{"uid":"cap_mWPzhHm99GKI-s2AU1FeV","slug":"crypto-fear-greed-sentiment-index-9a504450","name":"Crypto Fear & Greed Sentiment Index","description":"Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.","url":"https://kr-x402-mvp.kgy5612.workers.dev/v1/crypto/sentiment?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"days":{"type":"integer","maximum":30,"minimum":0,"examples":[7],"description":"History points to return (default 7, 0 = none)"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"zone":"fear","label":"Fear","trend":"falling","value":34,"avg_7d":39.4,"signal":"NEUTRAL","source":"https://alternative.me/crypto/fear-and-greed-index/","avg_30d":47.1,"history":[{"date":"2026-10-30","label":"Fear","value":34}],"max_30d":66,"min_30d":28,"reasons":["34 Fear, -12 vs 7d ago","below 30d avg 47.1"],"previous":{"label":"Fear","value":38},"change_1d":-4,"change_7d":-12,"change_30d":-20,"updated_at":"2026-10-30T00:00:00Z","streak_days":5}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xODBFsIcEDR0t1-as3Tgv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current and historical crypto Fear & Greed Index value with trend, zone classification, and statistical summaries over up to 30 days.","exampleAgentPrompt":"What's the current crypto Fear & Greed Index, and show me how sentiment has trended over the past 7 days — is the market in fear or greed right now?","exampleUseCases":[{"title":"Sentiment-gated trade decision","prompt":"Before I execute this ETH buy, check the Fear & Greed Index — if we're in extreme fear (below 25), go ahead; otherwise hold off. Show me today's value and the 7-day trend."},{"title":"Daily market briefing for trading bot","prompt":"Pull today's crypto Fear & Greed score along with the 30-day average and tell me whether sentiment is trending up or down from yesterday."},{"title":"Monthly sentiment retrospective","prompt":"Give me the full 30-day crypto Fear & Greed history so I can see how sentiment moved over the past month — I want the min, max, and average for the period."}],"resultDescription":"Returns a JSON object with the current Fear & Greed numeric value (0–100), zone label (e.g. 'Fear'), trend direction, 1-day/7-day/30-day changes, 7-day and 30-day averages, min/max over 30 days, a trading signal string, streak days in current zone, an array of historical daily readings, human-readable reasons, the previous day's reading, and an updated_at timestamp. Source is attributed to alternative.me.","failureModes":["Upstream alternative.me API unavailable — stale or missing data returned","days parameter out of range (>30 or <0) — validation error","x402 payment not completed — 402 Payment Required response before data is served","Network timeout on workers.dev edge — transient 5xx error"],"whenToPreferThis":"Choose this endpoint when your agent needs crypto market sentiment context without managing API keys — ideal for trading bots, DeFi agents, or portfolio tools that want a pay-per-call Fear & Greed signal via x402 micropayments on Base. Prefer it over free alternatives when you need historical trend data (7/30-day stats, streaks, min/max) bundled in a single call and when operating in a keyless, agent-native payment environment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:42:12.599Z","isFirstParty":false,"canonicalSlug":"crypto-fear-greed-sentiment-index-9a504450"}