Draft:CEX.io

CEX.io
Company type
Private company
IndustryCryptocurrency exchange / financial technology
HeadquartersLondon, United Kingdom
Area served
Worldwide
ProductsCryptocurrency exchange services
ServicesCrypto trading, brokerage services, institutional crypto services

CEX.IO is a centralized cryptocurrency exchange founded in 2013.[1] The company provides services for buying, selling, and exchanging digital assets, operating through registered entities in the United States, the United Kingdom, and the European Union. The CEX.IO platform became known for its associated mining pool, GHash.IO, which in 2014 was close to controlling over 50% of the Bitcoin network's computing power.[2] Provide access to more than 140 different cryptocurrencies.[3]

History

CEX.IO Ltd was incorporated in the United Kingdom on 1 November 2013.[4] Initially, its activities were closely linked to the mining pool GHash.IO, which in 2014 controlled between 40 and 51% of the total computing power of the Bitcoin network. The events surrounding GHash.IO were widely covered in the international media, including The Guardian, Ars Technica and CoinDesk, which reported that the pool, operated by the CEX.IO exchange, temporarily exceeded 51% of the Bitcoin network hashrate.[5][6][7][8]

In January 2015, the company announced that it would suspend its cloud mining services, citing market conditions and reduced profitability. Over the following months, mining activities associated with the platform were gradually wound down, and the GHash.IO pool was later discontinued. As mining was phased out, CEX.IO increasingly concentrated on its exchange platform, expanding trading features and maintaining support for fiat currency transactions. By the second half of the 2010s, exchange services had become the company's primary area of activity, replacing mining as the central focus of its operations.[9]

In December 2017, CEX.IO temporarily suspended new user registrations following a surge in sign-ups that placed pressure on its account verification and onboarding systems.[10]

In August 2019, CEX.IO reported that it had begun expanding its operations in the United States. At the time, the company stated that its services would be made available to users in a large number of U.S. states. It also indicated that its activities in the country were being organized in accordance with applicable local regulatory requirements.[11][12]

In 2021 CEX.IO has expanded its services into the fintech and payments sector through a partnership with Fidelity National Information Services (FIS), aimed at enabling cryptocurrency-based payment solutions, including card-based transactions in Europe and the United Kingdom.[13]

In October 2023, CEX.IO suspended its operations in the United Kingdom after new regulatory rules were introduced by the Financial Conduct Authority (FCA). The suspension lasted for several months. In September 2024, the company resumed providing services to UK users. The relaunch followed a period of internal adjustments to the platform and operational setup, including changes intended to meet FCA requirements and the use of authorized partners where necessary.[14][15][16][17]

In 2024, CEX.IO resumed providing services to users in the United Kingdom. This took place under the Financial Conduct Authority (FCA) financial promotions regime and involved cooperation with an authorised partner, Gateway 21. The arrangement allowed the company to restore access to parts of its platform for UK-based users.[18][19][20]

The GHash.io (CEX.IO) 51% Hashrate Controversy (2014)

In June 2014, the Bitcoin mining pool GHash.io, operated by CEX.IO, temporarily exceeded 50% of the total Bitcoin network hashrate.[21] That figure is widely treated as a critical threshold because majority computational control makes a so-called “51% attack” theoretically possible.[22] In such a situation, the controlling entity could influence block selection, reorganize recent blocks, and attempt double spending by extending a competing chain.[23]

Multiple international outlets reported on the development, including Bloomberg, The Wall Street Journal, and The Guardian.[21] None of the reports documented a confirmed attack or verified transaction manipulation by the pool.[23] The concern centered on the scale of concentration rather than on demonstrated abuse.[24]

Public reaction followed quickly. Some miners began redirecting their hash power away from GHash.io.[25] In July 2014, GHash.io and its parent company CEX.IO announced that the pool would voluntarily limit its share of the total Bitcoin hashrate to roughly 40%.[24] The Bitcoin protocol itself imposed no such restriction.[26] The decision was presented as a voluntary measure intended to reduce tension around the issue.[27]

During the same period, Bitcoin's market price declined. PCWorld reported that the price dropped from approximately $653 to about $600 during the week of heightened concern. Commentators associated the decline with fears of mining centralization.[28] A Bloomberg View column addressed the episode from a different angle. The author argued that the situation highlighted reliance on voluntary conduct by large participants.[26] The resolution depended on miners leaving the CEX.IO-operated pool and on the company's decision to limit its share.[25]

