How to Add OTC Trading to Your Crypto Exchange

Table of Contents

• Why OTC Matters More Than You Think
• How OTC Trading Actually Works
• The Revenue Model: What OTC Desks Actually Earn
• Settlement and Custody: Where OTC Gets Complicated
• Institutional Client Onboarding for OTC
• Liquidity Sourcing for Block Trades
• Building the Tech: RFQ Engine, Chat, and Settlement
• Compliance for OTC
• Marketing Your OTC Desk to Institutions
• Build vs Partner: When to White-Label an OTC Solution

Why OTC Matters More Than You Think

Here’s a number that should change how you think about your exchange business: an estimated 65-70% of institutional crypto volume doesn’t go through order books. It goes through OTC desks.

That’s not a rounding error. That’s the majority of serious money in crypto trading happening off your platform entirely.

When a fund wants to buy $5M in Bitcoin, they don’t place a market order on Binance. The slippage alone would cost them 1-3% — that’s $50K-$150K in execution cost on a single trade. Instead, they call an OTC desk, get a fixed quote, agree on terms, and settle bilaterally. No slippage. No market impact. No information leakage.

The big names in crypto OTC — Cumberland (a DRW subsidiary), Circle Trade, Galaxy Digital, B2C2 — do billions in monthly volume. But here’s the thing: they don’t have a monopoly. Mid-size exchanges are increasingly adding OTC desks and capturing a meaningful share of block trade flow, especially in their home markets.

Why? Because institutions want OTC counterparties they already have a relationship with. If a fund is already KYC’d on your exchange platform and has assets custodied with you, adding OTC is a natural extension. You already have their trust. You already hold their assets. You just need to offer them a different way to trade.

We’ve seen exchanges add OTC desks and increase their total revenue by 15-30% within the first year. For many, OTC becomes the highest-margin product they offer.

How OTC Trading Actually Works

OTC isn’t one thing. There are three distinct models, and which one you choose depends on your capitalization, risk tolerance, and client base.

1. Principal trading (risk model)

You trade against the client using your own capital. Client asks for a price on 100 BTC. You quote $67,450 per coin. Client accepts. You now need to acquire 100 BTC (or already hold it in inventory) and deliver it.

The upside: biggest margins. You’re earning the spread between your quote and your cost basis. On a $6.7M trade, a 50-basis-point spread is $33,500 in gross profit.

The downside: you’re taking market risk. If BTC drops 2% between when you quote and when you fill your hedge, you’ve just lost $134K. Principal trading requires capital, hedging discipline, and a strong stomach.

2. Agency model (riskless)

You act as a broker. Client asks for a price, you source it from your liquidity network (other exchanges, market makers, other OTC desks), add your commission, and pass it through.

Lower margins — typically 10-25 basis points versus 30-75 for principal. But zero market risk. You make money on every trade regardless of direction.

For most exchanges starting their OTC business, agency is the right first step. You don’t need a trading book or risk management infrastructure. You just need connections and a good liquidity engine.

3. Request-for-quote (RFQ) marketplace

You build a platform where multiple market makers compete to fill client orders. The client submits an RFQ, three or four liquidity providers respond with quotes, the client picks the best one, and you charge a platform fee.

The margins are thinnest (5-15 basis points) but volume can be highest because clients love the transparency of competitive quoting. Paradigm, a crypto options and block trading platform, runs essentially an RFQ marketplace and processes billions monthly.

Which model should you start with?

Start agency. Add principal once you have enough flow to justify a trading inventory. Consider RFQ marketplace only if you have strong relationships with multiple market makers.

The Revenue Model: What OTC Desks Actually Earn

Let’s put real numbers on this.

Agency model at scale:

A mid-size OTC desk doing $50M/month in volume at 15 basis points earns $75,000/month in commission. At $200M/month (achievable within 18 months for a well-run desk), that’s $300,000/month.

Operating costs: 1-2 OTC traders ($100K-$200K/year each), compliance overhead (~$50K/year incremental), and technology ($20K-$50K in build-out costs).

