Is there any regulation for p2p lending and protection for investors?

In short they are regulated by MAS, you can check each P2P company website for more information. Here's an example of Funding Societies R&R: https://fundingsocieties.com/risk-disclosure

Your funds are stored in Escrow accounts (not related to the p2p company), so in the event of the P2P company goes bankrupt, your $ is still there. eg: https://blog.fundingsocieties.com/investments/what-is-an-escrow/

As it is also consder as high risk investment, do read about some questions and answer here on the loan default situations: https://seedly.sg/questions/what-happens-when-a-p2p-borrower-defaults-payment-goes-bankrupt-asking-from-a-p2p-lending-investor-pov

More Q&A here: https://help.fundingsocieties.com/?utm_source=mainsitesg&utm_medium=footer

Seedly sharing about p2p: https://blog.seedly.sg/p2p-comparison/

Existing independent Customer review of each company: https://seedly.sg/reviews/p2p-lending

https://blog.seedly.sg/p2p-lending-review-takeaways-after-6-months/

and the latest review (still consolidating) here: https://seedly.sg/questions/share-your-p2p-lending-platform-funding-societies-coassets-moolahsense-capital-match-minterest-seedin-returns-and-performance-so-far