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All data endpoints require an API key.

Send Your API Key

Recommended:
X-API-Key: sk_...
Also supported:
Authorization: Bearer sk_...

Validate Your Key

Use GET /v1/ads/me to validate and introspect your key:
curl -s \
  -H "X-API-Key: sk_..." \
  "https://api.mosaic.dev/v1/ads/me" | jq
The response includes a minimal key fingerprint (key_last4) plus plan/usage metadata (when available).