# Teller

The Teller contract handles all interactions with end users and manages tokens issued to represent bond positions. 

Users purchase bonds by depositing Quote Tokens and receive a Bond Token (token type is implementation-specific) that represents their payout and the designated maturity. 

Once a bond vests, users can redeem their Bond Tokens for the underlying Payout Token. 

A Teller requires one or more Auctioneer contracts to be deployed to provide markets for users to purchase bonds from. 

A Teller depends on an Aggregator contract to get market information to complete purchases.

<figure><img src="/files/jqhUYr7BtbHghDiV8vf5" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: 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://dev.bondprotocol.finance/smart-contracts/bond-system/teller.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.