Documentation
Transactional email infrastructure for developers — start here.
Zerokit is a transactional email API for product builders. Send mail that lands in the inbox, with deliverability primitives — DKIM, SPF, DMARC, MAIL FROM, tracking domains — handled for you.
This is the developer documentation. If you are looking for billing or account management, head to your dashboard.
What's inside
- Quickstart — sign up, verify a domain, issue an API key, send your first email in under five minutes.
- Authentication — API key format, scopes, rotation.
- Webhooks — subscribe to delivery events (delivered, bounced, complained, opened, clicked) and verify signatures.
- SDKs — language-level clients (REST is the source of truth; first-party SDKs are on the roadmap).
Looking for endpoint-by-endpoint spec? Switch to the API Reference tab in the top nav.
Why Zerokit
- No vendor lock-in. Open-source. Self-hostable on Cloudflare Workers + Turso. Bring your own AWS SES identity.
- Production deliverability. RSA-2048 BYODKIM, Custom MAIL FROM, branded tracking subdomains, DMARC reporting — all wired up.
- Webhooks signed with HMAC-SHA256. Stripe-style
X-Zerokit-Signatureheader, timestamped to prevent replay.
Ready?
Go to the Quickstart — by the end you'll have sent a real email through the API.