Support Gorli Testnet

[sthornton13]

Expected Behavior

Support Gorli Testnet like Ropsten with a new Gorli endpoint https://ropsten.api.0x.org/ => https://goerli.api.0x.org/

Current Behavior

Currently only the Ropsten testnet is supported or you have to fork mainnet with ganache or hardhat.

Context

Ropsten is/being deprecated. Gorli is currently the only listed testnet on Ethereum that is to be expecting long term support. https://ethereum.org/en/developers/docs/networks/ It would be beneficial to improve 0x to support Gorli as a testnet option. Services like BitQuery and others are using it for their testnet. If 0x supported Gorli it would help make 0x compatible with other Ethereum blockchain services.

[sey]

As mentioned in Support for Goerli and Mumbai testnets, they now support Goerli.
However the Swap API does not seem to work and I couldn't find specific details on what is really supported for Goerli.

For example this endpoint gives a response https://ropsten.api.0x.org/swap/v1/quote?buyToken=DAI&sellToken=WETH&sellAmount=100000000000000000 but not this one https://goerli.api.0x.org/swap/v1/quote?buyToken=DAI&sellToken=WETH&sellAmount=100000000000000000 which gives the following response:

{
    "code": 100,
    "reason": "Validation Failed",
    "validationErrors": [
        {
            "field": "buyToken",
            "code": 1000,
            "reason": "buyToken and sellToken must be different"
        },
        {
            "field": "sellToken",
            "code": 1000,
            "reason": "buyToken and sellToken must be different"
        }
    ]
}

[soccerarenadev]

Same for Mumbai.

They have a rather scarce support for the community, no one replies about problems or bugs on Discord, github o stackexchange.