What happens when AI agents pay each other? Most transactions today run on cards, but card rails are too slow and too expensive for what an agent needs. Arthur Bedel explains why blockchain is becoming the key rail for agent-to-agent payments: speed, smart contracts that execute as soon as a condition is met, and low transaction costs. Agents will not transact like humans. They will buy API access and data in what Arthur calls nano transactions, and the infrastructure behind payments will have to be rebuilt, for agents and for humans alike.
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