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How to access Uniswap on Polygon network?#246

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roya12 asked this question inQ&A
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Hello, newbie here. I'm trying to use this package to access Uniswap on Polygon network. I changed the provider to a free matic RPC (provided by Maticvigil) and provided the relevant token addresses on the Matic network, but the script returns an error. How do I access the swaps information on Uniswap's Polygon chain (Or other chains like BNB / Fantom / Xdai / etc.)? Thanks!

from uniswap import Uniswapaddress = ""          # or None if you're not going to make transactionsprivate_key = ""  # or None if you're not going to make transactionsversion = 3                       # specify which version of Uniswap to useprovider = "https://rpc-mainnet.maticvigil.com/v1/<maticvigil-key>"    # can also be set through the environment variable `PROVIDER`uniswap = Uniswap(address=address, private_key=private_key, version=version, provider=provider)# MATIC Some token addresses we'll be using later in this guidematic = "0x0000000000000000000000000000000000001010"dai = "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063"print (uniswap.get_price_input(matic, dai, 10**18))
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Replies: 2 comments 4 replies

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Please, post the error message. From what I see, this snippet should work correctly.

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1 reply
@roya12
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Hello, I have attached the error message below (I'm running on Windows with Python 3.9.10). Thank you.

D:\py-projects\uniswap>py uniswap-2.pyNo fee set, assuming 0.3%Traceback (most recent call last):  File "D:\py-projects\uniswap\uniswap-2.py", line 14, in <module>    uniswap.get_price_input(matic, dai, 10**18)  File "C:\Python39\lib\site-packages\uniswap\uniswap.py", line 198, in get_price_input    return self._get_token_token_input_price(token0, token1, qty, fee, route)  File "C:\Python39\lib\site-packages\uniswap\uniswap.py", line 296, in _get_token_token_input_price    price = self.quoter.functions.quoteExactInputSingle(  File "C:\Python39\lib\site-packages\web3\contract.py", line 957, in call    return call_contract_function(  File "C:\Python39\lib\site-packages\web3\contract.py", line 1501, in call_contract_function    return_data = web3.eth.call(  File "C:\Python39\lib\site-packages\web3\module.py", line 57, in caller    result = w3.manager.request_blocking(method_str,  File "C:\Python39\lib\site-packages\web3\manager.py", line 198, in request_blocking    return self.formatted_response(response,  File "C:\Python39\lib\site-packages\web3\manager.py", line 170, in formatted_response    apply_error_formatters(error_formatters, response)  File "C:\Python39\lib\site-packages\web3\manager.py", line 70, in apply_error_formatters    formatted_resp = pipe(response, error_formatters)  File "cytoolz/functoolz.pyx", line 667, in cytoolz.functoolz.pipe    return c_pipe(data, funcs)  File "cytoolz/functoolz.pyx", line 642, in cytoolz.functoolz.c_pipe    data = func(data)  File "C:\Python39\lib\site-packages\web3\_utils\method_formatters.py", line 580, in raise_solidity_error_on_revert    raise ContractLogicError('execution reverted')web3.exceptions.ContractLogicError: execution reverted
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I'm not sure if they have a 0.3% pool there, tryfee=500 in constructor params like
uniswap = Uniswap(address=address, private_key=private_key, version=version, provider=provider, fee=500)

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3 replies
@roya12
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Tried, however, it seems that 'fee' is not part of the params in the Uniswap class

Traceback (most recent call last):  File "d:\py-projects\uniswap\uniswap-2-matic.py", line 9, in <module>    uniswap = Uniswap(address=address, private_key=private_key, version=version, provider=provider, fee=500) TypeError: __init__() got an unexpected keyword argument 'fee'

classuniswap.Uniswap(address: Optional[Union[Address, ChecksumAddress, str]], private_key: Optional[str], provider: Optional[str] = None, web3: Optional[web3.main.Web3] = None, version: int = 1, default_slippage: float = 0.01, use_estimate_gas: bool = True, factory_contract_addr: Optional[str] = None, router_contract_addr: Optional[str] = None)

@ErikBjare
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I think@liquid-8 was a bit too quick there.

Thefee argument is on theget_price_input/output methods:http://uniswap-python.com/api.html#uniswap.Uniswap.get_price_input

If you configure logging correctly, it should emit a warning thatfee was implicitly set to 3000 (0.3%).

@roya12
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Sure, I have tried changing to the following:

print (uniswap.get_price_input(matic, dai, 10**18, fee=500))

However, the script indicates an error in that line:

Traceback (most recent call last):  File "d:\py-projects\uniswap\uniswap-2-matic.py", line 14, in <module>    print (uniswap.get_price_input(matic, dai, 10**18, fee=500))  File "C:\Python39\lib\site-packages\uniswap\uniswap.py", line 198, in get_price_input    return self._get_token_token_input_price(token0, token1, qty, fee, route)  File "C:\Python39\lib\site-packages\uniswap\uniswap.py", line 296, in _get_token_token_input_price    price = self.quoter.functions.quoteExactInputSingle(  File "C:\Python39\lib\site-packages\web3\contract.py", line 957, in call    return call_contract_function(  File "C:\Python39\lib\site-packages\web3\contract.py", line 1501, in call_contract_function    return_data = web3.eth.call(  File "C:\Python39\lib\site-packages\web3\module.py", line 57, in caller    result = w3.manager.request_blocking(method_str,  File "C:\Python39\lib\site-packages\web3\manager.py", line 198, in request_blocking    return self.formatted_response(response,  File "C:\Python39\lib\site-packages\web3\manager.py", line 170, in formatted_response    apply_error_formatters(error_formatters, response)  File "C:\Python39\lib\site-packages\web3\manager.py", line 70, in apply_error_formatters    formatted_resp = pipe(response, error_formatters)  File "cytoolz/functoolz.pyx", line 667, in cytoolz.functoolz.pipe    return c_pipe(data, funcs)  File "cytoolz/functoolz.pyx", line 642, in cytoolz.functoolz.c_pipe    data = func(data)  File "C:\Python39\lib\site-packages\web3\_utils\method_formatters.py", line 580, in raise_solidity_error_on_revert    raise ContractLogicError('execution reverted')web3.exceptions.ContractLogicError: execution reverted
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