Break-even on the agency model is roughly $20-30M in monthly volume. Most desks hit that within 6-9 months if they have an existing institutional client base.

Principal model at scale:

Same $200M/month in volume, but at 40 basis points average spread: $800,000/month gross. Subtract hedging costs (slippage, exchange fees for hedging trades) and you’re looking at $500-600K/month net.

But you need $2-5M in working capital for your trading inventory, plus risk management systems, and you’ll have months where hedging losses eat into or exceed your spread income.

Blended model (most common):

Run agency for most flow, take principal risk only on sizes and assets where you have a strong edge. 70% agency, 30% principal by volume is a common split. Revenue falls somewhere between the two models.

For context on how OTC revenue fits into the broader exchange business model, see our exchange revenue guide.

Settlement and Custody: Where OTC Gets Complicated

Order book trading is instant settlement — the trade matches, balances update atomically. OTC isn’t like that. You’ve agreed on a price, but now you need to actually move assets between two parties who may not trust each other yet.

The settlement options:

Pre-funded. Both sides deposit assets before the trade. You hold $5M in USDC and 75 BTC in escrow. Once both sides confirm, you execute the swap atomically. Safest approach. Most institutional clients accept it. The downside: capital is locked up during the settlement window, which could be hours.

Net settlement. If two parties trade back and forth multiple times per day, you net the results and settle the difference once daily. Reduces capital lockup but introduces counterparty risk during the netting period. Only works with trusted, long-term relationships.

Delivery-versus-payment (DvP). The gold standard. Both legs of the trade settle simultaneously. If one side doesn’t deliver, neither side’s assets move. Some custodians (Fireblocks, Copper’s ClearLoop) offer DvP infrastructure specifically for crypto OTC.

Atomic swaps. On-chain DvP using smart contracts. Both parties’ transactions are cryptographically linked — either both execute or neither does. Technically elegant, but limited to assets on the same blockchain or using cross-chain bridges.

For your exchange, the simplest starting point is pre-funded settlement using your existing wallet infrastructure. The client deposits assets to their exchange wallet. You execute the trade internally. Done. No external custody integration needed.

As you scale, integrate with an institutional custody provider (Fireblocks, BitGo, or Copper) that offers settlement networking. These platforms let you settle OTC trades across different custodians without moving assets to a common location first.

Institutional Client Onboarding for OTC

OTC clients are not retail users. Their onboarding requirements are different, and getting it wrong means losing them before the first trade.

What institutions expect:

• Entity-level KYC. Corporate documents, beneficial ownership disclosure, board resolutions authorizing trading activity, and authorized signatory lists. Your standard retail KYC flow won’t work here — you need a separate institutional onboarding process.
• Trading agreements. A signed ISDA (International Swaps and Derivatives Association) master agreement or equivalent OTC trading agreement. At minimum, you need terms covering trade confirmation, settlement obligations, default events, and dispute resolution.
• Credit assessment. Unlike retail trading where the customer pre-deposits funds, some institutional OTC involves credit exposure. You need to assess whether the counterparty can meet their settlement obligations. For pre-funded trades, this is less critical — but you should still know who you’re dealing with.
• Authorized trader lists. Institutions want to specify which individuals can request quotes and authorize trades. Maintain a list and verify identities for every interaction.

The onboarding timeline:

Expect 2-4 weeks for a straightforward institutional onboarding. Complex structures (fund of funds, multi-entity groups, cross-border setups) can take 6-8 weeks. Start the process early. Don’t lose a client to a competitor because your compliance team took too long.

A practical tip: build a separate onboarding flow for institutional clients in your admin panel. The documentation requirements, approval workflows, and risk assessments are different enough from retail that trying to use the same flow creates friction and errors.

Liquidity Sourcing for Block Trades

When a client wants to buy $10M in ETH, where does it come from?

