Get TRC20 balance and Transfer TRC20 tokens

trc20.py

import requests
import base58
import base64
from pprint import pprint


ADDRESS = "T....your address"
PRIV_KEY = 'hex private key'

CONTRACT = "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t"  # USDT
CONTRACT = "T,,,,,,,,,,,,,,,,,,,,,,ia"

API_URL_BASE = 'https://api.trongrid.io/'
# API_URL_BASE = 'https://api.shasta.trongrid.io/'
# API_URL_BASE = 'https://api.nileex.io/'

# 70a08231: balanceOf(address)
METHOD_BALANCE_OF = 'balanceOf(address)'

# a9059cbb: transfer(address,uint256)
METHOD_TRANSFER = 'transfer(address,uint256)'


DEFAULT_FEE_LIMIT = 1_000_000  # 1 TRX


def address_to_parameter(addr):
    return "0" * 24 + base58.b58decode_check(addr)[1:].hex()


def amount_to_parameter(amount):
    return '%064x' % amount


def get_balance(address=ADDRESS):
    url = API_URL_BASE + 'wallet/triggerconstantcontract'
    payload = {
        'owner_address': base58.b58decode_check(ADDRESS).hex(),
        'contract_address': base58.b58decode_check(CONTRACT).hex(),
        'function_selector': METHOD_BALANCE_OF,
        'parameter': address_to_parameter(address),
    }
    resp = requests.post(url, json=payload)
    data = resp.json()

    if data['result'].get('result', None):
        print(data['constant_result'])
        val = data['constant_result'][0]
        print('balance =', int(val, 16))
    else:
        print('error:', bytes.fromhex(data['result']['message']).decode())


def get_trc20_transaction(to, amount, memo=''):
    url = API_URL_BASE + 'wallet/triggersmartcontract'
    payload = {
        'owner_address': base58.b58decode_check(ADDRESS).hex(),
        'contract_address': base58.b58decode_check(CONTRACT).hex(),
        'function_selector': METHOD_TRANSFER,
        'parameter': address_to_parameter(to) + amount_to_parameter(amount),
        "fee_limit": DEFAULT_FEE_LIMIT,
        'extra_data': base64.b64encode(memo.encode()).decode(),  # TODO: not supported yet
    }
    resp = requests.post(url, json=payload)
    data = resp.json()

    if data['result'].get('result', None):
        transaction = data['transaction']
        return transaction

    else:
        print('error:', bytes.fromhex(data['result']['message']).decode())
        raise RuntimeError


def sign_transaction(transaction, private_key=PRIV_KEY):
    url = API_URL_BASE + 'wallet/addtransactionsign'
    payload = {'transaction': transaction, 'privateKey': private_key}
    resp = requests.post(url, json=payload)

    data = resp.json()

    if 'Error' in data:
        print('error:', data)
        raise RuntimeError
    return data


def broadcast_transaction(transaction):
    url = API_URL_BASE + 'wallet/broadcasttransaction'
    resp = requests.post(url, json=transaction)

    data = resp.json()
    print(data)


def transfer(to, amount, memo=''):
    transaction = get_trc20_transaction(to, amount, memo)
    pprint(transaction)
    transaction = sign_transaction(transaction)
    broadcast_transaction(transaction)


get_balance()

transfer('T..............q', 5_000, 'test from python')

Sending the pkey to some site? Even if it's api.trongrid.io...
Why we can't sign our transaction? It comes super weird to me.
Is there are any way to do it without sending pkey?
Edit: Just use this...

agree it, this method seem not secure

@EUA @G33kNoob I suggest you to check tronpy library, which signs transactions locally :D

Thanks @ygboucherk; Correct tronpy has a .sign function. See Here
cc: @EUA @G33kNoob

Here's a custom extract leveraging the tronpy library

from tronpy.keys import PrivateKey

def sign_transaction_offine(self, transaction_object, your_tron_private_key):
        # CONVERT PRIVATE KEY TO BYTES
        private_key_bytes = bytes.fromhex(your_tron_private_key)
        
