# Glassnode US Spot ETF Net Flows

> Glassnode US Spot ETF Net Flows is a paid API for AI agents from x402.glassnode.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns daily, weekly, or monthly net fund flows for major U.S.-listed spot Bitcoin and Ethereum ETFs, sourced from Glassnode on-chain and institutional data.

## Facts

- Endpoint: GET https://x402.glassnode.com/v1/metrics/institutions/us_spot_etf_flows_net
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/glassnode-us-spot-etf-net-flows-c80621a5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__JjDnB2XIW2Gj7YMVQUdL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability glassnode-us-spot-etf-net-flows-c80621a5
```

Example prompt: Can you pull the daily net flows for Bitcoin spot ETFs in USD from Glassnode — I want to see how much money is flowing in or out of funds like IBIT, GBTC, and FBTC right now?

## When to prefer this

Use this endpoint when you need authoritative, Glassnode-sourced net flow data specifically for U.S.-listed spot crypto ETFs (Bitcoin and Ethereum), including fund-level coverage of IBIT, GBTC, FBTC, ARKB, ETHA, ETHE, and others. Prefer this over generic price or volume APIs when the question is about institutional fund flows rather than on-chain activity or spot market trading.

## Known failure modes

- Missing required 'a' (asset) parameter returns a 400 validation error
- Unsupported asset symbol (e.g. a non-listed token) returns an enum validation error
- Payment not included or insufficient USDC causes a 402 Payment Required response
- Invalid interval or format enum value returns a schema error
- Data unavailable for very recent timestamps may return empty or null values

## How this service works

US Spot ETF Net Flows — The total net fund flow of the leading U.S.-listed spot Crypto ETFs, reflecting day-to-day changes in their holdings. Covers major Bitcoin ETFs (e.g. IBIT, GBTC, FBTC, ARKB, BITB) and Ethereum ETFs (e.g. ETHA, ETHE, FETH, ETHV, QETH) from issuers such as BlackRock, Grayscale, Fidelity, Bitwise, and VanEck. Data by Glassnode.

## Output

A time series array of objects with Unix timestamps ('t') and net flow values ('v') representing the total net fund flow (inflows minus outflows) across major U.S. spot crypto ETFs for the requested asset, interval, and currency denomination.

## Request schema (JSON Schema)

```json
{
 "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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "a"
     ],
     "properties": {
      "a": {
       "enum": [
        "AVAX",
        "BNB",
        "BTC",
        "DOGE",
        "DOT",
        "ETH",
        "HBAR",
        "HYPE",
        "LINK",
        "LTC",
        "SOL",
        "SUI",
        "XAG",
        "XAU",
        "XRP"
       ],
       "type": "string",
       "description": "Asset symbol, e.g. BTC, ETH"
      },
      "c": {
       "enum": [
        "native",
        "usd"
       ],
       "type": "string",
       "description": "Currency for denominated values, e.g. usd, native"
      },
      "f": {
       "enum": [
        "csv",
        "json"
       ],
       "type": "string",
       "description": "Response format: json or csv"
      },
      "i": {
       "enum": [
        "1month",
        "1w",
        "24h"
       ],
       "type": "string",
       "description": "Time interval / resolution, e.g. 24h, 1w, 1month"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "array",
     "items": {
      "type": "object",
      "properties": {
       "t": {
        "type": "number"
       },
       "v": {
        "type": "number"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/glassnode-us-spot-etf-net-flows-c80621a5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.glassnode.com](https://www.zero.xyz/host/x402.glassnode.com/llms.txt)