# Intro

This section will cover how to interact with Notional V3 contracts using [ETH brownie](https://eth-brownie.readthedocs.io/en/stable/install.html) a Python-based development and testing framework.

## Contract Github repository

Notional's V3 smart contracts repository can be found [here](https://github.com/notional-finance/).

## Setup

Here is a simple setup to start interacting with Notional V3 using ETH brownie:

```
import json
from brownie import (
    accounts, 
    interface
)
from brownie.network.state import Chain
import eth_abi

class V3Environment:
    def __init__(self):
        self.notional = interface.NotionalProxy("0x1344A36A1B56144C3Bc62E7757377D288fDE0369")
        self.owner = self.notional.owner()

def main():
    env = V3Environment()
    env.chain = Chain()
    env.notional.address
```

## Contract approval

To interact with the protocol using ERC-20 tokens, accounts must approve Notional's Proxy.

```
# Approve sending an unlimited amount of DAI to the Notional Proxy.
interface.ERC20(currencyAddress).approve(notional.address, 2**255, {'from': account}) 
```


---

# 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://docs.notional.finance/v3-technical-docs/contract-interaction-guides/intro.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.