POST a JSON body containing events to /api/v1/x402/profit/calculate. The first response is HTTP 402 with x402 v2 requirements. A compatible buyer signs the authorization and retries. The paid response gives per-currency P&L, cash flow, attribution breakdowns, coverage, exclusions, warnings, formulas, and engine version. The synthetic sample at /sample-report is reproducible and never presented as customer activity.
This material describes operational analytics, not tax, legal, financial, investment, or statutory accounting advice.