# Discovery API interfaces SoundProtocol will produce a first-party discovery API interface, but other community members are encouraged to author their own interfaces that extend or modify the core API. The protocol allows fans to select any discovery API interface registered in the SoundProtocol content ledger. An API interface must index new blocks from the SoundProtocol ledger atomically (i.e. all-or-nothing), and all API methods must be deterministic. Because of these requirements, for a given block hash, all discovery nodes running a given API interface will produce identical results for the same query. --- # 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://soundprotocol.gitbook.io/soundprotocol/discovery-node/discovery-api-interfaces.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.