The volume of over-the-counter crypto transactions grew by 106% in 2024, and the daily turnover of institutional OTC operations reached approximately $39 billion. For the owner of a crypto exchange service or a platform operator, this is not just statistics: it is a signal that large clients are increasingly looking for a channel beyond the standard order book. Below, we will examine how OTC liquidity in cryptocurrencies works, in which situations it is critical, and how to avoid losing money to slippage. oaicite:0

Why standard exchange liquidity is not always sufficient

An exchange order book works on the auction principle: buyers and sellers place limit orders, and the exchange matches them. For orders of $500–5,000, this is more than sufficient. The problem arises when volume increases.

An order of $200,000 in a pair with a shallow order book “eats through” several price levels within seconds. The price moves against the trader, and the actual rate differs from the expected one. The thinner the order book, the more expensive each large operation becomes. According to Sei Network, total losses from slippage in the crypto market in 2024 amounted to about $2.7 billion.

For an exchange service, this is a double problem: the client sees one rate on the interface, while execution on the exchange happens at another. The difference falls either on the operator’s margin or on the client’s wallet. Reputational and financial damage grow linearly with the size of the transaction.

What OTC liquidity is and how it works

What OTC liquidity is — it is the ability to buy or sell a large volume of cryptocurrency directly, outside the public exchange order book, at a pre-agreed price. The abbreviation OTC stands for over-the-counter: literally “over the counter,” meaning a transaction between two parties without an intermediary in the form of an exchange engine.

The key difference from an exchange: the price is fixed before execution. The buyer knows how much they will pay for 50 BTC before pressing the button. An exchange cannot provide such a guarantee: the order book is live, changing every millisecond, and between sending the order and its execution the price may already shift. For amounts above $50,000, this difference becomes noticeable.

How liquidity is formed in OTC

OTC providers collect liquidity from several sources: their own reserves, market maker pools, and order aggregation from several exchanges. When a client requests a quote, how an OTC desk works: it queries available liquidity providers, forms the final price taking into account the spread and volume, and then offers the client a fixed rate.

Major market makers such as Wintermute recorded a 313% increase in OTC turnover in 2024. In November 2024, the one-day spot OTC trading volume of Wintermute reached a record $2.24 billion. This shows the scale: liquidity in the OTC segment is already comparable to individual exchanges.

When OTC liquidity is needed

When OTC liquidity is needed — the list of situations is quite specific:

• A transaction of $50,000 and above in one direction. On the order book of a mid-sized exchange, this already creates noticeable price impact.
• Conversion between stablecoins and fiat for business settlements. Corporate treasuries use OTC to avoid moving the market.
• Exiting a position of a large miner or fund. Selling 500+ BTC on an exchange will collapse the local price; OTC allows this to be done quietly.
• Exotic pairs: USDT/UAH, BTC/GEL, LTC/KZT. The order book on an exchange may be completely empty, while an OTC provider will assemble a quote.

According to Finery Markets, in 2025 stablecoins accounted for 78% of all OTC trades, whereas two years earlier their share was only 26%. Over-the-counter trading is becoming a standard channel for corporate settlements.

Slippage: the main hidden enemy

Slippage is the difference between the price you see on the screen and the price at which the order is actually executed. On liquid pairs such as BTC/USDT on Binance, for small orders it is 0.01–0.05%. But once the volume increases to $100,000+, the situation changes.

According to Phemex, active traders lose 1–3% per year due to slippage based on their volume of operations. For an exchange service that processes hundreds of operations daily, these are direct margin losses that accumulate unnoticed. During flash-crash situations, slippage reaches 5–10% and above: market makers remove orders from the order book, liquidity evaporates within seconds, and market orders are executed at prices far from expected.

Slippage cannot be completely eliminated on an exchange. It can only be reduced: limit orders, splitting volume into parts via TWAP algorithms, trading during peak liquidity hours (12:00–16:00 UTC). But for amounts from $100,000, these methods only smooth the problem without solving it.

How OTC solves the liquidity problem

The mechanism is simple: instead of placing a market order into the order book, the client receives a fixed quote from an OTC provider. The quote is valid for a limited time: usually 10–60 seconds. If the client confirms, the transaction is executed at this price in full, without partial filling.

The market does not learn about the transaction until it is completed, so the price impact is zero. For an exchange service, this means predictable margin: the spread is fixed, there are no unexpected losses due to slippage, and the client receives exactly the rate they saw at confirmation.

How an OTC transaction takes place

The typical process looks like this:

1. The client sends a request: asset, volume, direction (buy or sell).
2. The OTC desk forms a quote by querying liquidity providers.
3. The client confirms the price within a fixed window.
4. Both parties perform settlement: cryptocurrency is sent to a wallet, fiat to an account (or vice versa).
5. Confirmation in the blockchain / banking system completes the transaction.

Time: from 5 minutes for crypto-to-crypto to several hours if a bank transfer is involved.

Comparison: exchange vs OTC vs P2P

Risks of OTC transactions and how to avoid them

Counterparty risk is the main threat. If an OTC desk does not use escrow or custodial storage, one of the parties may fail to fulfill obligations after receiving funds. Check the presence of an escrow mechanism, the provider’s reputation, transaction history, and jurisdiction of registration.

Regulatory risk should not be ignored. In the European Union, under the rules of MiCA, virtual asset service providers (VASPs) are subject to strict AML/KYC requirements. An OTC desk without a license may become a channel for “dirty” funds, and the client may face consequences during checks of their own bank account. FATF has extended AML/CFT standards to virtual assets, including the travel rule for transfers above the established threshold.

Exchange rate risk is minimized by a short quote window: the shorter the confirmation time, the lower the risk. Avoid providers that “hold” a quote for hours without obligations.

How to understand that you already need OTC

Several indicators:

• The average ticket size of your exchange service exceeds $10,000, and you observe complaints about execution rates.
• You work with corporate clients who require a fixed price for accounting.
• Your liquidity provider does not cover the required volumes, and you compensate the difference from your margin.
• Clients move to competitors that offer more stable rates for large amounts.

The BoxExchanger platform allows exchange service operators to integrate OTC liquidity channels in order to offer clients fixed quotes for large amounts without manual negotiation.

How to choose a service for OTC operations

Selection criteria:

• Liquidity depth: the provider must cover required volumes without involving third parties in real time.
• Quotation speed: the market standard is a response within 10–30 seconds.
• Pair support: if your exchange service works with exotic directions, the provider must support them.
• API availability: for automation of quotations and settlements.
• Legal transparency: licenses, AML procedures, transparent jurisdiction.
• Escrow: a mechanism for locking funds until the transaction is completed.

Conclusion

Over-the-counter cryptocurrency trading has ceased to be a tool for the selected few: with daily OTC turnover in the tens of billions of dollars, it is already standard market infrastructure. For an exchange service operator, integrating an OTC channel means retaining large clients, ensuring predictable margins, and gaining a competitive advantage over platforms that still process large volumes through the exchange order book.