AI agents will now pay only for the compute they use, not fixed fees

AI agents will now pay only for the compute they actually use, not fixed fees set in advance. This shift comes via the 'Upto' mechanism introduced by Coinbase for the x402 protocol, which replaces rigid pricing with dynamic, usage-based billing tied to metrics like token count or processing time. Previously, the protocol supported only exact, fixed-price payments—ideal for predictable API calls but inadequate for AI tasks where resource demands fluctuate. That bottleneck blocked entire categories of services, including large language model inference and complex data queries, where cost depends on runtime variables. Under the new model, sellers define a maximum price, buyers set a spending cap, and once the task completes, the system charges precisely for the resources consumed. The protocol runs on an Ethereum Virtual Machine (EVM) framework, supports all ERC20 tokens, and enables gasless transactions through the CDP Facilitator. Originally developed by Coinbase, the x402 protocol has been transferred to the nonprofit Linux Foundation, with Google, Microsoft, and Amazon Web Services now holding stakes through the x402 Foundation. The change clears a critical path for scalable agentic commerce, where autonomous AI systems must execute high-volume, variable-cost transactions in real time.