We're offering the API for free, and have the playground available for anyone to use as well. As for self-hosting, we haven't quite decided on the business mode

We're offering the API for free, and have the playground available for anyone to use as well. As for self-hosting, we haven't quite decided on the business model, and were trying to gauge interest. For now, we're happy to offer free self-hosting for the first few people, but may charge eventually. Our intention wasn't to obfuscate this, so thanks for the feedback. We'll try making that more apparent.