---
title: "Spot BTC and ETH ETF flows and holdings"
method: GET
path: "/api/markets/etf-flows"
tags: ["Crypto"]
---

# Spot BTC and ETH ETF flows and holdings

`GET /api/markets/etf-flows`

## Request

- Base URL: `https://xoomar.com`
- URL: `https://xoomar.com/api/markets/etf-flows`
- Auth: one of:
  - none
  - API key in header `x-api-key`

From the issuers' own daily holdings files: iShares, Bitwise and ARK 21Shares for bitcoin, iShares and Bitwise for ether. History from 20 August 2026. Docs: https://xoomar.com/markets/api/etf-flows

## Query parameters

- `asset` 'btc' | 'eth'
- `days` integer

## Response `200`

OK

- object
  - `data` object[]
    - `date` string, date: The as-of date of the issuer file
    - `ticker` string: Fund ticker (IBIT, ETHA...)
    - `issuer` string: Issuer name
    - `asset` string: btc or eth
    - `holdings` string, nullable: Coins held per the issuer file
    - `flowUsd` string, nullable: Net flow for the day in USD, derived from the change in the fund's reported holdings
    - `aumUsd` string, nullable: Holdings valued in USD
    - `canonicalUrl` string, uri: The matching page on xoomar.com
  - `updatedAt` string, date-time: When the response was built; a few dated feeds give the date of their newest row instead
  - `source` 'xoomar.com'
  - `docs` string
  - `license` string: Data terms
  - `attribution` string
  - `canonicalUrl` string, uri: The matching page on xoomar.com
  - `meta` object: Who publishes the data and how to credit it
    - `source` string: The publisher or publishers of the data, comma-separated
    - `sourceAttribution` string: The credit line to show wherever the data is displayed
    - `notice` string: Requests without a key only: the free key, app registration and the credit

## Other responses

- `404`: Unknown slug, ticker or country
- `429`: Rate limit: 10 requests a minute without a key, 30 with a free key

---

[API](https://skmtc.dev/xoomar/apis/xoomar-market-data-api.md) · [All operations](https://skmtc.dev/xoomar/apis/xoomar-market-data-api/llms.txt) · [OpenAPI document](https://skmtc.dev/xoomar/apis/xoomar-market-data-api/revisions/07b78401eaaa?raw)