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Resend

Resend is used for sending email alerts, primarily for health check failures (services going down or degraded). It also supports custom alert emails.

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What it powers

  • Alert system — Sends formatted HTML emails when BetterStack reports services as DOWN or DEGRADED
  • Custom alerts — Send arbitrary alert emails via the /api/alerts/send endpoint

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Getting your API key

1

Sign in to Resend

Go to resend.com and sign in.
2

Create an API key

Go to API Keys in the sidebar (or visit resend.com/api-keys).Click Create API Key. Give it a name and select appropriate permissions.
3

Verify a domain or use the test address

Go to Domains and add/verify a sending domain.Alternatively, for testing, you can use the onboarding@resend.dev sender address.

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Environment variables

.env.local
RESEND_API_KEY=re_xxxxxxxxxxxxxxxxxxxxxxxxxxxx
RESEND_FROM_EMAIL=alerts@yourdomain.com
RESEND_TO_EMAIL=you@example.com

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API details

PropertyValue
API base URLhttps://api.resend.com
Rate limit2 req/s (free tier), 100/s (pro)
Cache TTLN/A (send-only)
AuthenticationBearer token (Authorization: Bearer re_...)
Resend is the only service that sends data out rather than fetching it in. If not configured, alerts simply won’t be sent — the dashboard still works normally.