What Is a Crypto Exchange? How They Work and the Main Types

Introduction

If you want to buy or sell crypto, you will almost always start at a crypto exchange. Different kinds of exchange work in very different ways, and those differences matter for both your money and your safety.

You will learn what a crypto exchange is, how one works, the main types, meaning centralized, decentralized, and peer-to-peer, the key idea of ‘custody’, and how to use an exchange safely in India.

What Is a Crypto Exchange?

A crypto exchange is an online platform that lets people buy, sell, and trade cryptos. Its basic job is to connect buyers with sellers, so that someone wanting to sell Bitcoin is matched with someone wanting to buy it at an agreed price. In that sense it works much like a stock brokerage, but for digital assets rather than shares.

Exchanges are the main gateway between ordinary money, such as rupees, and crypto. Many also offer extra features, including different order types, charts, and ways to store your crypto. Underneath all of it, the core purpose stays the same: letting people trade one asset for another safely and at a fair market price.

How Does a Crypto Exchange Work?

Using a typical exchange follows a straightforward sequence. You create an account and, on most regulated platforms, verify your identity through a step called KYC. You then deposit money or crypto, place an order to buy or sell, and the exchange matches your order with someone taking the other side.

Behind the scenes, many exchanges run an ‘order book’, which is a live list of all the buy and sell orders waiting to be matched. The system pairs compatible orders together, often within a fraction of a second. Exchanges earn their money mainly from a small fee on each trade, and those fees vary widely between platforms, so they are worth checking before you commit.

Types of Crypto Exchanges

There are three main types worth knowing, and the sharpest difference between them is ‘custody’, meaning who actually holds your crypto while you use the platform.

Centralized Exchange (CEX)

A company runs the platform, holds your funds for you, which is described as ‘custodial’, and matches trades through its own system. CEXs are usually the easiest route for beginners, with straightforward apps, customer support, and the ability to deposit and withdraw ordinary money such as rupees. The trade-off is that you are relying on that company to keep your funds safe.

Decentralized Exchange (DEX)

A platform that runs on blockchain smart contracts rather than a company. You trade directly from your own wallet and keep control of your funds throughout, which is described as ‘non-custodial’. DEXs offer more control, and they are more complex, usually cannot handle ordinary money directly, and charge network fees on every transaction. Mistakes are generally irreversible.

Peer-to-Peer (P2P)

A model that connects individual buyers and sellers so they deal more directly with each other. The platform typically provides some protection, such as holding the crypto in escrow until both sides complete their part of the deal. It puts you closer to the person on the other side of the trade, so their reputation and rating matter.

Who Holds Your Crypto? Understanding Custody

Custody is the sharpest dividing line between exchange types, and it directly affects your safety. It simply means who is holding your crypto. On a centralized exchange the company holds it for you, rather than a bank holding your cash, which is convenient but means you trust that company’s security and honesty. This is the origin of the crypto saying, not your keys, not your coins.

On a decentralized or peer-to-peer setup, you generally keep your funds in your own wallet for longer, so you depend less on any single company. The trade-off is that you carry more responsibility yourself: if you lose your wallet’s keys or send funds to the wrong address, there may be no company able to help you recover them. Neither approach is simply better, and they suit different needs and levels of experience.

How to Use a Crypto Exchange Safely

Whatever type of exchange you use, a few habits protect both your account and your money.

Choose a Reputable, Regulated Exchange

In India, prefer exchanges registered with the FIU (Financial Intelligence Unit), which follow KYC and anti-money-laundering rules. Registration is not a guarantee of safety, but it does mean the platform operates under a recognised compliance framework. Check the platform’s security track record before you deposit anything.

Protect Your Account

Use a strong, unique password and turn on two-factor authentication. Stay alert to phishing links and fake apps, which often copy a real exchange’s name and design almost exactly. No genuine exchange or support agent will ever ask for your password, OTP, private keys, or seed phrase.

Do Not Keep Everything on an Exchange

For larger amounts, many people move their crypto to their own secure wallet, so they are not entirely dependent on one platform. An exchange account is convenient for trading, but it leaves your funds under someone else’s control. Decide in advance how much you are comfortable leaving on a platform.

Understand the Risks

Crypto prices are highly volatile, and no exchange can remove that risk. The platform simply gives you access to the market rather than protecting you from it. Only invest money you can afford to lose.

Crypto Exchange Rules and Tax in India

Crypto is not banned in India, and buying and selling it is legal. It is not legal tender, however, and there is no dedicated regulator for the sector beyond the anti-money-laundering framework. For most people, the safest choice is a centralized exchange registered with FIU-IND, which operates under that framework with identity checks (KYC), transaction monitoring, and reporting obligations. These exchanges usually let you deposit and withdraw in rupees.

On tax, crypto is treated as a Virtual Digital Asset (VDA). Profit on a sale is taxed at a flat 30 percent, plus a 4 percent cess and any applicable surcharge, and losses cannot be set off or carried forward. A 1 percent TDS applies on transfers, deducted at source and claimed as credit against your final bill. Keeping good records of every trade makes tax time considerably easier.

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