FluxA AgentCard: I Gave My AI Agent a Virtual Credit Card — Here's What Happened

I've been building with AI agents for a while now. From basic chatbots to autonomous agents that can research, write, submit, and iterate on their own. But there's always been the same unsolved problem: how does the agent pay for something without me sitting at the keyboard to approve it? Last month I tried FluxA. specifically: I gave my agent an AgentCard - a virtual card the agent can use to transact autonomously, with spending limits I define upfront. This is a write-up from real usage, not just reading the docs.