> For the complete documentation index, see [llms.txt](https://docs.h4.world/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.h4.world/overview.md). # Overview
H4 is a non-custodial iOS trading app for [perpetual futures](/getting-started/perpetual-futures.md) on Hyperliquid. It gives users access to more than 300 markets across stocks, indices, crypto, commodities, FX, predictions, spot and pre-markets. [H4IP-1](/improvement-proposals/h4ip-1.md) (Community Revenue Unit) is the economic foundation of the app, built around one simple idea: own the platform.\ By using the app, you become part of the community and gain a stake in the platform you help grow. H4 supports innovative features like blazing fast chart-trading, Prediction markets, advanced market views, and more... All metrics in the interface are standardized around U.S. dollars so that account value, volume, open interest, order value, position value, and PnL can be read consistently across markets. Orders are submitted using builder codes with a 0.055% fee on notional. ## Non-custodial H4 is an interface layer that connects users to Hyperliquid markets, including **Core** and other **HIP-3 DEX** markets. It does not custody user funds, pool balances, or take control of user accounts. The app has no ability to reverse transfers, recover lost access, or undo actions once they are confirmed. * Your funds stay under your control at all times. * Your account is tied to your wallet, so you are responsible for access, security, and key management. * H4 does not hold your funds for you. Deposits, withdrawals, swaps, and trades happen through your own account on supported rails and markets. * If you lose access to your wallet or private key, H4 cannot recover your funds for you. * You can export your private key from the **Export** page. ### Try it out! Download the Testflight beta at: --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.h4.world/overview.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.