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I want to know if correlations are breaking down, which risk regime we're in, and whether there are any notable divergences — give me the full cross.regime briefing in JSON format.","exampleUseCases":null,"resultDescription":"Returns a structured JSON (or markdown) briefing containing regime classification labels, correlation breakdown signals across assets, risk-on/risk-off regime context, divergence detection between asset classes, confidence scores, and a timestamped narrative summary of current cross-asset dynamics.","failureModes":["Missing required 'briefing' query param returns 400 bad request","Invalid date format (not YYYY-MM-DD) returns validation error","Historical date beyond tier access range returns 403 or access error","Invalid briefing ID enum value returns 400","Payment not completed (x402) returns 402 Payment Required","Server unavailable or data stale returns 503 or error payload"],"whenToPreferThis":"Choose this endpoint when you need a holistic, multi-asset regime label rather than Bitcoin-specific or single-asset metrics. Prefer this over btc.* briefings when the user cares about how assets are moving relative to each other, whether correlations are breaking, or what broad macro risk regime the market is in. Best suited for portfolio risk framing, macro regime-aware strategy, or detecting stress periods when cross-asset relationships shift.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:36:35.856Z","isFirstParty":false,"canonicalSlug":"prereason-cross-asset-regime-classification-api-62ec9712"}