In Contrast: Method 2: Thank You for Doing Business with us!! Company B - called MailChimp.com - mentions their API on their website, and if you click on the link provided, takes you to the documentation for the entire API - how to use it, all the commands available, sample implementations and scripts - just about anything you could want in order to decide that this is a company you want to work with, including their pricing structure and how to become a client, which the other company didn't offer at all, either. (NOTE: The MailChimp API is elegant, simple and easy to use, and their documentation and video training materials are also top-notch.)
I wrote to them to thank them for the wonderfully helpful site and all the tools and help available and... they wrote back within an hour, thanking me for thanking them, and offering a T-shirt as a gift, if I provided my size. I didn't respond that day, and the next day, the same person sent me a second message reminding me that I hadn't provided my shirt size. REALLY?? Oh Yeah! You can believe I sent that shirt size along with another complimentary note immediately! - and they have already sent me the T-shirt, too!)
Compare that to the example in Company A. Company A, part of a large software business, has a sales line they don't answer and only releases information helpful to their sales efforts IF you are already a customer who has paid extra for the information.