UPDATE (26th February 16:26 GMT): Bitstamp has announced it will implement a new fee structure on 2nd March.

Whether you fancy trying your hand at trading the digital currency for the first time, or want to use it as an easy, cheap and fast method of payment, you're going to have to buy some bitcoin.

That will likely mean using one of the many online exchange and trading platforms that are vying for your custom. But how much do these companies charge to swap dollars for bitcoin? And how do the various services compare?

CoinDesk looked at seven of the biggest USD bitcoin exchanges/trading platforms to find out just that.

We started off with an imaginary buyer, Alice, who wants $1,000-worth of bitcoin.

After compiling the data on the fees of all seven platforms, we put together this comparative chart showing the fees typically incurred by a $1,000 transaction.

As can be seen, for buyers that incur the maximum 0.5% fee, ItBit proved to be the most expensive out of all the exchanges surveyed. It was closely followed by Bitstamp. Bitfinex, BTC-e and OKCoin were all considerably cheaper, while Coinbase and LocalBitcoins were free.

It should be noted that Coinbase plans to charge a fee from 1st April, however.

This bitcoin trading platform is currently available in beta and is owned and operated by iFinex Inc.

The platform, which is being prepared to operate under a fully licensed model, offers three main functions with three different types of wallets that work together.

At the time of press, the exchange had a trading volume of 1,557,657 BTC for the last 30 days.

Users are able to trade bitcoins by placing a buy or sell offer in the Bitfinex orderbook. The order will then be executed once it is matched against an appropriate offer. The exchange wallet is used for this feature.

Fees are up to a maximum of 0.2%, depending on the order type and amount.

Bitfinex

's margin trading feature allows users to borrow funds from peer liquidity providers to trade bitcoins. Traders must note that they are always held responsible for the accrued interest, at the rate in effect for the loan(s) involved in each position they take.

The liquidity feature works in conjunction with the margin trading feature, but offers safer investments to non-traders, by allowing them to use their deposit wallets to provide liquidity in the form of bitcoins and/or dollars.

Alistair Milne

, an Altana Wealth portfolio manager, said:

Arthur Hayes BitMEX co-founder and CEO, said: "Bitfinex is my preferred spot exchange because they are the most liquid globally for bitcoin/USD."

The Bitstamp exchange, which is run by prominent bitcoiner and CEO Nejc Kodrič, was originally set up in Slovenia, but shifted its operations to the UK two years ago.

The  was founded as an European-focused alternative to the then-dominant exchange Mt Gox, which has since collapsed.

Bitstamp

had the third largest trading volume at press time (504,328 BTC).

Milne said:

The exchange also asks its users to note its policy regarding fee calculation.

It states:

The exchange was hacked earlier this year, resulting in the loss of approximately $5.1m-worth of bitcoin. It has since said it will reimburse users who lost funds.

The popular and secretive European exchange, rumoured to be based out of Bulgaria, is one of the largest bitcoin and cryptocurrency exchanges.

Milne said:

Users who trade less than 500 BTC, are subject to a 0.20% fee.

The platform also offers percent allocation management module (PAAM) accounts, effectively allowing site traders to become money managers for other users, and enabling them to follow a trading strategy.

The exchange suffered a powerful distributed denial of service (DD0S) attack against its servers in April last year.

San Francisco-based Coinbase is a bitcoin wallet provider, as well as an exchange service. It was founded by Brian Armstrong and Fred Ehrsam.

Coinbase

users are able to buy and sell bitcoin at the current market rate with bank transfers both in the United States and 18 European countries.

Credit cards are supported for some users.

The company aims to make the process easier for non-technical customers to send and receive bitcoin payments by offering a user-friendly wallet service (online and app) for storing, sending and receiving bitcoin, along with merchant services that enable businesses to accept bitcoin payments online and fee-free payments between Coinbase accounts.

A Coinbase spokesperson said:

The bitcoin exchange, co-founded by CEO Charles Cascarilla, an early bitcoin adopter with more than 15 years of experience in financial services, opened its first office in 2012.

In November 2013, the exchange expanded globally and now has offices in two key global financial markets, New York (HQ) and Singapore, and employs 32 people.

The platform has an average daily trading volume of 2,000 - 3,000 bitcoin and accounts for 5-8% of the global market share.

There are two possible scenarios in terms of transaction fees, which would depend on the trader's intentions and the current market price.

In this instance, there would be a $5 charge if the trader places a bid at or higher than the current offer price. However, the trader would actually receive a $1 credit if he or she placed a bid lower than the current offer price.

If this is not the only trade that the trader makes within a 30 day period, the fees could decrease (or the rebate could increase), if the trader's overall trading volume was higher than this one single trade.

Fees are up to a maximum of 0.5%, depending on the order type and other factors.

Founded by Jeremias Kangas, a programmer and entrepreneur, this Finland-based company is a peer-to-peer marketplace, rather than a trading platform or exchange. The service matches users wanting to buy or sell bitcoin and had a trading volume of 65,760 at press time.

Bitcoins are stored in the LocalBitcoins web wallet, for which there are fees ("0.0001-0.0004 BTC per outgoing transfer").

Trades are conducted without fee. However, prices are set by the sellers and may be above or below the going market rate.

LocalBitcoins was hacked earlier this year, resulting in the distribution of malware and a loss of some customer funds.

This is not the first time that the marketplace has experienced security-related problems, including an incident last year when a hacker gained access to its servers for a brief period of time. Despite this, LocalBitcoins said that no customer data had been lost.

OKCoin is a digital currency trading platform and exchange based in Beijing.

It was founded in June 2013, and by 2014 it had grown to become the largest bitcoin exchange in China.

Fees are up to a maximum of 0.2%, depending on the order type.

Additionally, OKCoin has a minimum withdrawal amount of $15 and all withdrawals are subject to a 0.1% fee. Individuals are allowed to withdraw a maximum of $50,000 at a time.

Emily Shanahan, international marketing manager, said:

"We do not charge any deposit fees, other fees that are applicable are merely bank fees. In both cases, both charges are borne by the customer."

OKCoin's chief technical officer Changpeng Zhao recently announced his departure from the company, citing a difference of direction as the impetus for his decision.

Correction: The X axis on the graph has been modified to say "maximum purchase fee" instead of "withdrawal fees". The article previously stated that ItBit was the most expensive out of the exchanges surveyed. This has now been amended to specify that for buyers that incur the maximum 0.5% fee, ItBit is the most expensive. The text now also specifies ItBit's maker-taker model.