# BIP19 and Yield Bearing Tokens The[ BIP19 -"Incentivize Core Pools and L2 Usage"](https://forum.balancer.fi/t/bip-19-incentivize-core-pools-l2-usage/3329) introduced a new fee distribution on interest-bearing Core Pools. The proposal [passed on 3rd July 2022.](https://snapshot.org/#/balancer.eth/proposal/0x28bd2c5580f5a8effacdceb0aec52e9bc63987fa4f4a39f8b8223257ca4376cc) A Core Pool is **a Pool that contains at least 50% yield-bearing tokens that Balancer earns a fee on.** \ On Ethereum Mainnet, Core Pools get fees they generate used as bribes for them in the next cycle after the DAO takes 25%. On L2s such as [Polygon](https://polygon.balancer.fi/?utm_campaign=vebal\&utm_source=twitter\&utm_medium=blogpost#/) and [Arbitrum](https://usefathom.com/utm-builder?utm_campaign=vebal\&utm_source=twitter\&utm_medium=blogpost), all fees earned are bribes for the Core Pools on each network. Instead of going to Balancer, this revenue goes towards incentives (bribes). The goal is to incentivize the liquidity of yield-bearing tokens (eg: wstETH, stMATIC, etc.). The 50% protocol fee for the yield on these tokens also increases the protocol’s revenue. --- # 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://balancer.gitbook.io/balancer-v2/ecosystem/vebal-and-gauges/vebal/bip19-and-yield-bearing-tokens.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.