Blockchain technology is emerging as a pivotal enabler for the development of open and decentralized AI agent marketplaces. Unlike centralized platforms such as AWS and Google, blockchain provides a programmable, permissionless infrastructure that allows AI agents to autonomously interact, trade, and collaborate. This infrastructure enables AI agents to self-custody assets, execute smart contracts, and conduct transparent transactions. The use of blockchain tools like smart contracts, stablecoins, and smart accounts is crucial for establishing secure and scalable agent-to-agent commerce. These tools facilitate the growth of an agent economy where AI agents can rent services, earn income, and operate across various sectors without human intervention, marking a significant shift towards decentralized digital ecosystems.