What is the standard finders fee rate?

I'm curious, could you please clarify what the standard finders fee rate typically entails in the cryptocurrency and finance industry? I'm particularly interested in understanding the industry norms and benchmarks when it comes to compensating intermediaries or finders who successfully introduce parties to potential business opportunities or transactions. Is there a fixed percentage or does it vary depending on the size and complexity of the deal? I'd appreciate any insights you can provide on this matter.