# Foundational Stores Foundational stores are available for various blockchain ecosystems, each optimized for specific data patterns and use cases: ### Ethereum * [ERC20 Token Metadata](/how-to-guides/composing-substreams/foundational-stores/erc20-token-metadata.md) - Store and serve ERC20 token metadata and balances ### Solana * [SPL Initialized Account](/how-to-guides/composing-substreams/foundational-stores/spl-initialized-account.md) - Track SPL token account initialization and ownership ## Additional Resources * [Foundational Stores Reference](/reference-material/core-concepts/foundational-store-reference.md) - Detailed architecture and technical specifications --- # 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.substreams.dev/how-to-guides/composing-substreams/foundational-stores.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.