{"uid":"cap_I87hHySTue3i36xGHfL2g","slug":"glassnode-herfindahl-index-decentralization-metric-05f5ef2b","name":"Glassnode Herfindahl Index (Decentralization Metric)","description":"Herfindahl Index — Herfindahl Index, originally a measure of competition, is adapted here as a metric for decentralization. It is defined as the sum of squared address shares of current supply across the network. Data by Glassnode.","url":"https://x402.glassnode.com/v1/metrics/distribution/herfindahl","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","required":["a"],"properties":{"a":{"type":"string","description":"Asset symbol, e.g. BTC, ETH"},"c":{"enum":["native"],"type":"string","description":"Currency for denominated values, e.g. usd, native"},"f":{"enum":["csv","json"],"type":"string","description":"Response format: json or csv"},"i":{"enum":["24h"],"type":"string","description":"Time interval / resolution, e.g. 24h, 1w, 1month"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"array","items":{"type":"object","required":["t"],"properties":{"o":{"type":"object","description":"Nested value object for multi-field metrics (e.g. OHLC)"},"t":{"type":"integer","description":"UNIX timestamp (seconds, UTC) for the start of the interval"},"v":{"type":"number","description":"Scalar metric value at the given timestamp"}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_v47AD4nWcKEEJnMAZftOr","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the Herfindahl Index for a crypto asset, measuring supply concentration/decentralization as the sum of squared address shares of current supply.","exampleAgentPrompt":"Can you pull the Glassnode Herfindahl Index for Bitcoin to see how concentrated BTC supply is across addresses right now — give me the latest 24h data in JSON?","exampleUseCases":[{"title":"Monitor Bitcoin whale concentration trends","prompt":"Can you check Bitcoin's Herfindahl Index over the past month and let me know if whale concentration is getting worse or improving? I want to see if large holders are accumulating or dispersing."},{"title":"Compare decentralization across crypto assets","prompt":"Pull the latest Herfindahl Index for Bitcoin, Ethereum, and Cardano so I can compare which network has the most decentralized supply distribution right now."},{"title":"Alert on supply concentration changes","prompt":"Fetch the Herfindahl Index for Ethereum from the last 7 days and flag any sharp movements that might indicate major address consolidation or distribution happening on the network."}],"resultDescription":"A time-series array of data points, each with a UNIX timestamp (t) and a scalar Herfindahl Index value (v) representing the sum of squared address shares of circulating supply at that interval. Lower values indicate more decentralized supply distribution; higher values indicate greater concentration.","failureModes":["Missing required 'a' (asset) parameter returns a 400 or validation error","Unsupported asset symbol (e.g. a non-indexed token) may return empty data or 404","Invalid interval or format enum values result in a schema validation error","Payment not fulfilled (x402 protocol) results in a 402 Payment Required response","Rate limiting or quota exhaustion may return 429 Too Many Requests"],"whenToPreferThis":"Use this endpoint when you need a quantitative, Glassnode-sourced measure of supply concentration or decentralization for a specific crypto asset. It is ideal for on-chain analysts, portfolio managers, or researchers comparing the degree of wealth concentration across blockchain networks over time. Prefer this over generic holder-count or whale metrics when a single normalized index of address-share inequality is needed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:04:33.069Z","isFirstParty":false}