Finder’s Fee

I need some help: At the beginning of 2025, my friend mentioned to me that he had a friend who was attempting to sell her company off-market. He passed along her number and I reached out. He said he "would like a piece of the deal if it closes." I submitted an LOI in February, which was initially rejected... the seller said she she wasn't ready to sell. I kept in touch with the seller throughout the year and in November she is now ready. I've submitted an LOI and expect the deal to close in Feb. 2026. I reached back out to the friend to invite him to invest in a small percentage of ownership and he is now requesting a standard finders fee that he would roll into equity. I don't recall discussing a finders fee, only that he "would like a piece of the deal". I'm curious to know if others would also expect to pay a finders fee to a friend who passed along a tip on a company ready to sell.