> For the complete documentation index, see [llms.txt](https://docs.notional.finance/traders/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.notional.finance/traders/chinese/using-notional/fcash.md).

# fCash

fCash tokens are the basic building block of the Notional system. fCash are transferable tokens that represent a claim on a positive or negative cash flow at a specific points in the future. 

![](/files/-MIVcutl5jmKoDsqFnwL)

fCash tokens are always generated in pairs - assets and liabilities always net to zero across the Notional system.

![](/files/-MIVd7RweQgMGSsf80xl)


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