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

# Jug

### **Purpose**

Calculates and accrues stability fees on minted USDD. These fees ensure protocol sustainability and discourage excessive borrowing.

### Key Responsibilities

* Accumulate stability fees for particular collateral types .
* Adjusts debt levels to reflect accrued interest.

### Key Methods

* d`rip(ilk)`\
  Performs stability fee collection for a specific collateral type when it is called. Calls `Vat.fold` to update the collateral's rate, total tracked debt, and Vow surplus;

  duty: Annualized stability fee rate.
* `file(what, data) / file(what, ilk, data)`\
  Configures global and per-collateral stability fee rates.
  * Example Parameters:
    * `duty`: Annualized stability fee rate.


---

# 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:

```
GET https://docs.usdd.io/developers/core-contracts/jug.md?ask=<question>
```

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.