When you call an endpoint to get transactions by address in BCH you can use the legacy address or the new format, if you use the legacy you will get the transactions as legacy however if you use the new format you will get the transactions in the new format.

https://docs.cryptoapis.io/rest-apis/blockchain-as-a-service-apis/bch/index#bch-address-transactions-endpoint

The same is valid for Get Unconfirmed Transactions By Address as well:

https://docs.cryptoapis.io/rest-apis/blockchain-as-a-service-apis/bch/index#bch-address-unconfirmed-transactions-endpoint