How to Calculate Crypto Profit on OTC Deals (Discount and Premium Math)

Over-the-counter (OTC) crypto desks regularly quote prices that look like free money: "buy Bitcoin at a 3% discount to spot" or "sell your altcoins at a 5% premium." For traders moving too much size for a public order book, these offers are tempting — but the headline discount is not your profit.

Your real number is what survives after fees, settlement costs, and the price move during transit. This guide walks through the full OTC profit calculation with a worked Bitcoin example, so you know what a "3% discount" is actually worth.

What an OTC Discount Really Means

An OTC desk trades blocks of coins directly with a counterparty — an institution, a miner, a whale — off the public order book. Because it takes on balance-sheet risk, it prices a few percent away from the spot price you see on CoinGecko. That spread is the desk's margin, not yours.

Your profit exists only in the gap between the discounted price you paid and the price you actually realize on exit — after taker fees, desk commissions, wire costs, and any price move during settlement. Miss one line item and the "discount" quietly becomes a loss.

The Full OTC Profit Formula

Net OTC profit = (exit price × amount − exit fees) − (OTC buy price × amount + desk fee) − settlement costs − price-move loss

Each component matters. The desk fee (typically 0.25%–1% of notional) sits on top of the discount. Settlement costs add wire or bank fees ($25–$50), on-chain network fees, and sometimes custody charges. Then the exit fees: exchange taker fees (0.05%–0.5%) and withdrawal fees.

The settlement-window risk

OTC settlement is not instant — a typical deal takes 30 minutes to a few hours. If Bitcoin drops 1% during a two-hour window, a 3% discount just became 2%, before you pay a single fee. Ask for a reference-price lock at quote time, in writing.

Worked Example: Buying 2 BTC at a 3% Discount

BTC spot is $82,726. An OTC desk offers 2 BTC at a 3% discount — $80,244 per coin, $160,488 total. You sell on a spot exchange at a 0.1% taker fee, realizing $82,643 per BTC, or $165,287 for both coins. Gross profit: $165,287 − $160,488 = $4,799 (2.99%).

Now the real costs: the desk charges 0.5% ($802) and the wire costs $50. Net profit: $3,947 — a 2.46% return on the $160,488 deployed, assuming no price move during the two-hour settlement window.

Key takeaway: A 3% OTC discount became just 2.46% net profit after desk fees, wire costs and a 0.1% taker fee — always run the full subtraction before committing capital.

How the Discount Size Changes Net Profit

The table below uses the same assumptions: spot $82,726, 2 BTC, 0.1% taker fee, 0.5% desk fee, $50 wire.

*Net of desk fee and $50 wire; assumes no price move during settlement.

At a 2% discount, fixed costs eat almost 30% of the gross — thin discounts only work at scale, the same margin math as crypto arbitrage, where fees and slippage decide whether a spread survives. And just as trading fees quietly eat into crypto profits in every strategy, OTC is no exception.

Key takeaway: Fixed costs hit small discounts hardest — at 2% off spot you keep only ~73% of the gross profit, while at 5% you keep ~90%; never judge an OTC quote by the headline percentage alone.

The Reverse: Selling OTC at a Premium

The mirror trade is selling coins to a desk above spot — common with illiquid assets, where a desk filling a large client order may pay 3–8% over spot for tokens it cannot source on an exchange. The premium is your profit, minus the same fee stack.

But premium deals carry a risk discount deals do not: counterparty and default risk. A desk paying above market is often desperate for inventory — possibly under-capitalized or operating where your legal recourse is thin. Desks that delay settlement or renegotiate mid-deal are not rare in crypto.

How to protect yourself

Stick to desks with a verifiable track record and corporate registration. Settle simultaneously (coins and cash move at the same time), split large amounts into tranches, and price the risk into your math: a 5% premium means nothing if there is a real chance you never get paid.

Before you take any OTC quote, run your trade numbers through the free crypto profit calculator — plug in the discount, fees and settlement costs to see your true net profit first.

Conclusion

OTC discounts and premiums are real, but the headline number is only the starting point. A 3% discount became 2.46% after fees — and any price move during settlement would shrink it further. Run the full formula, with every cost included, before you agree to the deal.

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Cryptocurrency trading involves substantial risk of loss. Always do your own research (DYOR) and consult a qualified financial professional before making investment decisions.