99Bitcoins Market Indices
Four readings we compute ourselves from our own market snapshots — a capitalisation index, a sentiment score, an altcoin-season gauge and the dominance split. No third-party widgets.
99BTC 20 Index
Top 20 by market capA capitalisation-weighted index of the twenty largest assets in our coverage, recomputed on every market snapshot. It moves with the part of the market that actually carries weight, which makes it a cleaner read on direction than a simple average across hundreds of coins.
Fear & Greed
0–100Seven-day history. Below 25 is extreme fear; above 75 is extreme greed.
Altcoin Season
30D- Beat BTC (30d)
- 0 / 0
- 7-day reading
- —
- BTC 30d
- —
Share of the top 50 (Bitcoin and stablecoins excluded) that outperformed BTC.
Dominance Split
Live- Breadth
- 31%
- Advancing
- 28
- Declining
- 49
Share of total tracked capitalisation, with dollar-pegged assets separated out so the altcoin share is not overstated.
Market Aggregates
Thirty days of the four numbers that describe the whole market.
Total Market Cap
— —24h Trading Volume
— —Total Value Locked
— —Unique Active Wallets 24h
— —Why we compute our own indices
Embedding somebody else's widget means inheriting their coverage, their refresh cadence and their outages. Every index on this page is derived from snapshots we captured and stored ourselves, which means we can state precisely what went into it, show its history, and keep serving the last known good value when an upstream source has a bad hour.
Definitions
- 99BTC 20 — summed market capitalisation of the twenty largest tracked assets, recorded on each snapshot.
- Fear & Greed — a 0–100 composite of volatility, momentum, volume and breadth.
- Altcoin Season — the share of the top 50 assets, excluding Bitcoin and stablecoins, that outperformed Bitcoin over the window.
- Dominance — each group's market capitalisation as a share of total tracked capitalisation.
- Breadth — the share of tracked non-stablecoin assets trading higher than 24 hours ago.
