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Overview

The CDP SDK is compatible with the eth-account interface to sign messages, hashes, typed data, and transactions.

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Signer Examples

You can create a CDP Server Account and wrap it in EvmLocalAccount which is the class that is compatible with eth-account signers. You can call then sign* functions on the resulting account.

main.py
import asyncio
from cdp import CdpClient
from cdp.evm_local_account import EvmLocalAccount
from eth_account.messages import encode_defunct
from web3 import Web3
import dotenv

dotenv.load_dotenv()

async def main():
    cdp = CdpClient()

    server_account = await cdp.evm.create_account()
    print(f"Successfully created account: {server_account.address}")

    account = EvmLocalAccount(server_account)

    # 1. Sign a message
    message = "Hello, world!"
    signable_message = encode_defunct(text=message)
    signed_message = account.sign_message(signable_message)
    print("Signed message: ", signed_message)

    # 2. Sign a hash
    hash = "0x1234567890123456789012345678901234567890123456789012345678901234"
    signed_hash = account.unsafe_sign_hash(hash)
    print("Signed hash: ", signed_hash)

    # 3. Sign typed data
    typed_data = {
        "domain": {
            "name": "MyDomain",
            "version": "1",
            "chainId": 1,
            "verifyingContract": "0x0000000000000000000000000000000000000000",
        },
        "types": {
            "EIP712Domain": [
                {"name": "name", "type": "string"},
                {"name": "version", "type": "string"},
                {"name": "chainId", "type": "uint256"},
                {"name": "verifyingContract", "type": "address"},
            ],
            "Person": [
                {"name": "name", "type": "string"},
                {"name": "wallet", "type": "address"},
            ],
        },
        "primaryType": "Person",
        "message": {
            "name": "John Doe",
            "wallet": "0x1234567890123456789012345678901234567890",
        },
    }
    signed_typed_data = account.sign_typed_data(
        full_message=typed_data,
    )
    print("Signed typed data: ", signed_typed_data)

    # 4. Sign a transaction
    w3 = Web3(Web3.HTTPProvider("https://sepolia.base.org"))
    nonce = w3.eth.get_transaction_count(account.address)
    transaction = account.sign_transaction(
        transaction_dict={
            "to": "0x000000000000000000000000000000000000dEaD",
            "value": 10000000000,
            "chainId": 84532,
            "gas": 21000,
            "maxFeePerGas": 1000000000,
            "maxPriorityFeePerGas": 1000000000,
            "nonce": nonce,
            "type": "0x2",
        }
    )
    print("Signed transaction: ", transaction)

    await cdp.close()


asyncio.run(main())

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Send Transaction Example

Once you have signed your transaction, you can use web3 to send it.

Here’s an example:

main.py
import asyncio
from cdp import CdpClient
from cdp.evm_local_account import EvmLocalAccount
from web3 import Web3
import dotenv

dotenv.load_dotenv()

async def main():
    cdp = CdpClient()

    server_account = await cdp.evm.create_account()
    print(f"Successfully created account: {server_account.address}")

    account = EvmLocalAccount(server_account)

    w3 = Web3(Web3.HTTPProvider("https://sepolia.base.org"))
    nonce = w3.eth.get_transaction_count(account.address)
    transaction = account.sign_transaction(
        transaction_dict={
            "to": "0x000000000000000000000000000000000000dEaD",
            "value": 10000000000,
            "chainId": 84532,
            "gas": 21000,
            "maxFeePerGas": 1000000000,
            "maxPriorityFeePerGas": 1000000000,
            "nonce": nonce,
            "type": "0x2",
        }
    )
    print("Signed transaction: ", transaction)

    print("\nRequesting ETH from faucet for account...")
    faucet_hash = await cdp.evm.request_faucet(
        address=account.address, network="base-sepolia", token="eth"
    )
    w3.eth.wait_for_transaction_receipt(faucet_hash)
    print("Received funds from faucet...")

    tx_hash = w3.eth.send_raw_transaction(transaction.raw_transaction)
    print(f"Transaction sent! Hash: {tx_hash.hex()}")

    await cdp.close()


asyncio.run(main())