# ETF Flows – Spot Bitcoin/Ethereum ETF Daily Net Creation/Redemption Data

> ETF Flows – Spot Bitcoin/Ethereum ETF Daily Net Creation/Redemption Data is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns daily net creation/redemption flow data (per-fund and aggregate) for spot Bitcoin or Ethereum ETFs by region, computed from issuer holdings disclosures.

## Facts

- Endpoint: GET https://payai.agentstools.dev/etf/flows
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/etf-flows-spot-bitcoin-ethereum-etf-daily-net-creation-redemption-data-743a008f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WonnGqtrOwFg9jae9iRT-

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 etf-flows-spot-bitcoin-ethereum-etf-daily-net-creation-redemption-data-743a008f
```

Example prompt: What's the latest daily net creation and redemption flow across all US spot Bitcoin ETFs — give me per-fund and total figures in both USD and BTC for today?

## When to prefer this

Use this endpoint when you need normalized, aggregated spot crypto ETF flow data (creation/redemption) without having to poll each issuer's disclosure site individually and manually difference holdings. Ideal for financial analysis, market monitoring, or reporting on institutional Bitcoin or Ethereum ETF activity in the US market. Prefer this over manual scraping of issuer sites when you need a single, consistent data format across all funds.

## Known failure modes

- Invalid asset value (not 'btc' or 'eth') returns a validation error
- Invalid region value (not 'us' or 'hk') returns a validation error
- HK region data may be scaffolded/incomplete as it is not yet fully live
- Upstream issuer disclosure data unavailable or delayed may result in stale or missing flow figures
- Payment not included or insufficient USDC results in 402 Payment Required response

## How this service works

Daily net creation/redemption flow for spot Bitcoin or Ethereum ETFs, computed from each issuer's own holdings disclosure: per-fund and total net flow in USD and coin for the latest day, a recent series and the window cumulative. One normalized call instead of polling each issuer site and differencing units.

## Output

A JSON response containing: per-fund net flow in USD and coin units, total aggregate net flow across all issuers in USD and coin, a recent time series of daily flows, and the cumulative flow over the reporting window — all normalized from each issuer's holdings disclosure for the specified asset (btc or eth) and region (us or hk).

## 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",
      "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"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/etf-flows-spot-bitcoin-ethereum-etf-daily-net-creation-redemption-data-743a008f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)