The method eth_maxPriorityFeePerGas does not exist/is not available

Hi,
I'm trying to perform a swap on spookyswap (fantom chain) using Uniswap-python.
However, I'm getting the following ValueError:

ValueError: {'code': -32601, 'message': 'the method eth_maxPriorityFeePerGas does not exist/is not available'}

I tried using multiple RPCs but all of them gave the same output.

NOTE:
I modified _netid_to_name in constats.py so that chainId 250 (fantom) is acceptable.

Code:

from uniswap import Uniswap

fantom_provider = 'https://rpc.ftm.tools/'

spookyswap_router_contract_addr = "0xf491e7b69e4244ad4002bc14e878a34207e38c29"

spookyswap_factory_contract_addr = "0x152eE697f2E276fA89E96742e9bB9aB1F2E61bE3"

weth_ftm = "0x74b23882a30290451A17c44f4F05243b6b58C76d"

dai_ftm = "0x8d11ec38a3eb5e956b052f67da8bdc9bef8abf3e"

amount = 0.00000001


spookyswap = Uniswap(address=spookyswap_address, private_key=spookyswap_private_key, version=version,
                    router_contract_addr=spookyswap_router_contract_addr,
                    factory_contract_addr=spookyswap_factory_contract_addr,
                    provider=fantom_provider)

spookyswap.make_trade(weth_ftm, dai_ftm, int(amount * 10**18), slippage = 0.2)

Full Error message:

Approving 0x74b23882a30290451A17c44f4F05243b6b58C76d...
Traceback (most recent call last):
  File "/Users/kuba/PycharmProjects/project/playground.py", line 111, in <module>
    print(spookyswap.make_trade(weth_ftm, dai_ftm, int(amount * 10**18), slippage = 0.2))
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/uniswap/decorators.py", line 29, in approved
    self.approve(token)
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/uniswap/uniswap.py", line 1053, in approve
    tx = self._build_and_send_tx(function)
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/uniswap/uniswap.py", line 1087, in _build_and_send_tx
    transaction = function.buildTransaction(tx_params)
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/contract.py", line 1079, in buildTransaction
    return build_transaction_for_function(
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/contract.py", line 1648, in build_transaction_for_function
    prepared_transaction = fill_transaction_defaults(web3, prepared_transaction)
  File "cytoolz/functoolz.pyx", line 250, in cytoolz.functoolz.curry.__call__
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/_utils/transactions.py", line 121, in fill_transaction_defaults
    default_val = default_getter(web3, transaction)
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/_utils/transactions.py", line 71, in <lambda>
    web3.eth.max_priority_fee + (2 * web3.eth.get_block('latest')['baseFeePerGas'])
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/eth.py", line 549, in max_priority_fee
    return self._max_priority_fee()
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/module.py", line 57, in caller
    result = w3.manager.request_blocking(method_str,
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/manager.py", line 198, in request_blocking
    return self.formatted_response(response,
  File "/Users/kuba/PycharmProjects/project/venv/lib/python3.9/site-packages/web3/manager.py", line 171, in formatted_response
    raise ValueError(response["error"])
ValueError: {'code': -32601, 'message': 'the method eth_maxPriorityFeePerGas does not exist/is not available'}

Please check what web3py version you use.

Please check what web3py version you use.

5.25.0

#216 (comment)

#216 (comment)

I modified TRANSACTION_DEFAULTS in transactions.py

TRANSACTION_DEFAULTS = {
    'value': 0,
    'data': b'',
    'gas': lambda web3, tx: web3.eth.estimate_gas(tx),
    'gasPrice': lambda web3, tx: web3.eth.generate_gas_price(tx) or web3.eth.gas_price,
    'maxFeePerGas': Wei(200000),
    'maxPriorityFeePerGas': Wei(200000),
    'chainId': lambda web3, tx: web3.eth.chain_id,
}

Now it looks like this, but I end up with an error while sending a transaction:

Traceback (most recent call last):
  File "/Users/kuba/PycharmProjects/Project/playground.py", line 112, in <module>
    spookyswap.make_trade(weth_ftm, dai_ftm, int(amount * 10**18), slippage = 0.2)
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/uniswap/decorators.py", line 29, in approved
    self.approve(token)
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/uniswap/uniswap.py", line 1053, in approve
    tx = self._build_and_send_tx(function)
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/uniswap/uniswap.py", line 1098, in _build_and_send_tx
    return self.w3.eth.send_raw_transaction(signed_txn.rawTransaction)
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/web3/eth.py", line 732, in send_raw_transaction
    return self._send_raw_transaction(transaction)
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/web3/module.py", line 57, in caller
    result = w3.manager.request_blocking(method_str,
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/web3/manager.py", line 198, in request_blocking
    return self.formatted_response(response,
  File "/Users/kuba/PycharmProjects/Project/venv/lib/python3.9/site-packages/web3/manager.py", line 171, in formatted_response
    raise ValueError(response["error"])
ValueError: {'code': -32000, 'message': 'rlp: expected List'}

Let's try the easier way. Rollback these changes, then here

uniswap-python/uniswap/uniswap.py

Line 1108 in fa9836e

def _get_tx_params(self, value: Wei = Wei(0)) -> TxParams:

change _get_tx_params() to this

def _get_tx_params(self, value: Wei = Wei(0)) -> TxParams:
        """Get generic transaction parameters."""
        return {
            "type": 0,
            "from": _addr_to_str(self.address),
            "value": value,
            "nonce": max(
                self.last_nonce, self.w3.eth.get_transaction_count(self.address)
            ),
        }

It should work. Otherwise, you'll need to add a couple of lines to this snippet, but I doubt it.

I rolled back changes and still, I'm getting the same error as initially:

ValueError: {'code': -32601, 'message': 'the method eth_maxPriorityFeePerGas does not exist/is not available'}

Ok, then this way

def _get_tx_params(self, value: Wei = Wei(0)) -> TxParams:
        """Get generic transaction parameters."""
        return {
            "type": 0,
            "from": _addr_to_str(self.address),
            "gas":  Wei(gas_value), #pass it any suitable way
            "gasPrice": Wei(gasPrice_value), #pass it any suitable way
            "value": value,
            "nonce": max(
                self.last_nonce, self.w3.eth.get_transaction_count(self.address)
            ),
        }

Of course, you may hardcode some values first just to test this snippet. If it still doesn't work, then their devs have made some significant changes.

EDIT: works fine now. This solved it. Thanks!
Unfortunately I got an error while signing the transaction : (

Hi,
I get the same Error and Tried both solutions.
#217 (comment) fixes my Problem, the other doesn't.
But now I get "TypeError: Unknown Transaction type: 0"

Did you fix your Error while signing the Transaction?

I am trying to use Pancakeswap (BSC)

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The method eth_maxPriorityFeePerGas does not exist/is not available #217

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