# On-chain events #### Event parsing Brist parses each new block for transactions in which at least one of the following occurs: * A transfer of ETH * A transfer of an ERC-20 token * A transfer of an ERC-721 token (NFT) Brist then enriches these transactions and passes them forward through each filter, before dispatching the filtered messages to the output channels. --- # 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.usebrist.com/fundamentals/on-chain-events.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.