uniswap-sdk 0.3.2

uniswap-sdk: SDK for Uniswap smart contracts

Uniswap SDK

Ape-based SDK for working with deployments of Uniswap protocol

Dependencies

• python3 version 3.10 or greater, python3-dev

Installation

via pip

You can install the latest release via pip:

pip install uniswap_sdk

via setuptools

You can clone the repository and use setuptools for the most up-to-date version:

git clone https://github.com/SilverBackLtd/uniswap-sdk.git
cd uniswap-sdk
python3 setup.py install

Quick Usage

Scripting

The SDK can be used for any scripting task very easily:

>>> from ape_tokens import tokens
>>> from uniswap_sdk import Uniswap
>>> uni = Uniswap(use_v3=False)  # Can skip versions and only index certain tokens
>>> list(uni.index(tokens=tokens))  # Takes time, but makes planning faster (recommended for scripting)
>>> uni.price("UNI", "USDC")  # Get liquidity-weighted prices of entire index in real-time
Decimal("4.75")
>>> usdc = tokens["USDC"]
>>> tx = uni.swap(
...     "UNI",
...     usdc,  # Can use any ContractInstance type
...     amount_in="12 UNI",  # Uses Ape's conversion system
...     slippage=0.3,
...     deadline=timedelta(minutes=2),
...     sender=trader,
... )

To swap directly with Ether (native token, NOT ERC20):

>>> uni.swap(want="UNI", sender=trader, value="1 ether")
# OR
>>> uni.swap(want="UNI", amount_out="10 UNI", sender=trader, value="1 ether")
# OR
>>> uni.swap(have="UNI", amount_in="10 UNI", native_out=True, ...)

If have= is not present but value= is, then have= will be set to WETH (if available on your network) for solving. If amount_in=, max_amount_in=, and amount_out= are not present (1st example), then value= will work like amount_in=. If amount_out is present (2nd example), then value= will act like setting max_amount_in=. If native_out=True is present (3rd example), then the amount received will be native ether and not an ERC20.

CLI

This SDK installs a special CLI command uni. You can use this command to do common tasks with the SDK such as finding prices or performing swaps.

Try uni --help after installing the SDK to learn more about what the CLI can do.

Silverback

The SDK has special support for use within Silverback bots, which takes advantage of real-time processing to drastically reduce the overhead of certain search and solver functions of the SDK:

from ape_tokens import tokens
from silverback import SilverbackBot
from uniswap_sdk import Uniswap

bot = SilverbackBot()
uni = Uniswap()
uni.install(bot)  # This replaces having to do `uni.index()`

# NOTE: The bot will now process all swaps in the background to keep it's indexes up-to-date!

@bot.cron("* * * * *")
async def weth_price(t):
    # So now when you use top-level functions, it takes advantage of cached data in the index
    return uni.price("WETH", "USDC")  # This executes faster w/ Silverback!

Custom Solver

The SDK comes with a default Solver that should be performant enough for most situations. However, it is likely that you will want to design a custom solver function or class in order to obtain better results when performing actions like uni.swap which leverage the solver.

You can override the default solver by providing a function or object which matches the following interface:

from uniswap_sdk import Order
Route = tuple[PairType, ...]  # 1 (or more) `PairType`s (e.g. `UniswapV2Pair`, etc.)
Solution = dict[Route, Decimal]  # mapping of Route -> amount to swap via Route
SolverType = Callable[[Order, Iterable[Route]], Solution]
# Given `amount` of `token` and `*routes`, find `solution`

This can be a class, allowing more flexibility in how you design your solver:

class Solver:
    def __call__(self, order: Order, routes: Iterable[Route]) -> Solution:
        # This function must match `SolverType` to work

my_solver = Solver(...)

uni = Uniswap(use_solver=my_solver)
uni.solve(...)  # Will now use `my_solver` to find solutions (also `uni.swap`)

Development

This project is in development and should be considered a beta. Things might not be in their final state and breaking changes may occur. Comments, questions, criticisms and pull requests are welcomed.

Support

Support for various Uniswap-related protocols:

• V1
• V2
• V3
• V4
• Permit2
• UniversalRouter

License

This project is licensed under the Apache 2.0.