# Vault Assets Aera Vaults are developed to hold and rebalance two or more ERC20/ERC4626 assets. ### ERC20 Assets One of the ERC20 assets is designated as the numeraire asset. One of the ERC20 assets is designated as the fee token (this could overlap with the numeraire asset) Each ERC20 asset has to specify a Chainlink-compatible oracle contract for pricing purposes against the numeraire asset. ### ERC4626 Assets ERC4626 assets are supported to incorporate yield strategies in Aera. The built-in oracle is used to price these assets. The underlying asset of an ERC4626 has to be a supported ERC20 asset in the vault. --- # 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.aera.finance/v2-archive/concepts/vault-assets.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.