Reports from CCN mentioned that GHash.io experienced technical disruptions, including possible DDoS-related interruptions, during the period of controversy. The articles did not establish a confirmed causal connection between those disruptions and the hashrate debate.[29]

By mid-2015, the distribution of mining power had changed. Business Insider published a ranking of mining pools showing that no single pool held a majority comparable to GHash.io June 2014 peak. GHash.io share had fallen below 2% of the network.[30]

In subsequent reports, CCN noted that CEX.IO scaled back and eventually discontinued the GHash.io mining pool and eventually discontinued its mining operations. The associated company, CEX.io, continued to operate as a cryptocurrency exchange after reducing its involvement in mining.[31]

Security incidents

The company has not experienced any major hacks or user losses, but in 2014, the GHash.IO incident sparked a global debate about the centralization of mining. The exchange officially called on the community to decentralize power, acknowledging the risks to the Bitcoin ecosystem.[32]

Controversies

CEX.IO has faced several controversies over the years. In February 2023, the US Federal Deposit Insurance Corporation (FDIC) issued a notice to CEX.IO Corp demanding the company stop claiming that user funds were FDIC insured, labeling such claims as false or misleading. In October 2025, the Financial Intelligence Unit of India (FIU) included CEX.IO in a list of 25 foreign crypto platforms undergoing anti-money laundering compliance checks. The company responded by stating it was reviewing the situation and preparing to engage with regulators to ensure compliance and maintain service availability in India.[33][34]

In October 2025, the Financial Intelligence Unit of India (FIU) included CEX.IO in the list of 25 foreign crypto platforms for which an anti-money laundering compliance check was initiated(AML).[35]

Beyond regulatory scrutiny, user experiences shared on public forums such as Reddit reveal a mixed picture. Some users report difficulties with account verification, withdrawal delays, and unexpected fees, including security-related charges. Others have expressed frustration over customer support responsiveness and account freezes. Despite these issues, some users acknowledge the platform's ease of use and broad cryptocurrency selection. These varied experiences highlight ongoing challenges faced by CEX.IO in balancing regulatory compliance and customer satisfaction.[36]

Awards

CEX.IO was included in the lists of leading crypto exchanges according to analytical aggregators and receiving consistently high ratings for security and user trust.[37][38]

