{"uid":"cap_k-GEoHbAQPnPaojCjxUTT","slug":"greeneris-data-crypto-fear-greed-index-4d3a4af4","name":"greeneris-data Crypto Fear & Greed Index","description":"**European business verification for AI agents** - check that a company exists (official French SIREN registry), screen insolvency records (BODACC), validate EU VAT numbers before invoicing (VIES), verify SIRET/IBAN/LEI, addresses and email deliverability, find EU public tenders. Plus 70+ supporting pay-per-call data endpoints (FX, macro, energy, weather, crypto) at commodity prices.\n\n**No account, no API key**: every paid endpoint answers HTTP 402 with a machine-readable quote; pay in USDC on Base via the x402 protocol and retry. AI agents can also use the MCP server (`/mcp`, streamable HTTP, x402-paid tools) or read `/llms.txt` for the full plain-text catalog. Official data sources (INSEE, European Commission, DILA, GLEIF, ECB); no personal data served; buyers are never charged for empty or failed answers.","url":"https://data.greeneris.io/v1/crypto/fng","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":{"days":{"type":"integer","default":1,"maximum":90,"minimum":1,"description":"Number of daily data points to return"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"value":28,"source":"Crypto Fear & Greed Index by alternative.me","delta_7d":-5,"timestamp":1783900800,"classification":"Fear"}},"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_wBYFCRGlcVSC0wnyM0EuO","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 value with classification and 7-day delta, optionally for up to 90 daily data points","exampleAgentPrompt":"What's the current crypto fear and greed index? Show me today's value and the last 7 days of data so I can see how sentiment has trended.","exampleUseCases":null,"resultDescription":"Returns a JSON object with the Fear & Greed index value (0-100), classification label (e.g. 'Fear', 'Greed', 'Extreme Fear'), 7-day delta, Unix timestamp, and source attribution from alternative.me. When multiple days are requested, returns an array of daily data points.","failureModes":["HTTP 402 returned with machine-readable payment quote if USDC payment via x402 has not been made","Invalid days parameter (outside 1-90 range) returns validation error","Upstream alternative.me data unavailable causes service failure","No charge occurs for empty or failed responses"],"whenToPreferThis":"Use this endpoint when you need a pay-per-call, no-account sentiment gauge for the crypto market based on the widely-recognized alternative.me Fear & Greed Index. Prefer it over self-hosted alternatives when operating in an x402-compatible agent environment and you want a single commodity-priced call without subscription overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:43:33.325Z","isFirstParty":false}