Your own inventory. If you’re running a principal desk, you may hold inventory in major assets (BTC, ETH, USDT, USDC). Typical inventory for a mid-size desk: $2-5M across 3-5 assets.

Your exchange order book. Route the order through your own matching engine, potentially split across multiple smaller orders to minimize market impact. Best for mid-size trades ($100K-$1M). Your liquidity engine can help optimize execution here.

Other exchanges. Maintain accounts and pre-funded balances on 3-5 major exchanges. When a client order comes in, you source across venues to get the best blended price. You’ll need API integrations and fast execution — a 30-second delay on a $5M trade can cost thousands in slippage.

Market maker relationships. Establish bilateral relationships with 2-3 institutional market makers (Jump Trading, Wintermute, GSR, DWF Labs). They provide streaming quotes for large sizes and can fill block orders that are too big for public order books.

Other OTC desks. Sometimes the best liquidity for an unusual request (large-size altcoin, cross-pair block trade) comes from another OTC desk that happens to have inventory or a matching counterparty. Build a network.

The practical approach:

Start by routing client orders through your own order book and 2-3 external exchanges. Add market maker relationships in month 2-3. Add inventory and principal trading in month 4-6 once you understand your flow patterns.

Don’t try to pre-build everything. The liquidity infrastructure for OTC is something you iterate on based on actual client demand.

Building the Tech: RFQ Engine, Chat, and Settlement

The technology for OTC is simpler than you’d expect, because most OTC trading still involves human interaction.

Core components:

1. RFQ interface

A web-based interface where institutional clients submit quote requests. Fields: asset pair, size, direction (buy/sell), settlement preference, and expiry time for the quote.

Your OTC traders see incoming RFQs, price them (with the help of real-time market data and your pricing model), and send quotes back. The client accepts, rejects, or counters. Once agreed, the system generates a trade confirmation.

Build it simple. One page. No unnecessary features. The institutional clients using your OTC desk don’t want a flashy UI — they want speed and accuracy.

2. Chat/communication channel

Many OTC trades still happen over chat. Institutional clients want to negotiate, ask about market color, and discuss settlement details. Integrate a secure chat (or support communication via existing channels — many desks still use Telegram or Signal for real-time comms and then confirm via the platform).

The critical requirement: every chat message related to a trade must be logged and retrievable. Regulators expect communication records associated with OTC transactions. Archive everything.

3. Settlement engine

Handles the post-trade workflow: confirming both parties’ obligations, initiating transfers, verifying receipt, and updating balances. For pre-funded trades on your own platform, this is just an internal balance transfer with a trade confirmation record.

For external settlement (client delivers from an external wallet), you need address verification, on-chain monitoring, and confirmation tracking.

4. Reporting and risk management

Real-time position monitoring (if running principal), P&L tracking, counterparty exposure tracking, and compliance reporting.

Build timeline:

A v1 OTC module built on top of an existing exchange platform takes 6-8 weeks for a competent team. That gets you: RFQ interface, basic chat logging, pre-funded settlement, trade confirmation generation, and reporting.

Compliance for OTC

OTC compliance is different from exchange compliance in a few important ways. Don’t assume your existing compliance framework covers it.

The key differences:

Transaction reporting. Some jurisdictions require OTC trades above certain sizes to be reported separately. MiCA’s trade reporting requirements apply to OTC trades executed by CASPs. If you’re a US-registered entity, large currency transactions (over $10K equivalent) have BSA reporting requirements regardless of whether they happen on or off the order book.

Market manipulation risk. OTC trades can be used to manipulate exchange-listed prices. A trader buys a large block OTC (off-book), then waits for the market impact of the eventual hedge to push exchange prices up, and sells at the higher price. Your surveillance system needs to consider OTC flow alongside order book activity.

Information barriers. Your OTC desk knows about large pending client orders before the market does. That’s material non-public information. You need strict information barriers between your OTC desk and any proprietary trading activity, market-making operations, or listing decisions.

