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    "title": "📊 ETF Holdings Tracker — Constituents, Weights, AUM",
    "description": "Track ETF constituent holdings, weights, AUM, sector exposure across 100+ major US ETFs including SPY, QQQ, VTI, ARKK, JEPI. Daily holdings data for asset allocators, ETF arbitrageurs, factor investors, index researchers. Bloomberg ETF analytics alternative — pay-per-result, no Bloomberg seat.",
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            "title": "ETF tickers",
            "type": "array",
            "description": "List of US-listed ETF tickers to pull holdings for. Each ETF is fetched independently and emits one holding record per constituent (typically 10-500 constituents per ETF depending on the index). Defaults to the three most-traded core ETFs (SPY/QQQ/VTI). Supports all 100+ ETFs covered by stockanalysis.com including iShares, Vanguard, State Street, Invesco, ARK, JPMorgan, Schwab issuers.",
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              "United States",
              "China",
              "Japan",
              "United Kingdom",
              "Canada",
              "Germany",
              "France",
              "Switzerland",
              "Taiwan",
              "India",
              "Brazil",
              "South Korea",
              "Netherlands",
              "Australia"
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            "description": "Filter holdings by issuer country of incorporation. 'all' returns everything; pick a specific country to isolate (for example) Chinese ADRs inside KWEB or Japanese names inside EWJ. Most US-domiciled ETFs are 100% US holdings — this is primarily useful for international/global ETFs like EEM, EFA, VEA, IEMG.",
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            "title": "ETF issuer filter",
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              "Vanguard",
              "State Street",
              "Invesco",
              "ARK",
              "JPMorgan",
              "Schwab",
              "First Trust",
              "Direxion",
              "ProShares",
              "WisdomTree"
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            "type": "string",
            "description": "Filter the requested ETFs by sponsor. Useful when you pass a long list of tickers but only want (e.g.) all iShares ETFs. 'all' returns every issuer. Issuer is inferred from the ETF's name.",
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