The playground

Try any of 817 endpoints — live.

Pick an endpoint, load a working example, tweak the params, and send — no signup to try. Results render the way the data deserves; raw JSON, headers & code are one tab away.

Playground demo key · api.reefapi.com
post/email-health/v1/dkim1 credit

DKIM selector lookup (<selector>._domainkey.<domain>): key type, public-key presence, RSA key-bit estimate, revocation. Autoscans ~30 common selectors if none given.

Working example
Parameters

The domain to inspect (a bare host like github.com; a full URL, a leading www., or a full email address are accepted and normalized to the registrable domain).

DKIM selector (the label before ._domainkey, e.g. 'google', 'selector1', 'k1'). Omit to autoscan ~30 common ESP selectors. DKIM selectors are provider-specific — pass the exact one if you know it.

Optional comma-separated list (or array) of DKIM selectors to test instead of the common-selector autoscan.

request preview
curl -X POST https://api.reefapi.com/email-health/v1/dkim \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"domain":"paypal.com","selector":"pp2"}'

Hit Send to run this endpoint live.