# Indexer Indexers are used to subscribe to updates from [Sources](https://docs.simulacrum.network/synthetic-blockchain/organization/indexer/sources), and use that information to publish the information onchain. Indexers are rewarded for providing valid Commands in the form of points. An indexer is not able to publish a transaction directly, as they must first get [Existential Attestation](https://docs.simulacrum.network/existential-attestation) from an Oracle. --- # 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.simulacrum.network/synthetic-blockchain/organization/indexer.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.