Failing to fill 0x quote

Question

I'm trying to fill a quote that I get from the 0x API:

const qs = createQueryString({
   sellToken: 'TUSD',
   buyToken: 'WETH',
   sellAmount: BigInt(882693 * 10 ** 18)
}); 

..but the transaction reverts, even after successfully getting the quote (taker has the sell balance, allowance was granted, value of the fee is 0).

URL: https://api.0x.org/swap/v1/quote?sellToken=TUSD&buyToken=WETH&sellAmount=882693000000000051118080&slippagePercentage=0.8

If I modify sellAmount with:

1. BigInt(882693 * 10 ** 12):the swap runs but with less traded amount (obviously since TUSD is 18 decimals).
2. 882693 * 10 ** 18: doesn't even get the quote (throws an error on sellAmount).
3. 882693: same problem as 1.

If I add includedSources: 'Uniswap_V2', for example, to the quote, the swap runs but with less traded amount while having just one order in the quote:

But when running the original quote, I get two orders instead so I think here is where it fails.

How do I fill this quote from the API that has two orders ? I looked through the API docs but couldn't find an answer.

Thanks for the help!

Answer 1

Solution:

My contract is a hardhat fork with a pinned block to an old state from mainnet, and the 0x API makes offchain requests to the current state, so the liquidity that appears on the quote is not the same as that the contract aims to fill.

This could be and most likely is the reason why it's failing since when I doubled the gas on the call, and check -with gasleft()- the amount of gas taken on the execution, it was roughly 90k -after failure- when I had passed over 1M in gas to the call.