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mempool
Explore the full Bitcoin ecosystem with mempool.space, or self-host your own instance with one-click installation on popular Raspberry Pi fullnode distros including Umbrel, Raspiblitz, Start9, and more!
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
From what I understand, most cryptocurrencies are what you pay for using the specific blockchain. Obviously there are ones that are just currencies. Here's over 300 projects on one blockchain alone, you can see for yourself if the can have any real world value in the future. Solana
If you go to https://mempool.space, you can see that there are blocks that aren't even full, which still have transactions paying $40. You could have gotten your transaction into those same blocks for $0.08. Some people don't seem to care much about transaction fees if they send extremely high value transactions, so they end up massively overpaying. Note that $40 for a $10 million transaction is a 0.0004% fee.