See also

References

  1. ^ "CEX.IO Review". Investopedia. Retrieved 2026-02-27.
  2. ^ Ghash.io: We Will Never Launch a 51% Attack Against Bitcoin, 2024-04-10
  3. ^ "CEX.IO review 2023". January 30, 2023.
  4. ^ "CEX.IO LTD overview - Find and update company information - GOV.UK". find-and-update.company-information.service.gov.uk. Retrieved 2026-02-01.
  5. ^ Hern, Alex (2014-06-16). "Bitcoin currency could have been destroyed by '51%' attack". The Guardian. ISSN 0261-3077. Retrieved 2026-02-01.
  6. ^ "Ghash.io: We Will Never Launch a 51% Attack Against Bitcoin". www.coindesk.com. Retrieved 2026-02-01.
  7. ^ "Did Ukrainians Almost Take Over Bitcoin?". Bloomberg.com. Archived from the original on 2023-12-17. Retrieved 2026-03-17.
  8. ^ "Cryptocurrency and the Myth of the Trustless Transaction". repository.law.umich.edu. 2018. Retrieved 2026-03-17.
  9. ^ "CEX.io Halts Cloud Mining Service Due to Low Bitcoin Price". www.coindesk.com. Retrieved 2026-02-01.
  10. ^ Chaparro, Frank. "Some of the biggest crypto exchanges are shutting out new users because they can't keep up with demand". Business Insider. Retrieved 2026-02-27.
  11. ^ "Crypto Exchange CEX.IO Expands US Service to Cover 31 States". www.coindesk.com. Retrieved 2026-02-01.
  12. ^ "CEX.IO is Going Legit in the US, Secures MTL Licence". Financial and Business News | Finance Magnates. 2019-07-03. Retrieved 2026-03-17.
  13. ^ "Payments giant FIS makes another crypto move, expanding in Europe | Payments Dive". www.paymentsdive.com. Retrieved 2026-03-17.
  14. ^ "CEX.IO resumes operations in UK after 10-month suspension". 2024-09-12. Retrieved 2026-02-09.
  15. ^ Hunt, James. "CEX.IO becomes latest crypto firm to resume UK operations after meeting FCA guidelines". The Block. Retrieved 2026-02-09.
  16. ^ "CEX.IO Resumes UK Operations After Meeting FCA Compliance Requirements". Retrieved 4 February 2026.
  17. ^ "Cointelegraph: Bitcoin, Ethereum, Crypto News & Price Indexes". cointelegraph.com. Retrieved 2026-02-09.
  18. ^ "CEX.IO resumes UK operations, backs stricter crypto rules". Cointelegraph. 2024-09-12. Retrieved 2026-02-01.
  19. ^ Hunt, James. "CEX.IO becomes latest crypto firm to resume UK operations after meeting FCA guidelines". The Block. Retrieved 2026-03-17.
  20. ^ Adebajo, Mayowa (2024-09-12). "CEX.IO Resumes UK Crypto Operations after Meeting FCA Requirements". Coinspeaker. Retrieved 2026-03-17.
  21. ^ a b "Is One Bitcoin Miner Controlling the Entire System?". www.bloomberg.com. June 16, 2014.
  22. ^ Casey, Michael J.; Vigna, Paul (2014-06-16). "BitBeat: Mining Pool Rejects Short-Term Fixes To Avert "51% Attack"". Wall Street Journal. ISSN 0099-9660. Retrieved 2026-03-11.
  23. ^ a b Hern, Alex (2014-06-16). "Bitcoin currency could have been destroyed by '51%' attack". The Guardian. ISSN 0261-3077. Retrieved 2026-03-11.
  24. ^ a b Farivar, Cyrus (2014-07-16). "Bitcoin pool GHash.io commits to 40% hashrate limit after its 51% breach". Ars Technica. Retrieved 2026-03-11.
  25. ^ a b Wilhelm, Alex (2014-07-16). "Popular Bitcoin Mining Pool Promises To Restrict Its Compute Power To Prevent Feared '51%' Fiasco". TechCrunch. Retrieved 2026-03-11.
  26. ^ a b "Trust Will Kill Bitcoin". bloomberg.com. July 17, 2014.
  27. ^ Cuthbertson, Anthony (2014-07-17). "Cryptocurrency News Round-Up: App Teaches Bitcoin to Children & GHash Commits to 40% Hashrate". International Business Times UK. Retrieved 2026-03-11.
  28. ^ "One group controls 51 percent of Bitcoin mining, threatening security sanctity". PCWorld. Retrieved 2026-03-11.
  29. ^ Quentson, Andrew (2014-06-14). "Bitcoin Mining Pool Ghash.io DDos-ed in Response to threat of 51% attack?". CCN.com. Retrieved 2026-03-11.
  30. ^ Price, Rob. "The 21 companies that control bitcoin". Business Insider. Retrieved 2026-03-11.
  31. ^ Madore, P. H. (2015-11-19). "Ghash / CEX Scaling Back Mining Pool". CCN.com. Retrieved 2026-03-11.
  32. ^ "CoinReport GHash.io calls for dialog on 51% threat - CoinReport". coinreport.net. 2014-06-17. Retrieved 2026-02-01.
  33. ^ "CEX.IO Review 2026- Fees, Features and Security Measures". 99Bitcoins. Retrieved 2026-02-01.
  34. ^ "FDIC Demands Four Entities Cease Making False or Misleading Representations about Deposit Insurance — FDIC.gov". www.fdic.gov. Retrieved 2026-02-01.
  35. ^ Singh, Jagmeet (2025-10-02). "India cracks down on 25 crypto exchanges including BingX, LBank, CoinW over compliance failures". TechCrunch. Retrieved 2026-02-09.
  36. ^ "Reddit - The heart of the internet". www.reddit.com. Retrieved 2026-02-01.
  37. ^ CEX.IO. "CEX.IO Secures the Third Spot Among the Safest Cryptocurrency Exchanges". www.prnewswire.com. Retrieved 2026-02-09.
  38. ^ "Cryptocurrency Reports and Research | CoinDesk Data". data.coindesk.com. Retrieved 2026-02-09.

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