# Listen to Changes WebSockets provide the ability to receive a stream of all changes on VeChain, reducing the number of network requests that are normally associated with polling data at regular intervals. The available streams for changes are: 1. Events that are emitted from contracts 2. Blocks appended to the Blockchain 3. VET Transfers occurring between addresses 4. Transactions added to the transaction pools 5. Beats of new blocks which can be used to check if the block contains a specific account --- # 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.vechain.org/developer-resources/how-to-build-on-vechain/listen-to-changes.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.