# Credit Accounts Credit Accounts (CAs) are the bread and butter of Phase. To interact with almost anything in the protocol, a user must create or own a CA. They are based on the ERC721 standard and are non-fungible, meaning every CA is different from each other. There can be only one owner of a CA, though it can be given to any contract or EOA, allowing for multisigs to own and mint CAs.\ \ Creating one is totally free and only requires gas once, creating happens whenever you interact with the protocol and don't have an account yet. A user can only own one CA, though this might change in the future with improvements to UX. Currently, no vault or user data is stored on the CAs; they are only used as proof of ownership, though this might change in the future. Minting a new account doesn't affect any other positions, as all of them are isolated. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.phase.cash/vaults/credit-accounts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.