You don't need a whole Bitcoin: the real cost of buying small

"How little Bitcoin can I buy?" is one of the questions beginners ask us most. The short answer: far less than you think. Bitcoin divides to eight decimal places, so you never need the price of a whole coin. But "how little can I buy" and "how little is worth buying" are different questions. On a small order, a fixed fee of a few dollars can take a big bite out of your money.

01How little Bitcoin can you buy? Start with satoshis

Bitcoin's smallest unit is the satoshi (sat): 1 BTC = 100,000,000 sats. Buying 0.001 BTC or 0.0001 BTC is completely normal. Almost every exchange lets you order in your own currency — type "¥1,000" or "₩10,000" and the app works out how much Bitcoin that buys. When Korean users talk about sosujeom gumae (buying by the decimal) or jjogaeseo gumae (buying in pieces), this is what they mean.

So the limit isn't Bitcoin itself. It's the platform's minimum order and its fee structure. Here is what that looks like around Asia.

02Minimum purchase amounts on Asian platforms

These are examples we checked during our country research. Minimums and fees change often, so confirm on the official site before ordering.

Sources: official sites and our country research. Items marked “reportedly” or “per reviews” come from secondary sources and were not individually confirmed on the official page.

For more on platforms in these markets, see buying crypto in Japan and buying crypto in South Korea.

03How fixed fees eat small orders

A percentage fee treats big and small orders alike. A fixed fee doesn't. Many card channels and third-party buy widgets have minimum charges, and withdrawals to a wallet are priced in fixed amounts. Here is a hypothetical order charged a $3 fixed fee plus 0.5%.

Withdrawal fees are the other fixed cost people overlook. CEX.IO charges 0.0005 BTC to withdraw Bitcoin and Upbit 0.0002 BTC. If you bought only 0.001 BTC and withdraw it for 0.0005 BTC, you've paid half. Japanese yen withdrawals also carry flat fees — ¥407 per withdrawal at Coincheck, ¥220–770 at bitFlyer depending on bank and amount.

04Buying ¥1 million of Bitcoin: the channel matters more than the day

Japanese readers often search for how to buy ¥1 million (hyakuman-en) of Bitcoin. Whether you buy it in one go or in parts, look at channel costs first. On a hanbaisho (dealer) screen, Coincheck discloses spreads of 0.1% to 5.0%; at 1–5%, that's ¥10,000–50,000 of hidden cost on ¥1 million. On an order-book exchange, GMO Coin's taker fee on BTC is 0.05% — about ¥500 — and Coincheck charges 0% on its BTC order book.

In other words, for a large purchase the gap between channels is easier to measure than the gap between days. Whether to buy at once or in stages is your call; the next section explains the logic of staged buying neutrally.

05Dollar-cost averaging: what it is and isn't

Dollar-cost averaging (DCA) — tsumitate in Japan, jeongnip (적립) in Korea, 定投 in Chinese — means buying a fixed amount at fixed intervals, say ¥5,000 every Monday, whatever the price. When prices are high you get less; when they're low you get more, and your average entry price smooths out over time.

Its main benefit is psychological: you stop asking "is now the right moment?" every day, and you're less likely to put a large sum in on impulse. It also has clear limits:

• No guaranteed profit. If an asset falls for a long time, DCA just means you keep buying on the way down.
• Fees on every purchase. The more often and the smaller you buy, the more fixed fees matter (see above).
• Not always better than a lump sum. In a steadily rising market, staged buying ends up with a higher average cost.

We don't rank DCA against lump-sum buying, and we don't suggest coins, amounts or frequencies. If you're thinking of automating DCA with a bot, see the DCA-bot section of our trading bots guide.

06Recurring-buy features on exchanges

Many platforms build DCA in: set it once and it buys on schedule. Japan's GMO Coin tsumitate plan is one of the most clearly documented: from ¥500, daily, weekly or monthly, with no fee for the plan itself. Coincheck, bitFlyer and other Japanese exchanges offer tsumitate plans too; check terms on their own sites. Where Binance operates, its Auto-Invest feature is a common choice, though minimums and availability vary by region. Bitkub in Thailand and Coinhako in Singapore also offer scheduled buys.

1. Confirm the platform is legal where you live

   Only set up recurring buys on a locally licensed or registered platform. Automatic debits mean trusting it with your money for a long time.

2. Check the full cost per purchase

   Does the plan fill at a dealer price or on the order book? Is there a spread? Run one small cycle and compare how much you actually received.

3. Pick an amount you can sustain

   DCA only works if you keep going. Choose a sum that wouldn’t hurt even after several months of losses.

4. Review quarterly, don’t watch daily

   Check your records and costs every few months, and export the history for your tax return.

07Where to keep small amounts

For very small amounts, a licensed exchange is a reasonable compromise: withdrawal fees are large relative to the balance, and self-custody takes some learning. Once regular purchases add up, move them in one transfer to a wallet where you hold the keys — that spreads the fee and reduces exchange risk. Before your first withdrawal, read our security guide and test the address and network with a tiny amount.

FAQ

Sources

• GMO Coin — tsumitate crypto plan (¥500 minimum, no plan fee) · checked Oct 2026
• Coincheck — fee page (dealer spread 0.1–5.0%) · checked Oct 2026
• Upbit — service guide (deposits, fees) · checked Oct 2026

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