I already have a Capital One Quicksilver credit card, and now I’m looking to add another card for everyday spending. Can anyone recommend a good no-annual-fee card with solid perks for daily use?

I am a developer and am going to develop a Bitcoin game website for my company, so what are the recommended APIs to connect the Bitcoin game website to the Bitcoin network, and what step-by-step instructions can help create unique Bitcoin addresses for players? The game will automatically update their game balance when they send Bitcoin.