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Every request to the Clay Public API must include a Clay API key in the clay-api-key header. 
curl https://api.clay.com/public/v0/me \
  -H "clay-api-key: $CLAY_API_KEY"
API keys are tied to a Clay user and workspace access. Create one in Account settings. Keep keys server-side and do not expose them in browser code, mobile apps, public repositories, logs, or analytics tools.
HeaderRequiredDescription
clay-api-keyYesPersonal API key for the Clay Public API.

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Failed authentication

Requests without a valid API key return a non-2xx response with the standard error shape: 
{
  "message": "Authentication failed"
}