        # CONVERT INITIATED TRANSACTION ID TO BYTES
        transaction_id_bytes = bytes.fromhex(transaction_object["txID"]

        # SIGN TRANSACTION
        data = PrivateKey(private_key_bytes=private_key_bytes).sign_msg_hash(transaction_id_bytes))
        return data

Call your function and proceed to broadcast

How to get the balance of a TRX wallet itself? Not a TRC20 token, but TRX

can anybody give more information (best practice) how to transfer trc20 and sign it offline?

https://tronpy.readthedocs.io/en/latest/contract.html#trigger-call

Hiii @ikamran, to further buttress what my Boss @andelf posted. Let's presume you want to transfer USDT (a trc20 contract). There are 3 basic steps:

1. Create transaction
2. Sign transaction (Offline)
3. Broadcast transaction to the network

Create

Use the get_trc20_transaction function in @andelf's initial gist above to Create your transaction

Sign Transaction

from tronpy.keys import PrivateKey

def sign_transaction_offine(self, transaction_object, your_tron_private_key):
        # CONVERT PRIVATE KEY TO BYTES
        private_key_bytes = bytes.fromhex(your_tron_private_key)
        
        # CONVERT INITIATED TRANSACTION ID TO BYTES
        transaction_id_bytes = bytes.fromhex(transaction_object["txID"]

        # SIGN TRANSACTION
        data = PrivateKey(private_key_bytes=private_key_bytes).sign_msg_hash(transaction_id_bytes))
        return data

Broadcast

Use the broadcast_transaction function in @andelf's initial gist to Broadcast the transaction to the network

Thanks for your help, according to your last email I already did it successfully without any issue the issue comes when I want to send from a multi-signiture address

from tronpy import Tron
from tronpy.keys import PrivateKey

client = Tron(network='nile', conf={'fee_limit': 10_000_000})

priv_key = PrivateKey(bytes.fromhex("e5f4a4acb3ecef9e8589d69c1aa9fa5723b04ff724b1c04ebe6cd746b241ad04"))
contractAddress = 'TLBaRhANQoJFTqre9Nf1mjuwNWjCJeYqUL'
myAddress = 'TGihHToJJ9B1NFi2Vx5bTM8muRmsbdAaJ8'
contract = client.get_contract(contractAddress)

oneUSDJ = 1_000_000_000_000_000_000

class Tron:
    def __init__(self):
        self.contract = contract
        self.myAdd = myAddress

    def getTokenBalance(self):
        return contract.functions.balanceOf(myAddress) / 10 ** 6

    def getBalance(self, address):
        return client.get_account_balance(address)

    def getAccount(self, address):
        return client.get_account(address)


    def sendTRX(self, accountAddress):
        txn = (
            client.trx.transfer(myAddress, accountAddress, 100_000_000)
                .with_owner(myAddress)
                .permission_id(2)
                .build()
                .sign(priv_key)
        )

        print(txn.txid)
        print(txn.broadcast().wait())
        return txn

tron = Tron()

I included permission_id but I got this error:

>>> tron.sendTRX('TC2r7dPEfMaMt8ToJ3rQ7SuVhX391cFhv5')
{'address': '414a0a401872a17daf91e753226e8981e434e97452', 'weight': 1}
a6c802ca8cbfd1562e6203a43437b98f30aef7b09f2d968be213afe56746c864
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\itk\dev\test\tronpy\example1.py", line 38, in sendTRX
    print(txn.broadcast().wait())
  File "C:\Users\itk\dev\test\venv\lib\site-packages\tronpy\tron.py", line 154, in broadcast
    return TransactionRet(self._client. Broadcast(self), client=self._client, method=self._method)
  File "C:\Users\itk\dev\test\venv\lib\site-packages\tronpy\tron.py", line 827, in broadcast
    self._handle_api_error(payload)
  File "C:\Users\itk\dev\test\venv\lib\site-packages\tronpy\tron.py", line 467, in _handle_api_error
    raise BadSignature(msg)
tronpy.exceptions.BadSignature: Validate signature error: sig error