> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blockworksresearch.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ETF Flows

> ETF flows for Grayscale Bitcoin Trust ETF (GBTC)

## Overview

* **Denomination:** USD
* **Type:** USD Value
* **Interval:** Daily
* **Source:** Blockworks

## Example Request

<CodeGroup>
  ```bash cURL theme={null}
  curl -H "x-api-key: YOUR_API_KEY" \
    "https://api.blockworks.com/v1/metrics/etf-flows-usd?project=GBTC"
  ```

  ```typescript TypeScript theme={null}
  const res = await fetch(
    'https://api.blockworks.com/v1/metrics/etf-flows-usd?project=GBTC',
    { headers: { 'x-api-key': 'YOUR_API_KEY' } }
  )
  const data = await res.json()
  ```

  ```python Python theme={null}
  import requests

  r = requests.get(
    'https://api.blockworks.com/v1/metrics/etf-flows-usd',
    headers={'x-api-key': 'YOUR_API_KEY'},
    params={'project': 'GBTC'}
  )
  data = r.json()
  ```
</CodeGroup>

## Example Response

```json theme={null}
{
  "gbtc": [
    {
      "date": "2026-04-17",
      "value": null
    },
    {
      "date": "2026-04-16",
      "value": -23454960
    },
    {
      "date": "2026-04-15",
      "value": 0
    }
  ]
}
```

## Notes

* Intervals are daily unless otherwise noted.
* Data is updated daily and may be revised after late-arriving data.


## OpenAPI

````yaml GET /v1/metrics/etf-flows-usd
openapi: 3.0.0
info:
  title: Blockworks API
  description: ''
  version: 1.0.0
  contact: {}
servers:
  - url: https://api.blockworks.com
security:
  - x-api-key: []
tags: []
paths:
  /v1/metrics/etf-flows-usd:
    get:
      summary: Etf Flows Usd
      description: Retrieve the 'etf-flows-usd' metric for supported projects.
      operationId: MetricController_getResults_v1_etf_flows_usd
      parameters:
        - name: project
          in: query
          required: true
          description: Project slug (comma-separated for multiple).
          schema:
            type: string
            enum:
              - ARKB
              - BITB
              - BRRR
              - BTC
              - BTCO
              - BTCW
              - CETH
              - ETH
              - ETHA
              - ETHE
              - ETHV
              - ETHW
              - EZBC
              - EZET
              - FBTC
              - FETH
              - GBTC
              - HODL
              - IBIT
              - QETH
              - SSK
            example: ARKB
          examples:
            ARKB:
              value: ARKB
              summary: ARKB
            BITB:
              value: BITB
              summary: BITB
            BRRR:
              value: BRRR
              summary: BRRR
            BTC:
              value: BTC
              summary: BTC
            BTCO:
              value: BTCO
              summary: BTCO
            BTCW:
              value: BTCW
              summary: BTCW
            CETH:
              value: CETH
              summary: CETH
            ETH:
              value: ETH
              summary: ETH
            ETHA:
              value: ETHA
              summary: ETHA
            ETHE:
              value: ETHE
              summary: ETHE
            ETHV:
              value: ETHV
              summary: ETHV
            ETHW:
              value: ETHW
              summary: ETHW
            EZBC:
              value: EZBC
              summary: EZBC
            EZET:
              value: EZET
              summary: EZET
            FBTC:
              value: FBTC
              summary: FBTC
            FETH:
              value: FETH
              summary: FETH
            GBTC:
              value: GBTC
              summary: GBTC
            HODL:
              value: HODL
              summary: HODL
            IBIT:
              value: IBIT
              summary: IBIT
            QETH:
              value: QETH
              summary: QETH
            SSK:
              value: SSK
              summary: SSK
            multi:
              value: ARKB,BITB
              summary: ARKB + BITB
        - name: start_date
          in: query
          required: false
          schema:
            type: string
            format: date
          description: Start date (YYYY-MM-DD)
        - name: end_date
          in: query
          required: false
          schema:
            type: string
            format: date
          description: End date (YYYY-MM-DD)
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  type: array
                  items:
                    type: object
                    additionalProperties: true
              example:
                projectName:
                  - date: '2025-08-10'
                    value: 123456.789
                  - date: '2025-08-11'
                    value: 234567.89
                  - date: '2025-08-12'
                    value: 345678.901
        '400':
          description: Bad Request
        '404':
          description: Not Found
      security:
        - x-api-key: []
components:
  securitySchemes:
    x-api-key:
      type: apiKey
      in: header
      name: x-api-key

````