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An API key (sk_ntl_*) is your Party’s server-side credential. A request made with it acts as your party, limited to the scopes the key was created with. Keep it on servers you control, never in a browser or client app.

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Scopes

Every key carries an explicit scope list, so you can create narrow keys for narrow jobs. A call outside the key’s scopes is rejected.

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Keys and agents

An API key moves money as a party action and cannot act as an agent. A credential that is an agent is an Agent key. See Authentication for the full credential model.

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Secrets

The secret is returned once, on creation, and can never be read again. Revoking a key invalidates it immediately.