Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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I am selfhosting (using quickstart docker images at the moment) - does this mean I can use the admin port (4434) without generating an API key, to put it another way are admin apiKeys only relevant to OryNetwork?

The kratos docker image does not authenticate API requests by default, so you can use it without an API key.