{"uid":"cap_IWePmMIW4zIqiKgX947d_","slug":"origin-mcp-fly-dev-e00d3060","name":"Basescan Token Holders & Concentration Metrics","description":"Get holder count and top holders for a token with concentration metrics (HHI)","url":"https://origin-mcp.fly.dev/mcp/tools/basescan_token_holders","method":"GET","headers":{},"bodySchema":{"properties":{"input":{"required":["method"],"properties":{"method":{"enum":["GET"],"type":"string"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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_yfFC0ETYt6RtgJRo_txQJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns holder count, top holders list, and Herfindahl-Hirschman Index (HHI) concentration metrics for a given token on Base","exampleAgentPrompt":"Can you pull up the holder count and top holders for token contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, and show me the HHI concentration score so I can see if it's whale-dominated?","exampleUseCases":null,"resultDescription":"Returns total number of token holders, a ranked list of top wallet addresses with their balance and percentage of supply, and an HHI (Herfindahl-Hirschman Index) score indicating how concentrated ownership is among top holders.","failureModes":["Invalid or non-existent contract address returns an error or empty result","Token not indexed on Basescan returns no data","Rate limiting or upstream Basescan API unavailability causes timeout","Non-Base network contract addresses may not resolve correctly"],"whenToPreferThis":"Use this endpoint when you need on-chain holder distribution data for a token on the Base network, especially when assessing decentralization, rug-pull risk, or whale concentration via the HHI metric. Prefer this over generic block explorers when you need structured, pre-computed concentration metrics rather than raw data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:44:54.583Z","isFirstParty":false}