All sections
68 sections of the site, grouped the same way as the menu. Quick search across the whole site: Ctrl+K (⌘K on Mac).
Share this page
Market & data
- Network liveLive bitcoin block height, hashrate chart, next difficulty adjustment, fee rates, mempool size and countdown to the 2028 halving.
- BTC calculatorSats to BTC and BTC to sats converter: turn satoshis, BTC and mBTC into dollars, euros, rubles and yuan at the live bitcoin price. ECB and Bank of Russia rates.
- All Bitcoin toolsFree Bitcoin tools: fee, mining, DCA and what-if calculators, MVRV, rainbow, stock-to-flow, halving countdown. Live data, sources, no sign-up.
- Bitcoin ETFsDaily net flows for every US spot bitcoin ETF, cumulative inflows since January 2024 and how much BTC the funds hold.
- Risk On/OffA 0–100 Bitcoin market-mood score from Fear & Greed, trend, volatility, MVRV and ETF flows, with every formula and source shown. Not investment advice.
- VolatilityAnnualised realised volatility of Bitcoin over 7/30/90/365 days, a rolling 30-day chart and yearly history, from daily closes.
- Price in other currenciesLive Bitcoin price in 20 currencies at official reference rates, with sats conversion for each. Sources and rate times shown. Free, no sign-up.
- Who holds BTCBitcoin held by public and private companies, ETFs and funds, governments and exchanges, with the largest holders and 7-day changes.
- Holders: shrimp to humpbackBitcoin addresses by balance: how many hold 1, 10, 100, 1,000 BTC and how coins split from shrimp to humpback. Addresses, not people. Data as of 16 Oct 2026.
- Derivatives: OI, funding, liquidationsBTC perpetual futures open interest and funding rate on Binance, Bybit, OKX and Deribit, a 30-day history and recent liquidations, from public keyless exchange APIs. Source and time on every block. Not advice.
- Stablecoins on BitcoinLive tracker of stablecoins on Bitcoin layers: Tether USDT on Liquid, Omni, Taproot Assets and RGB, Brale USDB on Spark, DePix, Stable Channels. Status, supply, wallets, risks, sources.
- Chart analystLive BTC/USD candlestick chart with an AI analyst: ask in plain words and it draws support, resistance, trendlines, MA and RSI from real candles.
- AI searchAsk a question in plain words and get a short answer built only from this site's pages and live data (price, network, ETFs, holders, nodes), with links to the sources. Free daily answers.
On-chain & cycles
- On-chain & modelsMVRV, realized price, NUPL, SOPR, LTH/STH, power law, stock-to-flow, Mayer multiple, 200-week MA and Puell multiple, explained simply.
- Rainbow & cyclesRainbow chart on real price history, halvings, cycle tops and bottoms, drawdowns and all cycles side by side. Educational, not advice.
- Rainbow chart (model)Our open log-regression rainbow chart for Bitcoin with the fitted formula, today's deviation in σ and clear limits. A model, not a forecast.
- Stock-to-flow (model)Stock-to-flow ratio and PlanB's 2019 model against the real Bitcoin price, with the formula and why the model diverged. Not a forecast.
- Nodes onlineHow many Bitcoin nodes are reachable right now: trend, Tor/IPv4/I2P share, countries, Bitcoin Core and Knots versions, OP_RETURN policy and BIP-110 signalling, hosting concentration, Lightning nodes. How to run your own node, even on solar power.
- Bitcoin codeLive Bitcoin Core repository stats: commits per week, merged pull requests, open PRs, latest releases (31.x) with notes, maintainers and contributors. BIPs incl. BIP-110 status, Bitcoin Knots, Lightning implementations, how to contribute and verify releases.
- Lightning NetworkEverything about the Bitcoin Lightning Network: channels, HTLCs, invoices (BOLT11, BOLT12, LNURL, Lightning Address), live capacity and fees, top nodes, LND/CLN/Eclair/LDK, wallets, LSPs, L402 for AI agents, zaps, risks and guides.
Mining
- Pools & Stratum V2Every major Bitcoin mining pool in one table: live hashrate share, payout scheme (FPPS, PPLNS, solo), fee, Stratum V2 and official site. Plus how to choose a pool.
