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

# Core Financial Infrastructure

- [Permanent Index (PI)](https://docs.autonomous.finance/core-financial-infrastructure/permanent-index-pi.md): The Permanent Index (PI) represents the foundational economic core of the AO Ecosystem, serving as an on-chain, permissionless, autonomous index.