Fail with error 'SafeERC20: low-level call failed' about poly-flashloan-bot HOT 12 CLOSED

@Sahilkhurana I think that USDC/USDT pool is dodo v1 contract and doesn't have the flash loan function, so the tx failed.
You can use WMATIC/USDC pool.

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Yes. All you can do is increasing gas fee.

from poly-flashloan-bot.

Yes, increasing extraGas might help.

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@yuichiroaoki I did try it and it still won't succeed. I noticed that there is a gap of 3-4 blocks in detecting the opportunity and the block # to which the Txn makes its way on MATIC network. I think this duration is enough to lose the arbitrage opportunity due to which the flashloan fails.

from poly-flashloan-bot.

Probably because the dodo pool didn't have enough tokens for you to borrow.
You should check the loan token balance of dodo pool before the execution of flash loan call.

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Hi,

Have successfully deployed the contract. The bot did spot an opportunity but Tx failed with above error. Any idea what might be wrong?

Thanks

Hi @Sahilkhurana

Did you find a profitable arbitrage opportunity? Did you modified anything of the configuration of the flash loan, the gas fee or the token?
I am really interested in this project but I have not been successful yet :(

Thanks for your help 👍

from poly-flashloan-bot.

Thanks @yuichiroaoki I was using ETH/USDC pool which Ideally should have sufficient token balance. Anyways, I updated to a bigger pool which has better token balance. The bot spotted another opportunity but the transaction again failed.
https://polygonscan.com/tx/0x11b74a634b4491bf66ec0a472c3a4e44d15467193b92644542b44c34bba3182f
Did it get front run by someone?

Hi @rinconcsc , I have modified the configurations in the following way

1. Added some more token pools from Dodo for flash loan - specifically USDC/USDT pool
2. Token selection for Arb - I guess its mostly about doing research on coins/token which might be prone to variation and cross checking the exchanges with liquidity on these pools and selecting the right exchange/token combination.
   Having said that, as I have written here, I am yet to have a successful transaction.

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@yuichiroaoki Thank you ! I didn't realize this and seems to be the issue for above transaction. Now sticking to WMATIC/USDC pool and check if I am able to find another opportunity.

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@yuichiroaoki I did change the pool and the bot could spot few opportunities post that. One of the opportunities was as big as 3% (USD 300) but all of 3 Txns failed with 'Fail with error 'Not enough amount to return loan'

Too slow?

https://polygonscan.com/tx/0xaac8ab6f48ec1d4b39790b316269462e951dfd667b18e173a7a1c5d184ee4192
https://polygonscan.com/tx/0xad898c4e5832039834a6890b1e8f3eafe9d8359f3a245d938cadc31231cd84a0
https://polygonscan.com/tx/0xd096ff213ac959e5ff4526ab6b732fbf91f31a25ae694f606a278838e262f161

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extraGas variable in flashloan.ts is the best way to handle this? . I had earlier tried playing with gasLimit which led me run into errors.

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@Sahilkhurana so this means that the bot is still not profitable?

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Yes @rinconcsc .I have been able to spot opportunities but unfortunately all 50+ transactions have failed.

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