What does ACH cost?

As a keen observer in the world of finance and cryptocurrency, I'm always on the lookout for efficient and cost-effective payment methods. In my research, I've stumbled upon ACH, which seems to be a popular choice for many. However, I'm curious about its financial implications. So, here's my question: What does ACH cost? Are there any upfront fees or recurring charges associated with using ACH for transactions? I understand it's a convenient way to move funds, but I'd like to ensure it fits my budget. Any insights you can provide would be greatly appreciated.