You can check private residential property transactions via URA's link here: https://www.ura.gov.sg/realEstateIIWeb/transaction/search.action?utm_source=Public-PropertyMarketData&utm_medium=website&utm_campaign=Home-quicklinks&utm_content=Home-quicklinks
You can check HDB property transactions via HDB's link here: https://services2.hdb.gov.sg/webapp/BB33RTIS/BB33PReslTrans.jsp?fbclid=IwAR3gGOuYjgjyhCm6kgkHcjSh2OdKxELcs-kmTssf91OyWwIfqEE_jzkpehg
Hope this answers your question.
You could refer to the publicly published information and data from URA, though the data may not be the most updated.
To get the most updated transactions, you can contact a professional estate agent whom had these services subscribed. We will be able to provide you with the most updated information.
I am experienced and well-versed in both HDB and private transactions. I will be able to assist you in your property plans.
Should you need require further assistance in matters relating to property, please contact me at my mobile 9748 6305. I will be happy to assess and share with you the possibilities for you in the current market.