- ASIC shopBitcoin ASIC miner catalogue with live profitability, hashprice, break-even, mining pools compared (fees, payout schemes, stratum URLs) and bitcoin issuance by year.
- Mining: cooling & powerAir, immersion and hydro cooling with real models (Antminer S21, S21 Imm, S21 XP Hyd, WhatsMiner M63S, Fog Hashing, BitCool), heat reuse (Heatbit, Avalon Nano 3S), power from grid, gas gensets, flare gas, solar, wind and hydro, electrical basics and a live kWh breakeven calculator.
- Mining calculatorEstimate BTC mined per day, revenue, power cost and break-even electricity price for your ASIC using live network hashrate, price and fees.
- FPPS hashrate placementPoint your ASICs at our stratum and get a fixed payout per share including average transaction fees, with no pool luck variance. Daily payouts to your BTC address, dashboard, live FPPS calculator, FPPS vs PPLNS vs solo, hashrate- and ASIC-backed loans explained with a loan calculator, FAQ. Fee and terms on request.
Wallets & buy
- WalletsHardware and paper cold wallets compared, whale wallets, Whale Alert transfers, exchange reserves and BTC-backed credit.
- Buy & trade BTCWhere Bitcoin trades (CEX, DEX, P2P) and plain-language buying approaches, with a link to the DCA calculator on real historical prices.
- DCA calculatorSee what buying the same amount of Bitcoin every week or month would be worth today, on real daily prices since 2010. Year-by-year table, comparison with one purchase. Free, no sign-up.
- Fee calculatorEstimate a Bitcoin transaction fee from size in vB and live mempool fee rates, for SegWit, Taproot and legacy addresses.
- Bitcoin ATM mapInteractive map of Bitcoin ATMs from OpenStreetMap with country and city filters, nearest-to-me search, a beginner guide, fees and a scam warning.
- AML checkFree AML check for a Bitcoin address or transaction: OFAC SDN sanctions list, exchange labels and on-chain facts. What a result means. Not a risk score.
- Hacks & lossesMt. Gox, Bitfinex, Bitstamp, Binance, DMM and more: BTC stolen, value then and at today's price, what happened to the coins. Lost coins estimates and the Pizza Day story.
Credit & services
- BTC creditCompare BTC-backed loans from banks and lenders: rates, loan-to-value, custody model and liquidation risk explained.
- Hashrate-backed loansPoint your ASICs at our stratum and get a fixed payout per share including average transaction fees, with no pool luck variance. Daily payouts to your BTC address, dashboard, live FPPS calculator, FPPS vs PPLNS vs solo, hashrate- and ASIC-backed loans explained with a loan calculator, FAQ. Fee and terms on request.
Learn
- Orange pillBitcoin for newcomers: why only 21 million will exist, honest answers to 10 common doubts (energy, crime, bans, quantum), a 5-minute safe start, and books to read. Not investment advice.
- LearnBitcoin from zero, a glossary and FAQ, plus security guides: seed backups, multisig, inheritance, verifying wallets and running your own node.
- The Bitcoin Standard course
- Bitcoin WikiAn encyclopedia of Bitcoin in plain words: 150+ interlinked articles on the protocol, mining, Lightning, wallets, people, companies, ETFs, history and memes, with sources and live network data.
- Theories about BitcoinWhat-if stories built on Bitcoin's real rules and real physics: Bitcoin on Mars, Bitcoin after the last coin in 2140, quantum computers vs Bitcoin, Bitcoin on the Moon. Computed, sourced, not forecasts.
- HyperbitcoinizationWhat hyperbitcoinization means in plain words: Daniel Krawisz's 2014 term, the four stages of money, Gresham's and Thiers' laws, live indicators (Bitcoin vs gold, ETF and treasury share, nodes, Lightning, legal tender), verified quotes, arguments for and against, timeline and FAQ.
- Bitcoin is DeadA verified timeline of media and expert claims that Bitcoin is dead, doomed or a scam: date, who said it, the exact quote, source link, archive copy and the BTC price that day versus today. Media history, not a forecast.
