{"uid":"cap_GaPuDRiB_AghADvGigQQf","slug":"carbon-cashmere-beta-to-btc-signal-api-eth-89479f3c","name":"Carbon & Cashmere Beta-to-BTC Signal API – ETH","description":"Professional crypto market intelligence. Real-time prices, signals, and market scoring.","url":"https://api.carbon-cashmere.de/v1/beta-to-btc/ETH","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"beta":1.12,"coin":"ETH","_meta":{"disclaimer":"Informational research data only — not investment advice."},"regime":"amplifier","r_squared":0.78,"stability":"stable","rolling_30d":{"std":0.08,"mean":1.11,"current_beta":1.15},"lookback_days":90,"alpha_daily_pct":-0.02}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_oiui5ZhJl0BX36KiIdLIH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the beta coefficient of ETH relative to BTC, including market regime, stability classification, rolling 30-day statistics, R-squared fit, and daily alpha percentage.","exampleAgentPrompt":"What's ETH's current beta to BTC — is it in an amplifier regime, how stable is it, and what's the daily alpha looking like over the last 90 days?","exampleUseCases":[{"title":"ETH portfolio hedge sizing","prompt":"I'm running a BTC-heavy portfolio and want to hedge with ETH positions — can you pull the current beta coefficient and stability classification so I can size the hedge correctly?"},{"title":"Regime shift detection for ETH","prompt":"Has ETH flipped from an amplifier to a dampener regime recently? Show me the current regime label, R-squared fit, and how the 30-day rolling beta has been trending."},{"title":"Daily alpha monitoring for ETH","prompt":"I track ETH versus BTC every morning — what's the daily alpha percentage right now, is the beta stable or unstable, and where does current beta sit relative to the 30-day mean and standard deviation?"}],"resultDescription":"A JSON object containing ETH's beta coefficient relative to BTC (e.g. 1.12), the market regime label (e.g. 'amplifier'), stability classification (e.g. 'stable'), R-squared goodness-of-fit, rolling 30-day statistics (mean, std dev, current beta), the lookback period in days, and the daily alpha percentage.","failureModes":["Invalid or unsupported coin symbol returns an error","Service unavailable if upstream market data feed is down","Payment failure if USDC balance is insufficient for the $0.01 per-call fee","Stale data if market data pipeline is delayed","Malformed request returns 400-level error"],"whenToPreferThis":"Use this endpoint when you need quantitative beta and regime analytics for ETH relative to BTC — specifically when you want rolling statistics, market regime classification (amplifier/dampener), stability labels, and daily alpha. Prefer this over generic price endpoints when the use case is systematic risk measurement, portfolio hedging analysis, or momentum/mean-reversion regime detection for ETH specifically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:55:49.254Z","isFirstParty":false}