As of March 4, 2026, the crypto market remains in a deep adjustment phase, but innovation in technology and application layers continues unabated. Especially in the AI Agent field, a fundamental transformation driven by underlying infrastructure is underway. In the past week, Solana, BNB Chain (BSC), and Base, three major mainstream Layer 1 and Layer 2 networks, have almost simultaneously released key infrastructure upgrades. This is not isolated marketing events but a sign that AI Agents are officially moving from "proof of concept" to a large-scale on-chain native explosion. This infrastructure race is profoundly changing the structure of on-chain ecosystem participants, the flow of value, and application forms by building standardized tracks for identity, payments, execution, and collaboration. Background and Timeline of the AI Agent Infrastructure Explosion