Cumulative running-sum flow time series for the asset.

The 'up and to the right' curve — each point is the running total of daily net flow at end-of-day. Good for plotting AUM accumulation against price.

Path parameters

Segments of the URL path, validated server-side.

Query parameters

All query parameters are optional unless marked required.

Response shape

Always wrapped in the standard envelope. Nullable fields are explicitly marked — treat missing numeric data as a real data-source gap, not as an error.

// Wrapped in the standard envelope:
// {
//   data: /* shape below */,
//   meta?: { total?: number; limit?: number; offset?: number; ... }
// }

{
  asset: "BTC" | "ETH";
  days: number;
  points: Array<{ date: string; cumulativeUsdM: number }>;  // oldest → newest
}

Example

Copy the curl, replace YOUR_KEY with a real key from your dashboard, and run.

curl -sS "http://localhost:3000/api/v1/etf/btc/cumulative?days=180" \
  -H "Authorization: Bearer cg_live_YOUR_KEY"

{
  "data": {
    "asset": "BTC",
    "days": 180,
    "points": [
      { "date": "2025-10-19", "cumulativeUsdM": 38000.0 },
      { "date": "2025-10-20", "cumulativeUsdM": 38112.4 },
      { "date": "2025-10-21", "cumulativeUsdM": 38200.5 }
    ]
  },
  "meta": { "total": 3, "days": 180, "asset": "BTC" }
}

Notes

• Cumulative is windowed — it's the running sum WITHIN the requested window, not lifetime AUM. Use `/aum` for lifetime.