"Public addresses" have vague meaning, do you mean Address (sometimes called Bitcoin Address) or Public Key?

Anyway, if you plan to use BitPay Insight API, you should check their documentation at https://github.com/bitpay/insight-api/tree/dbfafe8911ebf740df114f6609fc58cf8235f2c6#api-http-endpoints (this is the only documentation that could i find)