- Bitcoin Law Around the WorldA sourced guide to the laws that touch Bitcoin directly or indirectly in 42 countries and territories, the EU and offshore centres: legal status, tax, ETFs, state reserves, mining, bans, with a detailed United States section (CLARITY, GENIUS, executive orders, SEC, IRS, FinCEN). Status as of 16 Oct 2026. Not legal advice.
- Historic videosA video hall of 30+ historic Bitcoin videos: Andreas Antonopoulos's 2013 talk to an almost empty room, Senate hearings, Mt. Gox, Buffett's “rat poison squared”, Saylor, El Salvador, 3Blue1Brown. Why each matters, views, date and BTC price then vs now.
- Bitcoin for AIWhy AI agents need Bitcoin, explained with honest caveats: a catalog of agent payment protocols (L402, HTTP 402, Lightning Agent Tools, NWC, Alby MCP, BOLT12, Cashu, Fedimint, Routstr, PPQ.ai, Fewsats, x402) with code, live Lightning data and a card vs Lightning fee calculator.
- Bitcoin Metaverse 3DWalk through Bitcoin in 3D: live mempool blocks, a globe of nodes, mining pool rings, ETF and treasury towers, whale transfers, the halving clock and a museum avenue. Every object links to the data.
People & companies
- Bitcoin peopleBitcoin Core maintainers and contributors, Bitcoin-only voices on X and Bitcoin YouTube channels, each verified, with follow buttons.
- Early BitcoinersWho built Bitcoin: sourced profiles of cypherpunks, Satoshi Nakamoto, early developers and Core contributors, with key facts and primary sources.
- Satoshi Nakamoto
- Michael Saylor
- Randi Hipper
- Companies
- InfluencersDirectory of bitcoin voices and influencers with topics and links.
- Bitcoin MuseumInteractive Bitcoin history: whitepaper, genesis block, Pizza Day, halvings, SegWit, Taproot, ETFs. Famous blocks and transactions, Satoshi quotes and early prices, all with sources.
Community, news & events
- Subscribe: daily email
- NewsLatest bitcoin news and large on-chain transfers tracked by our desk.
- Verified Bitcoin newsImportant Bitcoin news checked against independent sources: confirmed, partly confirmed or contradicted, with links to every source. No hype, no investment advice.
- BlogShort articles on what matters in Bitcoin: protocol debates, security incidents, companies, conferences and history. Every fact is sourced; expectations are labelled.
- Bitcoin calendarGenesis Day, Pizza Day, Whitepaper Day and other Bitcoin holidays, a live countdown to the next halving and upcoming conferences. Download as .ics.
- EventsBitcoin-only conferences in 2026 and 2027 with dates, cities and links, plus Token2049 and Korea Blockchain Week side events.
- ForumCommunity discussion for every block on the site: ETF flows, on-chain metrics, network data, guides and articles. Read freely, sign in with X to post.
- Bitcoin memesA hall of classic Bitcoin memes with the origin story, date and a link to the original post: HODL, Bitcoin Pizza Day, magic internet money, 1 BTC = 1 BTC, laser eyes, number go up and more. Share any meme as a card.
- BTC ARTBitcoin-themed art and collections: browse the pieces and filter them by collection.
Apps & site
- About 21 BTC: how we show data21 BTC is a free, Bitcoin-only research site run by one person with AI. Where each number comes from, how it is funded and how to reach us.
- Apps: Android & iPhoneInstall 21 BTC on Android (APK, no browser bar) or add it to your iPhone Home Screen from Safari in three taps. Live prices, free, no sign-up.
- Open API for AI agentsFree read-only JSON endpoints for Bitcoin price, ETF flows, holders, risk score, volatility and models. No key, 60 requests/min.
- MCP server for AI agentsA free Model Context Protocol server for Bitcoin data: price, ETF flows, risk, fees, network stats, derivatives, glossary search and events. No keys, read-only tools, 60 requests per minute. Server card included.
- ChangelogReal shipped changes to 21btc.cc: new pages, data, fixes and speed work, with dates, links and an RSS feed.
- vs Glassnode & CoinGlassWhat 21btc.cc covers for free compared with Glassnode and CoinGlass, what it doesn't, and when to use them instead.