production on owned transactional mail infrastructure with a clear path to Dedicated servers and IPs.
- POST /emails
- stx_ API keys
- Owned Pool · Dedicated
At a glance
Same developer habits. Different infrastructure.
You still send with an HTTP API and an npm package. The difference is whose network carries the mail — and what “Dedicated” actually means.
| Attribute | Resend | SuperSend TX |
|---|---|---|
| Send API | POST /emails | POST /emails |
| API keys | re_… | stx_… |
| npm | resend | supersendtx |
| Infrastructure | Cloud email (SES-class) | Owned transactional network |
| Free tier | Generous free sending | Sandbox for integration tests |
| Production | Paid plans | Pro from $20/mo · Dedicated from $299 |
Who this is for
Owned pipe for mail that has to arrive
Teams that like a modern send API but want infrastructure they can explain to compliance, finance, and deliverability.
Owned infrastructure
Transactional mail on a network we operate — not just an API in front of someone else’s cloud pipe.
Paid Pool, declining overage
Pro and Scale include volume with overage that declines as you grow — not a free-tier mix on the same reputation.
Real Dedicated tier
Managed servers and IPs for your workspace when you outgrow shared Pool — same API either way.
Familiar send shape
Bearer stx_… keys, flat from / to / subject / html, and an npm SDK your team can swap in quickly.
Migration
Cut over in minutes
Keep your templates and product logic. Change the client, key, and base URL.
- 1
Create an API key
Issue a stx_ key in the dashboard and keep it scoped to the right environment.
- 2
Verify your domain
Add SPF, DKIM, and return-path — including one-click apply for Cloudflare and GoDaddy.
- 3
Point the client
Use supersendtx (or raw HTTP) against api.supersendtx.com with Bearer stx_…
- 4
Map the fields
Follow the Resend migration guide for field-for-field mapping.
- Sandbox for safe integration tests before DNS is live
- Webhooks, templates, inbound, SMTP, SDK, CLI, and MCP on every plan
- Same send API whether you stay on Pool or move to Dedicated
Try SuperSend TX on Sandbox
Integrate once. Send on Pool for production. Book Dedicated when you need your own servers and IPs.