provider.call(tx) specifies both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) (EIP-1559)

[ollie041114]

Describe the bug
When I try to use provider.call(tx, tx.blockNumber) to get information about a transaction, I always get an error ""both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified".

Reproduction steps

const provider = new ethers.providers.JsonRpcProvider(process.env.polygonRPC);
await this.provider.call(a, a.blockNumber, {
"type":"0x2",
 "maxFeePerGas":"0x59682f1a",
"maxPriorityFeePerGas":"0x59682f00"
});

Environment:
"ethers": "^5.6.0"
"node": "^17.5.0"
testnet: Polygon Mumbai

Search Terms

EIP-1559, provider, call

[zemse]

Can you provide the value that the variable a take?

Also pls see that the signature of provider.call is:

call(
  transaction: Deferrable<TransactionRequest>, 
  blockTag?: BlockTag | Promise<BlockTag>
): Promise<string>;

Hence the third arg that is being passed would be a no-op.

[binggao]

Got the same issue but it's from calling Quickswap router contract for swapping

        const tx = await quickswapRouter.swapExactTokensForTokens(
          amount[0],
          amtOut,
          p,
          wallet.address,
          Date.now() +  + 1000 * 60 * 10,
          {
            maxPriorityFeePerGas: ethers.utils.parseUnits("50", "gwei"),
            maxFeePerGas: ethers.utils.parseUnits("50", "gwei"),
            gasLimit: 2000000,
          }
        );

It failed with a "CALL EXCEPTION" error then I used somebody's code to extract a little details of the error

      const provider = new ethers.providers.JsonRpcProvider('https://polygon-mainnet.g.alchemy.com/v2/...');
      const a = await provider.getTransaction('0x9e818fd7b09fa447d2ecca30b2632c966b93cf74639b4a5af05d62b73b5b9a0b');
      try {
      let code = await provider.call(a, a.blockNumber)
      } catch (err) {
      const code = err.data.replace('Reverted ','');
      console.log({err});
      let reason = ethers.utils.toUtf8String('0x' + code.substr(138));
      console.log('revert reason:', reason);
      }

I got this

      reason: 'processing response error',
      code: 'SERVER_ERROR',
      body: '{"jsonrpc":"2.0","id":48,"error":{"code":-32000,"message":"both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified"}}',

Can you please help?

[zemse]

Got the same issue but it's from calling Quickswap router contract for swapping

It seems your transaction is failing due to the revert UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT. And one would get this revert when price moves down, such that you would get less than amtOut that you specified in the argument. (This is specific to UniswapV2 protocol and out of scope of ethers).

It failed with a "CALL EXCEPTION" error then I used somebody's code to extract a little details of the error

The code snippet in the OP would not work because the provider.getTransaction would populate effective gasPrice and maxFeePerGas. In order for this to work, you can try passing just enough props:

let code = await provider.call({to: a.to, data: a.data, value: a.value}, a.blockNumber)

[ShivaShanmuganathan]

This worked for me. Thanks!

[dudu631]

Got the same issue but it's from calling Quickswap router contract for swapping

        const tx = await quickswapRouter.swapExactTokensForTokens(
          amount[0],
          amtOut,
          p,
          wallet.address,
          Date.now() +  + 1000 * 60 * 10,
          {
            maxPriorityFeePerGas: ethers.utils.parseUnits("50", "gwei"),
            maxFeePerGas: ethers.utils.parseUnits("50", "gwei"),
            gasLimit: 2000000,
          }
        );

I'm having the same problem as stated by you, I'm trying to call an Contract interface, passing override arguments for EIP-1559.

contract.myMethod(arg1, {
                gasLimit,
                maxFeePerGas,
                maxPriorityFeePerGas,
              })

This gives me the error: both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified, even though I'm not overriding gasPrice.

[ricmoo]

I think there may be another issue here. I have been able to submit transactions to Mumbai with the above overrides.

I'm moving this to discussions. If you can provide a concise example, including all values, which can be cut and paste into a script, please do. Include all parameters, addresses, etc.

[iboxgithub]

indeed on Alchemy, provider.call(tx, tx.blockNumber) always returns "both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified" but it seems like it's because provider.call sends them both arguments as you can see on the screenshot below

[iboxgithub]

ho actually @zemse's answer got it right: the root cause is that getTransaction populates gasPrice and maxFeePerGas, and eth_call on Alchemy returns the above error. By sending the exact amount of arguments (and not the full object), it now works