> For the complete documentation index, see [llms.txt](https://walking-blocks.gitbook.io/unda-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://walking-blocks.gitbook.io/unda-documentation/readme.md).

# Official Unda Documentation

Unda is a decentralized borrowing protocol that allows you to create interest-free loans, paid out in KUSD, using KOIN tokens as collateral. You can freely mint KUSD and repay your loan as you see fit, as long as you keep a minimum collateral ratio of 150%.

Unlike other platforms Unda does not charge interest rates, transaction fees or gas fees. The only fee you pay is a one-time deposit fee of 0.5%. This makes KUSD frictionless, cheap and accessible to everyone.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>General</strong></td><td>Learn about the basics of Unda</td><td></td><td></td><td><a href="/pages/4C6YxWKK9ta0yG5pS790">/pages/4C6YxWKK9ta0yG5pS790</a></td></tr><tr><td><strong>KUSD</strong></td><td>The stablecoin at the heart of Unda</td><td></td><td></td><td><a href="/pages/Fa5GYYJp6iWJ1p1HmE4s">/pages/Fa5GYYJp6iWJ1p1HmE4s</a></td></tr><tr><td><strong>Smart Contract</strong></td><td>Learn more about the KUSD smart contract</td><td></td><td></td><td><a href="/pages/jZ7iZduTwjkmGdJt9Ga2">/pages/jZ7iZduTwjkmGdJt9Ga2</a></td></tr></tbody></table>