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Endpoint - https://ropsten.api.0x.org/sra/v4/order doesn't work anymore (404 error).
Faced with this problem only on ropsten.
Mainnet works fine.
Did 0x change ropsten endpoints?
The /sra/v4 endpoints were renamed to /orderbook/v1 some time ago, you can refer to https://0x.org/docs/api#post-orderbookv1order for updated docs
Required, but never shown