# Market Overview (`market_overview`)

> The global frame in one read: total market cap, BTC and ETH dominance, Fear & Greed, Altcoin Season.

- Category: Market data
- MCP tool: `market_overview`
- REST: `GET /market/overview`
- x402 price: $0.01 per call (USDC on Base)
- HTML: https://www.f1ow.com/docs/tools/market_overview

## What it does

Global market snapshot: total market cap, BTC/ETH dominance, Fear & Greed index, and Altcoin Season index

## Parameters

None.

## Call it

### cURL

```bash
curl "https://mcp.f1ow.com/v1/market/overview" \
  -H "Authorization: Bearer $F1OW_API_KEY"
```

### MCP

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "market_overview",
    "arguments": {}
  }
}
```

### TypeScript

```ts
const res = await fetch("https://mcp.f1ow.com/v1/market/overview", {
  headers: { Authorization: `Bearer ${process.env.F1OW_API_KEY}` },
});
const data = await res.json(); // the tool's result as JSON, typed in the OpenAPI spec
console.log(data);
```

### Python

```python
import os, requests

res = requests.get(
    "https://mcp.f1ow.com/v1/market/overview",
    headers={"Authorization": f"Bearer {os.environ['F1OW_API_KEY']}"},
)
data = res.json()  # the tool's result as JSON, typed in the OpenAPI spec
print(data)
```

### WebSocket

```jsonc
// wss://mcp.f1ow.com/v1/ws — subprotocol "jsonrpc-2.0", Authorization: Bearer <key>
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "market_overview",
    "arguments": {}
  }
}

// Or push a fresh result whenever it changes (minimum interval 15 s)
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "subscriptions/subscribe",
  "params": {
    "name": "market_overview",
    "arguments": {},
    "intervalSeconds": 60
  }
}
```

### x402

```bash
# No account: the first call answers 402 with a PAYMENT-REQUIRED challenge;
# an x402 client pays it in USDC on Base and retries.
curl "https://mcp.f1ow.com/x402/v1/market/overview"
```

## Sample response

Captured 2026-11-13. The JSON is what REST and WebSocket return and the `structuredContent` of an MCP call (trimmed):

```json
{
  "altcoinSeasonIndex": 47,
  "btcDominancePct": 59.637379558453,
  "ethDominancePct": 10.214333791008,
  "fearGreedLabel": "Extreme Fear",
  "fearGreedValue": 20,
  "totalMarketCapUsd": 2313671494496.61,
  "totalVolume24hUsd": 95103917342.86,
  "generatedAt": "2026-11-13T08:05:38.6753119+00:00"
}
```

Over MCP the text report a model reads comes with it:

```text
=== Global Market Overview ===
Total Market Cap:     $2.31T
24h Volume:           $95.10B
BTC Dominance:        59.64%
ETH Dominance:        10.21%
Fear & Greed:         20/100 — Extreme Fear
Altcoin Season Index: 47/100 — Neutral
```

## Related tools

- [Spot & Perp Quotes](https://www.f1ow.com/docs/tools/market_quotes) — Spot and perp mark side by side, with funding, open interest, long/short ratio and the day's liquidations. Five providers merged into one snapshot, cached for thirty seconds.
- [Candles](https://www.f1ow.com/docs/tools/market_candles) — Spot or perpetual OHLCV candles with venue routing and fallback, for the timeframes your analysis needs. For months of paged candles or derivatives series, use Bulk History.
- [Bulk History](https://www.f1ow.com/docs/tools/market_history) — Paged spot/perp candles, aggregate open interest, funding or long/short liquidations. Up to 1,000 rows per call with a backward-page cursor, explicit time bounds and a forming-row flag — for historical research and backtests.
- [Top Movers](https://www.f1ow.com/docs/tools/market_top_movers) — The day's ranked gainers and losers, plus the quieter names already trending more than five percent.