{"uid":"cap_vhJu_DxazCW-rDCzfAFpU","slug":"etf-holdings-spot-bitcoin-ethereum-etf-data-dab8647a","name":"ETF Holdings – Spot Bitcoin & Ethereum ETF Data","description":"Latest holdings for spot Bitcoin or Ethereum ETFs from issuer disclosures: per-fund coin units (or shares), market value and shares outstanding, plus total AUM across funds and the largest fund's AUM share. One normalized call.","url":"https://api.agentstools.dev/etf/holdings","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","required":["asset","region"],"properties":{"asset":{"enum":["btc","eth"],"type":"string","description":"Crypto asset whose spot ETFs to report: btc or eth."},"region":{"enum":["us","hk"],"type":"string","description":"ETF listing region: us (live) or hk (scaffold)."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_dYImb7x7UCcP4g-aW7OFF","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns latest per-fund holdings (coin units, market value, shares outstanding) and aggregate AUM stats for spot Bitcoin or Ethereum ETFs from issuer disclosures, for US or HK markets.","exampleAgentPrompt":"Can you pull the latest holdings data for all US spot Bitcoin ETFs — I want to see how many BTC units each fund holds, their market values, and what fraction of total AUM the biggest fund controls?","exampleUseCases":[{"title":"Bitcoin ETF market concentration check","prompt":"What does the US spot Bitcoin ETF landscape look like right now — which fund is the biggest and what share of total AUM does it hold?"},{"title":"Ethereum ETF institutional flow tracking","prompt":"Pull the latest holdings for all US spot Ethereum ETFs so I can see total AUM, shares outstanding per fund, and the market value of their ETH positions."},{"title":"Crypto ETF research report data","prompt":"I'm writing a report on crypto ETF adoption — can you get me the current BTC ETF holdings breakdown for US-listed funds, including coin units and market values for each issuer?"}],"resultDescription":"Returns a normalized JSON object with per-fund data (coin units or shares held, market value, shares outstanding) sourced from issuer disclosures, plus aggregate metrics: total AUM across all funds in the requested asset/region, and the AUM share held by the largest single fund.","failureModes":["Invalid asset enum value (not 'btc' or 'eth') returns a 422 validation error","Invalid region enum value (not 'us' or 'hk') returns a 422 validation error","HK region is currently a scaffold and may return incomplete or placeholder data","Issuer disclosure data may lag real-time prices, causing stale market values","Payment failure (insufficient USDC balance) returns a 402 error"],"whenToPreferThis":"Use this endpoint when you need a single normalized call that aggregates spot crypto ETF holdings across all major issuers for a given asset and region, rather than scraping individual fund disclosures. Ideal for agents that need AUM concentration metrics, per-fund coin unit counts, and market values in one structured response without building custom ETF data pipelines.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:57:37.509Z","isFirstParty":false}