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Showing content from https://python.langchain.com/docs/integrations/tools/compass below:

Compass LangChain Toolkit | 🦜️🔗 LangChain

Interact with various DeFi protocols. Non-custodial.Tools return unsigned transactions. The toolkit is built on top of a Universal DeFi API (Compass API) allowing agents to perform financial operations like:

• Swapping tokens on Uniswap and Aerodrome
• Lending or borrowing assets using protocols on Aave
• Providing liquidity on Aerodrome and Uniswap
• Transferring funds between wallets.
• Querying balances, portfolios and monitoring positions.

Here’s a sample of the tools this toolkit provides (subject to change daily):

• aave_supply: Supply assets to Aave to earn interest.
• aave_borrow: Borrow assets from Aave using collateral.
• uniswap_swap_sell_exactly: Swap a specific amount of one token on Uniswap.
• generic_portfolio_get: Retrieve a wallet’s portfolio in USD and token balances.
• generic_transfer_erc20: Transfer ERC20 tokens between addresses.

Here we will:

1. Install the langchain package
2. Import and instantiate the toolkit
3. Pass the tools to your agent with toolkit.get_tools()

This toolkit lives in the langchain-compass package:

%pip install -qU langchain-compass

To run these examples, ensure LangChain has access to an LLM service. For instance, if you're using GPT-4o, create a .env file containing:

# .env file
OPENAI_API_KEY=<your_openai_api_key_here>

Now we can instantiate our toolkit:

from langchain_compass.toolkits import LangchainCompassToolkit

toolkit = LangchainCompassToolkit(compass_api_key=None)

View available tools:

tools = toolkit.get_tools()
for tool in tools:
    print(tool.name)

# Expected output:

aave_supply
aave_borrow
aave_repay
aave_withdraw
aave_asset_price_get
aave_liquidity_change_get
aave_user_position_summary_get
...

To invoke a single tool programmatically:

tool_name = "generic_ens_get"
tool = next(tool for tool in tools if tool.name == tool_name)
tool.invoke({"ens_name": "vitalik.eth", "chain": "ethereum:mainnet"})

EnsNameInfoResponse(wallet_address='0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045', registrant='0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045')

We will need a LLM or chat model:

from dotenv import load_dotenv
from langchain_openai import ChatOpenAI

load_dotenv()

llm = ChatOpenAI(model="gpt-4o")

Initialize the agent with the tools:

from langgraph.prebuilt import create_react_agent

tools = toolkit.get_tools()
agent_executor = create_react_agent(llm, tools)

Example usage:

example_query = "please set an allowance on Uniswap of 10 WETH for vitalic.eth."  

events = agent_executor.stream(
    {"messages": [("user", example_query)]},
    stream_mode="values",
)
for event in events:
    event["messages"][-1].pretty_print()

Expected output:

================================ Human Message =================================

please set an allowance on Uniswap of 10 WETH for vitalic.eth.
================================== Ai Message ==================================
Tool Calls:
  generic_ens_get (call_MHIXRXxWH0L7iUEYHwvDUdU1)
 Call ID: call_MHIXRXxWH0L7iUEYHwvDUdU1
  Args:
    chain: ethereum:mainnet
    ens_name: vitalic.eth
================================= Tool Message =================================
Name: generic_ens_get

wallet_address='0x44761Ef63FaD902D8f8dC77e559Ab116929881Db' registrant='0x44761Ef63FaD902D8f8dC77e559Ab116929881Db'
================================== Ai Message ==================================
Tool Calls:
  generic_allowance_set (call_IEBftbtBfKCkI1zFXXtEY8tq)
 Call ID: call_IEBftbtBfKCkI1zFXXtEY8tq
  Args:
    amount: 10
    chain: ethereum:mainnet
    contract_name: UniswapV3Router
    sender: 0x44761Ef63FaD902D8f8dC77e559Ab116929881Db
    token: WETH
================================= Tool Message =================================
Name: generic_allowance_set

{"type": "unsigned_transaction", "content": {"chainId": 1, "data": "0x095ea7b300000000000000000000000068b3465833fb72a70ecdf485e0e4c7bd8665fc450000000000000000000000000000000000000000000000008ac7230489e80000", "from": "0x44761Ef63FaD902D8f8dC77e559Ab116929881Db", "gas": 46434, "to": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2", "value": 0, "nonce": 79, "maxFeePerGas": 2265376912, "maxPriorityFeePerGas": 6400594}}

langchain-compass is built on top of the Compass API. Each tool corresponds to an API endpoint. Please check out the docs here

• Tool conceptual guide
• Tool how-to guides

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