PERMIT2

[johann75sch]

I am stuck for a few days and do not understand what my mistake is:
`
trx_params = {
'from': acc.address,
'gas': 58_000,
'maxPriorityFeePerGas': w3.eth.max_priority_fee,
'maxFeePerGas': int(w3.eth.gas_price * 1.3),
'type': '0x2',
'chainId': chain_id,
'value': 0,
'nonce': w3.eth.get_transaction_count(acc.address)
}

amount, expiration, nonce = codec.fetch_permit2_allowance(wallet=acc.address,
token=usdc_address,
spender=ur_address,
permit2=permit2_address,
permit2_abi=permit2_abi
) # where acc is your LocalAccount

deadline = int(time.time()) + 600

data, signable_message = codec.create_permit2_signable_message(
token_address=usdc_address,
amount=1000000,
expiration=deadline,
nonce=nonce, # Permit2 nonce
spender=ur_address, # The UR checksum address
deadline=deadline,
chain_id=chain_id,
verifying_contract=permit2_address
)

signed_message = acc.sign_message(signable_message) # where acc is your LocalAccount
encoded_data = codec.encode.chain().permit2_permit(data, signed_message).build(deadline)

trx_params['data'] = encoded_data
signed_trx = w3.eth.account.sign_transaction(trx_params, private).raw_transaction
tx_hash = w3.eth.send_raw_transaction(signed_trx)
receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
print (f'[+] Approved PERMIT2 at TOKEN contract: {tx_hash}\n[>] {receipt}')

amount, expiration, nonce = codec.fetch_permit2_allowance(acc.address, usdc_address) # where acc is your LocalAccount
print(f'Permit2 amount: {amount}, expiration: {expiration}, nonce: {nonce} ')
`

[Elnaril]

Hello @johann75sch !
Could you please:

• provide the print results
• provide the error if any
• format correctly your code

Thanks

[johann75sch]

Di not expect you to reply sir. I might just not understand something and waste your time with it.
AttributeDict({'blockHash': HexBytes('0x7446c10267251da1c134e7d3deab366b98e87a7c7d5525af5fc94b415ae9c1b5'), 'blockNumber': 28782268, 'contractAddress': '0x265E0113CEEA51664a8682d500D359023d101c12', 'cumulativeGasUsed': 40764784, 'effectiveGasPrice': 891681, 'from': '0x97Ccb60eFF6dF08f76b145797273C06e7e317083', 'gasUsed': 58000, 'l1BaseFeeScalar': '0x8dd', 'l1BlobBaseFee': '0x45cf0', 'l1BlobBaseFeeScalar': '0x101c12', 'l1Fee': '0xc6e7dca9', 'l1GasPrice': '0x19b1a939', 'l1GasUsed': '0xd13', 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 0, 'to': None, 'transactionHash': HexBytes('0xb8e4553df1f03c611cafee4150aaf90e2489c4c6ed56494f555e9c6a371ab927'), 'transactionIndex': 155, 'type': 2})

With my earlier code without the library, what I understood, you need to permit the permit and then permit the router. That worked for me.
approve_permit = usdt_token.functions.approve(PERMIT_ADDRESS, amount)
approve_router = permit.functions.approve(USDT_ADDRESS, ROUTER_ADDRESS, amount, deadline)

[Elnaril]

Have you followed precisely this tutorial?

[johann75sch]

No, I am using v3 without swap, just permit and live on Base.

[Elnaril]

You use Permit2 with the UR the same way for V2/V3/V4. If you don't swap, just remove the swap part from the tutorial.

I can see 2 issues:

• You sent your transaction without recipient ('to': None), hence the EVM tried to create a contract at address 0x265e0113ceea51664a8682d500d359023d101c12 and failed. You must send it to the UR.
• you sent value=10000000 wei in your transaction on Base. If you just call the PERMIT2_PERMIT function, you should send 0 ETH.

Can you try after fixing these points?

[johann75sch]

Waw, all perfectly works!!!! Thank you. Not only a grate librady, but also support +++++
So, this permit amount is in ETH? Crazy...
allowance_amount = 2**160 - 1 # max/infinite

[Elnaril]

Waw, all perfectly works!!!!

Great!

Not only a grate librady, but also support +++++

Thank you! 😀 Feel free to spread the word and star/follow the lib, if not already done!

So, this permit amount is in ETH? Crazy...
allowance_amount = 2**160 - 1 # max/infinite

Well, this amount is in Wei, but this particular value is a flag that instructs the Permit2 contract to always allow any amount.

BTW, could you please mark the answer as such?

Happy coding!