UNPREDICTABLE_GAS_LIMIT when calling estimateGas function #3368

Samboy76 · 2022-09-18T08:27:03Z

Samboy76
Sep 18, 2022

When I issue npx ts-node .ts and attempt to call out estimateGas function on sushiswap router as shown in below code snippet it triggers UNPREDICTABLE_GAS_LIMIT error (see below output error log #1).

    const gasLimit = await sushiEthDai.estimateGas.swap(
    			!shouldStartEth ? DAI_TRADE : 0,
    			shouldStartEth ? ETH_TRADE : 0,
    			flashLoanerAddress,
    			ethers.utils.toUtf8Bytes('1')
    		  );

Output Error Log #1
Error: cannot estimate gas; transaction may fail or may require manual gas limit [ See: https://links.ethers.org/v5-errors-UNPREDICTABLE_GAS_LIMIT ] (reason="execution reverted", method="estimateGas", transaction={"from":"0x825c5e7d385F9f07e2312154B0Cf3CDd06396869","to":"0xC3D03e4F041Fd4cD388c549Ee2A29a9E5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000","accessList":null}, error={"reason":"processing response error","code":"SERVER_ERROR","body":"{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}","error":{"code":-32000},"requestBody":"{"method":"eth_estimateGas","params":[{"from":"xxxxx","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}","requestMethod":"POST","url":"https://mainnet.infura.io/v3/xxx"}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.7.1)
at Logger.makeError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:269:28)
at Logger.throwError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:281:20)
at checkError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:78:20)
at JsonRpcProvider. (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:642:20)
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:48:23)
at Object.throw (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:29:53)
at rejected (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:21:65)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
reason: 'execution reverted',
code: 'UNPREDICTABLE_GAS_LIMIT',
method: 'estimateGas',
transaction: {
from: 'xxxxxxxxxxxxxxxxxxxxxxxxxx',
to: '0xC3D03e4F041Fd4cD388c549Ee2A29a9E5075882f',
data: '0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000',
accessList: null
},
error: Error: processing response error (body="{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}", error={"code":-32000}, requestBody="{"method":"eth_estimateGas","params":[{"from":"0x825c5e7d385f9f07e2312154b0cf3cdd06396869","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}", requestMethod="POST", url="https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxx", code=SERVER_ERROR, version=web/5.7.1)
at Logger.makeError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:269:28)
at Logger.throwError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:281:20)
at C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:341:28
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:33:23)
at Object.next (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:14:53)
at fulfilled (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:5:58)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
reason: 'processing response error',
code: 'SERVER_ERROR',
body: '{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}',
error: Error: execution reverted
at getResult (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:142:28)
at processJsonFunc (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:383:22)
at C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:320:42
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:33:23)
at Object.next (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:14:53)
at fulfilled (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:5:58)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
code: -32000,
data: undefined
},
requestBody: '{"method":"eth_estimateGas","params":[{"from":"xxxxxxxxxxxxxxxxxxxxxxxx","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}',
requestMethod: 'POST',
url: 'https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxx'
}
}

I also tried overriding the gas limit when passing it as a parameter into the same function shown below but it returns this time a slightly different error Error: cannot override "gas" (see below output error log #2).

const gasLimit = await sushiEthDai.estimateGas.swap(
 			!shouldStartEth ? DAI_TRADE : 0,
 			shouldStartEth ? ETH_TRADE : 0,
 			flashLoanerAddress,
 			ethers.utils.toUtf8Bytes('1'), {
 				gas: 6721975
 			}
 		  );

Output Error Log #2
Error: cannot estimate gas; transaction may fail or may require manual gas limit [ See: https://links.ethers.org/v5-errors-UNPREDICTABLE_GAS_LIMIT ] (reason="execution reverted", method="estimateGas", transaction={"from":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxx","to":"0xC3D03e4F041Fd4cD388c549Ee2A29a9E5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000","accessList":null}, error={"reason":"processing response error","code":"SERVER_ERROR","body":"{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}","error":{"code":-32000},"requestBody":"{"method":"eth_estimateGas","params":[{"from":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}","requestMethod":"POST","url":"https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.7.1)
at Logger.makeError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:269:28)
at Logger.throwError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:281:20)
at checkError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:78:20)
at JsonRpcProvider. (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:642:20)
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:48:23)
at Object.throw (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:29:53)
at rejected (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\lib\json-rpc-provider.js:21:65)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
reason: 'execution reverted',
code: 'UNPREDICTABLE_GAS_LIMIT',
method: 'estimateGas',
transaction: {
from: 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
to: '0xC3D03e4F041Fd4cD388c549Ee2A29a9E5075882f',
data: '0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000',
accessList: null
},
error: Error: processing response error (body="{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}", error={"code":-32000}, requestBody="{"method":"eth_estimateGas","params":[{"from":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}", requestMethod="POST", url="https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxxxxxx", code=SERVER_ERROR, version=web/5.7.1)
at Logger.makeError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:269:28)
at Logger.throwError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:281:20)
at C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:341:28
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:33:23)
at Object.next (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:14:53)
at fulfilled (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:5:58)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
reason: 'processing response error',
code: 'SERVER_ERROR',
body: '{"jsonrpc":"2.0","id":56,"error":{"code":-32000,"message":"execution reverted"}}',
error: Error: execution reverted
at getResult (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\providers\src.ts\json-rpc-provider.ts:142:28)
at processJsonFunc (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:383:22)
at C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\src.ts\index.ts:320:42
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:33:23)
at Object.next (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:14:53)
at fulfilled (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\web\lib\index.js:5:58)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
code: -32000,
data: undefined
},
requestBody: '{"method":"eth_estimateGas","params":[{"from":"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx","to":"0xc3d03e4f041fd4cd388c549ee2a29a9e5075882f","data":"0x022c0d9f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000a7564f968608ad09236b794836f93a5b76dfd53d000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013100000000000000000000000000000000000000000000000000000000000000"}],"id":56,"jsonrpc":"2.0"}',
requestMethod: 'POST',
url: 'https://mainnet.infura.io/v3/xxxxxxxxxxxxxxxxxxxxxxxxxx'
}
}
Error: cannot override "gas" (operation="overrides", overrides=["gas"], code=UNSUPPORTED_OPERATION, version=contracts/5.7.0)
at Logger.makeError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:269:28)
at Logger.throwError (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\logger\src.ts\index.ts:281:20)
at C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\contracts\src.ts\index.ts:304:16
at step (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\contracts\lib\index.js:48:23)
at Object.next (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\contracts\lib\index.js:29:53)
at fulfilled (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswap-v2\node_modules@ethersproject\contracts\lib\index.js:20:58)
at processTicksAndRejections (node:internal/process/task_queues:96:5) {
reason: 'cannot override "gas"',
code: 'UNSUPPORTED_OPERATION',
operation: 'overrides',
overrides: [ 'gas' ]
}

