Sean-Claude Van Damme's General Store • Oak City

Price written in dollars where atomic units are required — x402 defect class amount-not-atomic

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Asserts: accepts amounts are integer atomic units (USDC has six decimals).

What a buyer loses when it is present: A decimal point usually means the price is off by a factor of a million, in one direction or the other.

Detectable: by an unpaid probe — a GET nobody paid for can see it.

Falsified by: The amount parsing as an integer string.

How an operator clears it: Write amount as an integer string of atomic units — for USDC, dollars times ten to the sixth — and derive it from one constant so the menu and the challenge cannot disagree.

Our signal: amount-not-atomic.

Vocabulary v9, CC BY 4.0. Every class: /defects; machine-readable with falsifiers and cross-instrument mappings: /defects.json. A class describes a property of one endpoint at one moment and never accumulates into a judgment on an operator.

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