pyWalletConnect: A Python Library for WalletConnect Integration

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Integrating decentralized applications (dApps) with crypto wallets has become a cornerstone of the Web3 experience. pyWalletConnect is a powerful Python3 library that enables developers to connect their Python-based wallets to any Web3 dApp using the widely adopted WalletConnect protocol. Whether you're building a command-line wallet, a desktop application, or a backend service, pyWalletConnect streamlines secure, encrypted communication between your wallet and dApps through an easy-to-use interface.

This open-source solution abstracts the entire WalletConnect stack — from WebSocket transport and TLS encryption to JSON-RPC handling and session management — allowing developers to focus on core wallet functionality rather than infrastructure complexity.

How pyWalletConnect Works

At its core, pyWalletConnect implements the wallet side of the WalletConnect standard. When a dApp initiates a connection via a WalletConnect URI, your Python wallet uses pyWalletConnect to establish a secure, end-to-end encrypted tunnel through a relay server. Once connected, the dApp can send JSON-RPC requests such as eth_sign or eth_sendTransaction, which your wallet processes, prompts the user for approval, signs the transaction, and returns the result securely.

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The library automatically manages:

This full-stack automation ensures reliable, production-ready interoperability with thousands of existing dApps across Ethereum and EVM-compatible blockchains.

Installation and Setup

pyWalletConnect supports Python 3.7 and above, making it compatible with modern development environments.

To install from PyPI:

python3 -m pip install pyWalletConnect

Alternatively, install directly from source:

python3 -m pip install .

After installation, import the main client class:

from pywalletconnect import WCClient, WCClientInvalidOption

Establishing a WalletConnect Session

Start by initializing the client using a WalletConnect URI generated by the dApp:

string_uri = input("Input the WalletConnect URI: ")

Before creating the session, set optional metadata (recommended for better UX in dApps):

WCClient.set_wallet_metadata({
    "name": "My Python Wallet",
    "description": "A lightweight wallet built in Python",
    "url": "https://mypythonwallet.example",
    "icons": ["https://mypythonwallet.example/icon.png"]
})

For WalletConnect v2, you must provide a project ID:

WCClient.set_project_id("your-walletconnect-project-id")

Now create the client instance:

try:
    wallet_dapp = WCClient.from_wc_uri(string_uri)
except WCClientInvalidOption as exc:
    if hasattr(wallet_dapp, "wc_client"):
        wallet_dapp.close()
    raise InvalidOption(exc)

Call open_session() to wait for the session request:

req_id, chain_ids, request_info = wallet_dapp.open_session()

Validate chain compatibility:

if str(account.chainID) not in chain_ids:
    wallet_dapp.close()
    raise InvalidOption("Chain ID mismatch.")

Prompt user for approval:

user_ok = input(f"Connection request from: {request_info['name']}. Approve? [y/N]")
if user_ok.lower() == "y":
    wallet_dapp.reply_session_request(req_id, account.chainID, account.address)
else:
    wallet_dapp.reject_session_request(req_id)
    wallet_dapp.close()
    raise UserInteraction("User rejected connection.")

Once approved, the session remains active until manually closed or terminated by the dApp.

Handling Incoming Requests

With an open session, your wallet should periodically poll for incoming messages using .get_message(). This non-blocking method retrieves one request at a time from an internal FIFO queue.

A typical polling loop might look like this:

def watch_messages():
    wc_message = wallet_dapp.get_message()
    while wc_message[0] is not None:
        call_id, method, params = wc_message
        if method == "eth_sendTransaction":
            approve = input("Approve transaction? (y/N): ")
            if approve == 'y':
                tx_hash = process_sendtransaction(call_id, params[0])
                wallet_dapp.reply(call_id, tx_hash)
            else:
                wallet_dapp.reply_error(call_id, "User rejected request", 4001)
        elif method == "eth_sign":
            # Handle signing request
            signature = process_sign(params[1])
            wallet_dapp.reply(call_id, signature)
        # Handle other methods...
        wc_message = wallet_dapp.get_message()

Use a timer or background thread to call watch_messages() every 3–6 seconds for responsive behavior.

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To enhance discoverability and align with search intent, key terms naturally integrated throughout this article include:

These keywords reflect common developer queries related to integrating Python-based tools into decentralized ecosystems.

Frequently Asked Questions

Q: Is pyWalletConnect compatible with both WalletConnect v1 and v2?
A: Yes, from_wc_uri() supports both versions. However, v2 requires setting a project ID via set_project_id().

Q: Can I use pyWalletConnect in a GUI application?
A: Absolutely. Use threading or async loops to run get_message() periodically without blocking the UI.

Q: Does it support non-EVM blockchains?
A: By default, it uses eip155 namespace (EVM chains), but you can customize supported namespaces using set_wallet_namespace().

Q: How does message encryption work?
A: pyWalletConnect handles encryption automatically via the WalletConnect protocol using symmetric keys negotiated during pairing.

Q: What happens if the relay server disconnects?
A: The library automatically attempts reconnection when get_message() is called, ensuring resilience against temporary outages.

Q: Is user input required for every transaction?
A: That’s up to your implementation. Best practices recommend explicit user confirmation for all sensitive actions like signing or sending funds.

Final Notes and Support

pyWalletConnect is licensed under the GNU General Public License v3, ensuring freedom to use, modify, and distribute the software. It's maintained by BitLogiK SAS with active community contributions.

For troubleshooting or feature requests, visit the official GitHub repository and open an issue. The clear API design and thorough documentation make it ideal for developers entering the Web3 space with Python.

Whether you're prototyping a new wallet concept or scaling an existing toolset, pyWalletConnect delivers robust, secure connectivity that adheres to industry standards — all within the simplicity of Python.

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