Not sure if tsnode accepts command line options for setting gas limits or directly within tsconfig.json. This last case, I have consulted the tsconfig docs but it says nothing or no mention about gas limits. So I´m stuck here.

Any help would be greatly appreciated.

Thank you,
Samuel

zemse · 2022-09-23T07:45:52Z

zemse
Sep 23, 2022
Collaborator

The contract you are interacting with 0xC3D03e4F041Fd4cD388c549Ee2A29a9E5075882f is a Pair contract and it cannot be safely interacted with an EOA. You have to use a periphery contract like SushiSwapRouter, you can find that in the docs here.

I understand the bad dx you faced since the contract didn't provide a revert reason. I understand it can be frustrating but what can be done, we can only try to improve the situation. Just to mention on the other issues you faced:

Error: cannot override "gas"

For overriding the gas limit you have to use gasLimit. You can see list of overrides in docs.

Not sure if tsnode accepts command line options for setting gas limits or directly within tsconfig.json.

ts-node or typescript just concerns with type checking, it does not want to do any run-time changes.

6 replies

zemse Sep 25, 2022
Collaborator

The swap function is not safe to be called from EOA. You should be calling swapExactTokensForTokens or similar method on the router.

Samboy76 Sep 25, 2022
Author

Ok thank you.

When I call following getPair under uniswapFactory contract I created via ethers.Contract it doesn´t return any pair address.

const UniswapV2Factory = require("./build/contracts/IUniswapV2Factory.json");

uniswapFactory = new ethers.Contract(
		'0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f', // uniswap v2 factory address in Etherscan mainnet
		UniswapV2Factory.abi, wallet
	);

	const pairAddress = await uniswapFactory.getPair(wethAddress, otherAddress);
  	const pair = new Contract(pairAddress, UniswapV2Pair.abi, wallet);
	console.log("yeah2!");

Strange thing is if I removed await keywork it returns Promise { }.

However, if I run await uniswapFactory.getPair(wethAddress, otherAddress); directly under Truffle console it resolves the pair address correctly.

Any suggestions would be greatly appreciated as it´s been bugging me also for a very long time.

Thank you

zemse Oct 2, 2022
Collaborator

it doesn´t return any pair address.

It should return the pair address, do you get any error?

const pairAddress = await uniswapFactory.getPair(wethAddress, otherAddress);
console.log("pairAddress", pairAddress); // can you log here and see?
const pair = new Contract(pairAddress, UniswapV2Pair.abi, wallet);
console.log("yeah2!");

Samboy76 Oct 2, 2022
Author

Yes it resolves when I migrated over from Truffle to Hardhat run-time.

Samboy76 Oct 2, 2022
Author

I have another issue.

When I execute the following function in UniswapV2Library.getReserves(address factory, address tokenA, address tokenB) it returns Error: Transaction reverted: function returned an unexpected amount of data
Take note factory is Sushiswap factory address, token0 and token1 are 1INCH and WETH token addresses respectively on mainnet.

(reserve0, reserve1,) = IUniswapV2Pair(pairForSushiswap(factory, token0, token1)).getReserves();

function pairForSushiswap(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint160(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'34a26ac00aeedff252c746538fd4d97e26d9bc7e1d5a32b31c6e3cdea7c6147d' // init code hash
            )))));
    }

_Error: Transaction reverted: function returned an unexpected amount of data
at FlashloanArbitrage.getReserves (contracts/UniswapV2Library.sol:74)
at FlashloanArbitrage.getAmountsIn (contracts/UniswapV2Library.sol:124)
at FlashloanArbitrage.uniswapV2Call (contracts/FlashloanArbitrage.sol:110)
at . (0x86f518368e0d49d5916e2bd9eb162e9952b7b04d)
at FlashloanArbitrage.startArbitrage (contracts/FlashloanArbitrage.sol:50)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at EthModule._estimateGasAction (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\provider\modules\eth.ts:429:7)
at HardhatNetworkProvider._sendWithLogging (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\provider\provider.ts:139:22)
at HardhatNetworkProvider.request (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\provider\provider.ts:116:18)
at JsonRpcHandler._handleRequest (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:188:20)
at JsonRpcHandler.handleSingleRequest (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:167:17)
at Server.JsonRpcHandler.handleHttp (C:\Samuel\Blockchain\Flashloan-arbitrage-bot-uniswapV2_hardhat\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:52:21)

Any clues please?

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