Nils Silinevics
Partner · AML & Crypto Compliance · Former FIU Investigator
You've seen your deposit held pending review without explanation on CEX.IO. CEX.IO, headquartered in United Kingdom (registered with FCA), is regulated by UK Financial Conduct Authority (FCA) under UK Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017. The exchange uses Chainalysis for blockchain analytics and Onfido for identity verification. CEX.IO is one of the few exchanges FCA-registered as a crypto-asset business in the UK. This means they're subject to UK MLR 2017 — one of the strictest AML regimes — but also means they follow due process more rigorously than offshore exchanges. CEX.IO freezes accounts under UK Money Laundering Regulations when their compliance team detects sanctions matches, high-risk deposits, or unusual withdrawal patterns. You send crypto to your deposit address, but it doesn't appear in your account. Or you initiate a bank transfer, and the platform refuses to credit it. You may receive a notification that the deposit is under review, or you may hear nothing at all.
CEX.IO freezes accounts under UK Money Laundering Regulations when their compliance team detects sanctions matches, high-risk deposits, or unusual withdrawal patterns. CEX.IO is one of the few exchanges FCA-registered as a crypto-asset business in the UK. This means they're subject to UK MLR 2017 — one of the strictest AML regimes — but also means they follow due process more rigorously than offshore exchanges. This background matters because it shapes how CEX.IO handles compliance — and how we approach resolving your case.
The compliance framework: CEX.IO operates under UK Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017, overseen by UK Financial Conduct Authority (FCA). Their compliance infrastructure uses Chainalysis for blockchain analytics and Onfido for identity verification. CEX.IO is known for fiat onboarding and card purchases for beginners, serving entry-level crypto users in Europe and UK — and their compliance team is calibrated to flag deviations from typical user behavior in that segment.
What triggers deposit rejected on CEX.IO:
Real case — FCA regulation: A UK-based user had €30,000 frozen on CEX.IO after making a large withdrawal to a new bank account. CEX.IO's compliance team requested source of funds documentation but the user's funds originated from crypto mining 5 years ago — he no longer had the mining records. We reconstructed the mining history from blockchain evidence (pool payouts, hardware purchase receipts) and CEX.IO released the funds within 8 days.
What CEX.IO requires to resolve this: Depending on the trigger, CEX.IO may ask for government-issued photo ID (verified through Onfido), proof of address (utility bill or bank statement within 3 months), crypto withdrawal blocks (exchange statements, bank records, payslips, tax returns, or business documents), detailed transaction explanations with on-chain evidence, and in some cases a video verification interview. The challenge: CEX.IO rarely tells you which specific trigger caused the deposit rejected, so you're guessing at what documentation to provide — and each rejected submission makes the next one harder.
Our approach is specific to CEX.IO: CEX.IO's FCA registration means they follow UK regulatory procedures — including the right to appeal compliance decisions. We use the FCA's complaints framework to escalate unreasonable freezes. CEX.IO is more responsive to legal pressure than offshore exchanges because their FCA registration is commercially critical and they can't afford regulatory complaints.
Deposit Rejected on CEX.IO — our strategy: We trace the deposit on-chain (for crypto) or through banking records (for fiat), identify why the platform flagged it, and prepare documentation that demonstrates the legitimate origin of the funds and clears the deposit for crediting.
The submission that matters: Instead of submitting through CEX.IO's standard support channels (where you'll get automated responses or generic template replies), we prepare a professional legal submission — a structured compliance package with a cover letter from a Swiss law firm citing UK Financial Conduct Authority (FCA) obligations and UK Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017. CEX.IO's compliance team processes legal submissions differently from regular user tickets — they're assigned to senior compliance officers, not support agents, and they bypass the automated response loop that delays most cases by weeks.
Was this triggered by a hack or scam? If your CEX.IO account was frozen after unauthorized access, a phishing attack, or a SIM swap, the freeze may be a secondary consequence. Our crypto fraud recovery practice can trace stolen assets through on-chain analysis while we simultaneously work to unfreeze your account — the two processes are complementary, not sequential.
When standard compliance isn't enough: Some situations fall outside the normal compliance flow — inherited crypto holdings, accounts registered under another person's name, unprovable source of funds through conventional documentation, or cross-jurisdictional complications where your residence, the exchange's jurisdiction, and the fiat banking path all differ. If that sounds like your case, our complex cases practice handles scenarios that other firms decline.
Further reading: our guide on what to do when a crypto exchange freezes your account covers the documentation and legal strategy in more depth.
We trace the rejected deposit on-chain (for crypto) or through banking records (for fiat). Crypto deposits are rejected when {compliance_tool} flags the sending address; fiat deposits are rejected by banking partners.
For crypto: we prepare on-chain evidence showing the legitimate origin of the sending address, transaction history, and exchange records. For fiat: we prepare bank statements and transfer documentation.
We submit a formal appeal to {p_name}'s compliance team with a legal cover letter citing {aml_law}. Our appeal includes transaction tracing, source proof, and a narrative explaining the legitimate origin of the deposit.
Deposit credited to your {p_name} account — or returned to the source if {p_name} refuses. We advise on deposit patterns that trigger rejections and how to pre-clear large deposits.
FCA registration means CEX.IO follows UK MLR 2017 procedures, but it doesn't prevent them from freezing accounts they deem high-risk. What it does mean is that they must follow due process: provide reasons for the freeze, allow you to respond, and make a timely decision. If CEX.IO freezes your account without explanation or drags the review out for months, they're violating FCA expectations — and we can escalate to the FCA complaints system.
CEX.IO is FCA-registered; Binance's UK entity (Binance Markets Limited) has had a more complex regulatory journey. CEX.IO is fully compliant with UK MLR 2017 and has a dedicated UK compliance team. This means freezes are more predictable (they follow UK regulatory procedures) but also more stubborn — CEX.IO's compliance team won't unfreeze an account without proper documentation because they face FCA scrutiny.
Crypto deposits are screened by blockchain analytics before being credited. If the sending address has a high risk score — associated with mixers, darknet markets, sanctioned entities, or known scam addresses — the platform may hold or reject the deposit. Even if you bought the crypto legitimately on another exchange, the address history matters. We trace the chain and document the legitimate acquisition.
Fiat deposit rejections happen when: your bank's country is restricted, the sender name doesn't match your platform account, the payment reference includes suspicious text, or the banking partner flagged the transfer. Card deposits can be rejected by the card issuer's fraud detection system, not the platform itself. We identify whether the block is on the platform's side or the banking side.
For crypto: the funds may be held in the platform's wallet (not credited to your account) or returned to the sender address. For fiat: the bank transfer may be reversed and returned to your bank. In both cases, your funds aren't lost — but they're inaccessible. We help recover held deposits by providing the documentation needed to credit them.
Tell us what happened — which crypto, which network, what error message. We respond within 6 hours.