# Contract Types YFX V4 supports linear and inverse contracts. ## Linear contract Also known as "USD-based contract." When trading linear contracts, traders can use stable coins (USDC or USDT) as margins to go long or short BTC, ETH, and other coins. ## Inverse contract Also known as "Coin-based contract" When trading inverse contracts, traders can use ETH as a margin to trade ETH/USD contracts. --- # 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.yfx.com/yfx-v4/trading/contract-types.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.