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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.
If that is the case, you must know that Sia has an internal scoring system for choosing the hosts you will use for contracts that penalizes high pricing, what should avoid you forming contracts with abusive hosts. If you want more granular control over the hosts you will pick up for your contract set, or canceling contracts you already have but you dislike, you can use the Decentralizer software, that allows you to order hosts according to their pricing, their location or their performance, and select those you want to avoid (a blacklist) or creating a "bag" of hosts you are ok with (a whitelist).