{"uid":"cap_BGVyB1ghsMRFw1ihzAGbD","slug":"crypto-fear-greed-index-api-876d5f8c","name":"Crypto Fear & Greed Index API","description":"Crypto Fear & Greed Index (alternative.me): current value 0-100, classification, history of last N days. No params. Use when an agent needs a market-sentiment gauge.","url":"https://x402-data-api.sigrunner.workers.dev/crypto/fear-greed?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":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["value","classification","history"],"properties":{"value":{"type":"integer"},"history":{"type":"array","items":{"type":"object","required":["value","classification","date"],"properties":{"date":{"type":"string"},"value":{"type":"integer"},"classification":{"type":"string"}}}},"classification":{"type":"string"}}}}}}},"responseSchema":{"type":"json","example":{"value":59,"history":[{"date":"2026-10-19","value":59,"classification":"Greed"}],"classification":"Greed"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_troYplNKAaeF2Janrry_v","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current Crypto Fear & Greed Index value (0–100), its classification, and historical daily values for the last N days.","exampleAgentPrompt":"What's the current crypto fear and greed index, and can you also show me how it's trended over the last 14 days?","exampleUseCases":[{"title":"Pre-trade sentiment check for crypto bot","prompt":"Before executing this crypto trade, check the current fear and greed index — if we're deep in fear territory I want to reconsider my position size."},{"title":"Daily market mood briefing","prompt":"Give me today's crypto fear and greed index value and classification so I can include it in my morning market summary."},{"title":"30-day sentiment trend analysis","prompt":"Pull the fear and greed index for the last 30 days so I can see how market sentiment has shifted over the past month."}],"resultDescription":"A JSON object containing: the current index value (integer 0–100), a classification string (e.g. 'Fear', 'Greed', 'Extreme Fear', 'Extreme Greed', 'Neutral'), and a history array of daily objects each with a date string, integer value, and classification label for the requested number of past days.","failureModes":["Upstream alternative.me API unavailable — returns error or stale data","Invalid 'days' query parameter type causes schema validation error","Payment not completed via x402 protocol — request rejected with 402 status","Rate limits or quota exceeded on the worker side"],"whenToPreferThis":"Choose this endpoint when you need a fast, single-call market-sentiment gauge for cryptocurrency markets, especially in agentic trading workflows, daily briefings, or risk-gating logic. It is ideal when you want both the current value and recent history in one response without managing alternative.me directly. At $0.002/call it is cost-effective for high-frequency polling or real-time sentiment monitoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T07:06:29.743Z","isFirstParty":false,"canonicalSlug":"crypto-fear-greed-index-api-876d5f8c"}