{"uid":"cap_UafSXvAvVHc2CY_zBPfLI","slug":"speraxos-defi-fear-greed-index-api-f4ef0a3f","name":"SperaxOS DeFi Fear & Greed Index API","description":"AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.","url":"https://chat.sperax.io/api/x402/tools/defi-analytics/getFearGreedIndex?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":[],"properties":{},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"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_HkQ5iM3N81y3qeqjS5f-S","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0xD74f5255D557944cf7Dd0E45FF521520002D5748","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current crypto Fear & Greed Index score and sentiment label for DeFi market intelligence","exampleAgentPrompt":"What is the current crypto Fear and Greed Index? I want to know if DeFi markets are in fear or greed territory right now.","exampleUseCases":[{"title":"Pre-trade market sentiment check","prompt":"Before I make any DeFi trades today, can you pull the current Fear and Greed Index so I know whether the market is in extreme fear or greed?"},{"title":"Daily DeFi market briefing","prompt":"Give me a quick market mood update — what's the Fear and Greed Index sitting at right now for crypto?"},{"title":"Automated sentiment-based trading signal","prompt":"Check the current DeFi Fear and Greed Index and tell me the score and label so I can decide whether to buy the dip or hold off."}],"resultDescription":"Returns the current Fear & Greed Index value (typically 0–100) and a corresponding sentiment classification such as 'Extreme Fear', 'Fear', 'Neutral', 'Greed', or 'Extreme Greed', providing a snapshot of current DeFi/crypto market sentiment.","failureModes":["Payment failure if USDC balance is insufficient or x402 payment not completed","HTTP 402 returned if payment is not attached to the request","Empty or malformed response body if the upstream data source is unavailable","Rate limiting or timeout if the SperaxOS backend is overloaded","Stale data if the index has not been recently updated by the underlying data provider"],"whenToPreferThis":"Choose this endpoint when you need a quick, real-time crypto market sentiment pulse without setting up an API key — especially when operating in a pay-per-use agent context using x402/USDC on Base. Ideal for DeFi-native workflows where wallet-based micropayments are already in use and you want AI-augmented market intelligence without a subscription.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:54:45.980Z","isFirstParty":false,"canonicalSlug":"speraxos-defi-fear-greed-index-api-f4ef0a3f"}