{"uid":"cap_Kvc2mk_4o9qv5w9kdYxH3","slug":"crypto-fear-greed-index-base-network-bbf17210","name":"Crypto Fear & Greed Index — Base Network","description":"Instant Base wallet health brief. Pay $0.50 USDC via x402. No account.","url":"https://agentkit-x402-buy.vercel.app/api/fear-greed","method":"GET","headers":{},"bodySchema":{"type":"object","$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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"format":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"label":"Fear","seller":"0xEb76f3442EAF192EBdDbc1F7EeBD59CdE5e00D35","network":"eip155:8453","fear_greed":27}},"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_YbZboW_mOrFhaQqZmNmAX","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 crypto Fear & Greed index score and label via a micropayment-gated GET request on the Base network.","exampleAgentPrompt":"What's the current crypto fear and greed index score right now — is the market fearful or greedy?","exampleUseCases":[{"title":"Real-time market sentiment check","prompt":"Pull up the current crypto fear and greed index for me — I want to know if the market is in fear or greed territory right now before I make a move."},{"title":"Automated trading signal trigger","prompt":"Check the current fear and greed index score and let me know the label — I want to use it as a signal for my crypto strategy today."},{"title":"Daily sentiment briefing","prompt":"What's the crypto market feeling like today? Give me the fear and greed index number and whether it's leaning fearful or greedy."}],"resultDescription":"Returns a JSON object with: a numeric fear_greed score (e.g. 27), a human-readable sentiment label (e.g. 'Fear'), the seller wallet address on Base, and the network identifier (eip155:8453). The score typically ranges 0–100 where low values indicate fear and high values indicate greed.","failureModes":["Payment failure: insufficient USDC balance or failed x402 micropayment results in 402 Payment Required","Network error: Base network congestion may delay or fail the payment transaction","Invalid format parameter: unsupported query param value may return malformed response","Service unavailability: Vercel deployment downtime returns 5xx error","Stale data: index value may reflect a recent but not real-time snapshot depending on upstream data provider"],"whenToPreferThis":"Choose this endpoint when you need a quick, no-account-required crypto sentiment index score using a micropayment model on the Base network. It is ideal for AI agents with USDC wallets on Base that need a lightweight, instant sentiment signal without API key registration. Prefer alternatives if you need historical fear/greed data, granular asset-level sentiment, or do not have Base USDC for micropayments.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:38:01.936Z","isFirstParty":false}