# Chain Abstraction City Protocol's swap client implements native chain abstraction across both EVM and Solana ecosystems. The SDK resolves common token symbols into chain-specific addresses, validates address formats per chain type, and handles the protocol-specific nuances of each environment. EVM approval orchestration is built into `executeSwap` with automatic revoke-then-approve for tokens that require it. Solana swap execution passes through `unsignedTx` and optional `jitoUnsignedTx` for MEV-protected bundled execution, providing a unified developer experience without fragmenting liquidity or forcing chain-specific integration code. --- # 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://city-protocol.gitbook.io/docs/neofinance-as-a-service/swap-module/chain-abstraction.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.