LangChain Privy Integration

Enable LangChain agents to create and manage Privy wallets for blockchain operations.

Overview

langchain-privy provides a seamless integration between LangChain and Privy's wallet infrastructure, allowing AI agents to:

• Automatically create and manage wallets - No user accounts required!
• Sign messages and transactions using Privy wallets
• Execute multi-chain blockchain operations (Ethereum, Base, Polygon, Solana, etc.)
• Manage wallet operations with built-in security policies

Installation

pip install langchain-privy

Quick Start

import os
from langchain_privy import PrivyWalletTool
from langchain.agents import create_agent
from langchain_openai import ChatOpenAI

# Set your Privy credentials (or use environment variables)
os.environ["PRIVY_APP_ID"] = "your-privy-app-id"
os.environ["PRIVY_APP_SECRET"] = "your-privy-app-secret"

# Initialize Privy wallet tool (automatically creates a wallet!)
privy_tool = PrivyWalletTool()

print(f"Wallet created! Address: {privy_tool.wallet_address}")
print(f"Wallet ID: {privy_tool.wallet_id}")

# Create an agent with wallet capabilities
agent = create_agent(
    model=ChatOpenAI(temperature=0, model="gpt-4"),
    tools=[privy_tool],
    system_prompt="You are a helpful wallet assistant that can manage cryptocurrency wallets.",
)

# Agent can now perform wallet operations
result = agent.invoke({"messages": [("user", "What is my wallet address?")]})
print(result["messages"][-1].content)

result = agent.invoke({"messages": [("user", "Sign the message 'Hello from LangChain!'")]})
print(result["messages"][-1].content)

That's it! No user management, no complex setup - just simple wallet operations for your AI agents.

Features

Multi-Chain Support

The integration supports all chains available in Privy:

• EVM chains: Ethereum, Base, Polygon, Arbitrum, Optimism, and more
• Solana
• Bitcoin (view-only operations)

Wallet Operations

• get_wallet_address - Retrieve wallet addresses for different chains
• get_balance - Query wallet balances
• sign_message - Sign arbitrary messages
• send_transaction - Execute blockchain transactions
• sign_transaction - Sign transactions without broadcasting

Security Features

• Server-side authentication using Privy App Secrets
• Automatic request signing and authorization
• Support for Privy's transaction policies
• Built-in rate limiting and error handling

Advanced Usage

Creating Wallets on Specific Chains

from langchain_privy import PrivyWalletTool

# Create a Solana wallet instead of Ethereum
solana_tool = PrivyWalletTool(chain_type="solana")
print(f"Solana wallet: {solana_tool.wallet_address}")

# Create a Base wallet
base_tool = PrivyWalletTool(chain_type="base")
print(f"Base wallet: {base_tool.wallet_address}")

Reusing Existing Wallets

# Use an existing wallet ID (from previous session)
existing_wallet_id = "wal_abc123..."
tool = PrivyWalletTool(wallet_id=existing_wallet_id)

# The tool will use this wallet for all operations

Listing and Managing Wallets

from langchain_privy import PrivyAuth, PrivyConfig

# Initialize auth client
config = PrivyConfig.from_env()
auth = PrivyAuth(config)

# List all wallets for your app
result = auth.list_wallets(chain_type="ethereum")
for wallet in result['data']:
    print(f"Wallet {wallet['id']}: {wallet['address']}")

# Create a new wallet programmatically
new_wallet = auth.create_wallet(chain_type="polygon")
print(f"Created wallet: {new_wallet['address']}")

Multi-Chain Operations

# Create different tools for different chains
eth_tool = PrivyWalletTool(chain_type="ethereum")
sol_tool = PrivyWalletTool(chain_type="solana")

# Each tool manages its own wallet
tool.send_transaction(
    chain="base",
    to="0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
    value="0.01",
    unit="ether"
)

Configuration

Environment Variables

PRIVY_APP_ID=your-app-id
PRIVY_APP_SECRET=your-app-secret
PRIVY_API_URL=https://auth.privy.io  # Optional, defaults to production

Python Configuration

from langchain_privy import PrivyWalletTool, PrivyConfig

config = PrivyConfig(
    app_id="your-app-id",
    app_secret="your-app-secret",
    api_url="https://auth.privy.io",
    timeout=30  # Request timeout in seconds
)

tool = PrivyWalletTool(config=config, user_id="did:privy:xxx")

Example

Check out the examples directory for a complete working implementation:

• Chat Agent - Interactive chat interface with wallet operations

To run the example:

cd examples
pip install -r requirements.txt

# Set your credentials
export PRIVY_APP_ID="your-app-id"
export PRIVY_APP_SECRET="your-app-secret"
export OPENAI_API_KEY="your-openai-key"

# Run the chat agent
python chat_agent.py

The chat agent demonstrates:

• Automatic wallet creation
• Interactive conversation with tool calling
• Natural language wallet operations
• Multi-chain address queries
• Balance checking

Architecture

┌─────────────────────────────────────────────────────────────┐
│                     LangChain Agent                         │
│                                                             │
│  ┌───────────────────────────────────────────────────────┐  │
│  │            PrivyWalletTool (LangChain Tool)           │  │
│  └───────────────────────────────────────────────────────┘  │
│                            │                                │
└────────────────────────────┼────────────────────────────────┘
                             │
                             ▼
┌─────────────────────────────────────────────────────────────┐
│                   langchain-privy                           │
│                                                             │
│  ┌─────────────┐  ┌──────────────┐  ┌──────────────────┐    │
│  │   Auth      │  │  RPC Client  │  │  Chain Config    │    │
│  │   Module    │  │              │  │                  │    │
│  └─────────────┘  └──────────────┘  └──────────────────┘    │
└────────────────────────────┬────────────────────────────────┘
                             │
                             ▼
┌─────────────────────────────────────────────────────────────┐
│                      Privy API                              │
│                                                             │
│  • Wallet Authentication                                    │
│  • Transaction Signing                                      │
│  • Multi-Chain Support                                      │
│  • Embedded Wallet Management                               │
└─────────────────────────────────────────────────────────────┘

Development

Setup

# Clone the repository
git clone https://github.com/privy-io/privy.git
cd public-packages/langchain-privy

# Install in development mode
pip install -e ".[dev]"

Testing

# Run tests
pytest

# Run with coverage
pytest --cov=langchain_privy --cov-report=html

# Run specific test file
pytest tests/test_wallet_tool.py

Linting and Formatting

# Format code
black langchain_privy tests

# Lint
ruff check langchain_privy tests

# Type checking
mypy langchain_privy

Contributing

Contributions are welcome! Please read our Contributing Guide for details on our code of conduct and the process for submitting pull requests.

License

MIT License - see LICENSE file for details.

Support

• Documentation: https://docs.privy.io
• Slack: https://privy-developers.slack.com
• Email: support@privy.io

Related Projects

• Privy React SDK
• Privy Server Auth
• LangChain