Daily spot Ethereum ETF flows — mirrors the shape of the Bitcoin endpoint.

Same shape as `/api/v1/etf/bitcoin`, but for the spot ETH ETF cohort (ETHA, FETH, ETHW, ETHV, etc.). Flows have been noisier than BTC — mixing with staking-yield ETFs makes the aggregate interpretation less clean. Use this endpoint for flow-direction headlines; cross-check against the per-ticker breakdown before trading it.

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; ... }
// }

{
  flows: Array<{
    date: string;
    tickerFlows: Record<string, number>;
    total: number;
  }>;
  cumulative: number;
  rolling7d: number;
  biggestInflow: { date: string; totalUsdM: number } | null;
  biggestOutflow: { date: string; totalUsdM: number } | null;
  topIssuers: Array<{ ticker: string; cumulativeUsdM: number; share: number }>;
}

Example

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

curl -sS "http://localhost:3000/api/v1/etf/ethereum?days=30" \
  -H "Authorization: Bearer cg_live_YOUR_KEY"

{
  "data": {
    "flows": [
      {
        "date": "2026-04-17",
        "tickerFlows": { "ETHA": 22.1, "FETH": 18.4, "ETHV": 5.2 },
        "total": 45.7
      }
    ],
    "cumulative": 2810.33,
    "rolling7d": 88.12,
    "biggestInflow": { "date": "2026-03-21", "totalUsdM": 215.8 },
    "biggestOutflow": { "date": "2026-02-11", "totalUsdM": -120.0 },
    "topIssuers": [
      { "ticker": "ETHA", "cumulativeUsdM": 1400.0, "share": 0.50 }
    ]
  },
  "meta": { "total": 1, "days": 30 }
}

Notes

• Wire shape is 1:1 with the BTC ETF route — same client code works.
• Beware mixing ETHE legacy outflow days with spot-ETF launches; Farside normalises but raw aggregates can spike.