the flat per-call price in USD — the paidTool(name, desc, PRICE, …) argument.
the same, raw micro-USD (the cost model's native unit; 1 USD = 1_000_000 µ$).
true ⇒ ALSO has usage-metered components a fixed per-call price can't capture — the honest pointer to MPP session.
An x402
paidToolprice derived from a route's declaredx-suluk-cost(C026/C035).