Jan Čurn examines x402 as an early attempt to let AI agents pay for online services without a conventional account or checkout flow. He argues that the idea is promising but not yet cleanly compatible with agent protocols such as MCP, because both payment and authorization failures compete for HTTP status-code semantics.
The harder problems appear when a service cannot know the final price in advanceVariable pricing calculates the final charge from actual usage, conditions, or work performed instead of fixing the complete price before service begins.. Starting work before a blockchain payment settles can expose the provider to double spending, while charging a maximum amount and later refunding the difference creates two transactions, extra fees and a new trust requirement for the customer.
Čurn describes batch settlement as a practical compromiseBatch settlement combines multiple payment obligations into fewer final settlement transactions to reduce fees, delay, and ledger activity.. An escrow-backed system can issue off-chain vouchers for many small purchasesAn off-chain voucher is a signed or otherwise verifiable claim representing a small payment obligation without immediately recording the final transfer on a blockchain. and settle them together later, reducing chain activity while keeping a usable payment trail. He concludes that agent commerce needs better support for metered workMetered billing charges for measured consumption such as tokens, compute time, data, calls, or messages rather than one fixed upfront amount., delayed settlement and dispute handling before it becomes a routine infrastructure layer. Product and service promotion are omitted.
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