Enhanced KYC. OTC clients tend to trade larger sizes. Larger sizes mean higher AML risk. Most compliance frameworks require enhanced due diligence for OTC clients — more frequent reviews, deeper source-of-funds analysis, and lower thresholds for suspicious activity reporting.

Documentation requirements. Every OTC trade should have a trade confirmation signed by both parties, a record of how the price was determined, and a settlement confirmation. Verbal agreements followed by email confirmations are still common, but regulators increasingly want structured digital records.

Your compliance module needs a separate OTC workflow that captures these additional requirements.

For the broader compliance picture, our guide on crypto exchange liquidity management covers how OTC and on-book liquidity interact.

Marketing Your OTC Desk to Institutions

Institutions don’t find OTC desks through Google ads. Here’s what actually works.

1. Mine your existing user base. Pull a list of accounts with balances over $100K or monthly trading volume over $500K. These are your first OTC prospects. Reach out personally. Offer better pricing than they’d get on the order book.

2. Attend institutional events. Consensus, Token2049, and regional events like Blockchain Week in Singapore or Dubai. The hallway conversations matter more than the panels. Bring your OTC trader, not your marketing team.

3. Get listed on aggregators. Platforms like Paradigm, Caspian (now part of Galaxy), and institutional-facing data providers maintain directories of OTC counterparties. Being listed signals credibility.

4. Prime broker relationships. If institutional prime brokers (FalconX, Hidden Road) route flow to your desk, you get access to their entire client base. The economics are less favorable (they take a cut), but the volume can be significant.

5. Content and thought leadership. Publish market commentary, OTC flow analysis (anonymized), and pricing insights. Institutional traders pay attention to counterparties who demonstrate market knowledge. A weekly OTC market report — even a simple one — signals competence.

6. Direct outreach to funds. Crypto hedge funds, family offices with digital asset allocations, and corporate treasury teams are your targets. LinkedIn, industry introductions, and conference meetings are the channels. Cold outreach works but only if you lead with value (market insight, competitive pricing analysis) rather than a sales pitch.

The sales cycle for institutional OTC is long — typically 2-6 months from first contact to first trade. Budget for that. Don’t expect revenue in month one.

Build vs Partner: When to White-Label an OTC Solution

You have three options for launching OTC.

Build in-house.

Best when: you have an existing exchange platform with the infrastructure to support OTC (wallet system, KYC, compliance), plus a team that understands institutional trading.

Timeline: 6-8 weeks for v1, 3-6 months to optimize.

Cost: $30K-$80K in development, plus $100K-$200K/year in operational costs (traders, compliance).

Control: maximum. You own the client relationship, the pricing, and the margin.

White-label an OTC module.

Best when: you want to offer OTC quickly without building from scratch. Several vendors offer turnkey OTC modules that integrate with existing exchange infrastructure.

Timeline: 2-4 weeks to deploy.

Cost: Setup fee ($5K-$20K) plus revenue share (10-30% of OTC revenue).

Control: moderate. You own the client relationship but share economics with the vendor.

Partner with an existing OTC desk.

Best when: you don’t have the capital or expertise for principal trading. You refer institutional clients to a partner desk and earn a referral fee or revenue share.

Timeline: days to set up.

Cost: none upfront. Revenue share only.

Control: minimal. The partner owns the relationship after the introduction. You get a piece of revenue but no direct client access.

Our recommendation:

If you’re already running a licensed exchange with institutional clients, build in-house with agency model first. The infrastructure overlap with your existing platform is significant, and maintaining the direct client relationship is worth the extra effort.

If you’re a smaller exchange testing the waters, partner first. Learn what institutional clients actually need, build those relationships, and then decide whether to bring OTC in-house based on real demand data rather than projections.

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Sources & Further Reading

• IOSCO Consultation Report on Market Intermediaries in Crypto-Asset Markets — International Organization of Securities Commissions
• BIS Quarterly Review — Crypto Market Structure and OTC Trading — Bank for International Settlements
• FATF Guidance on Virtual Asset Transfers (Travel Rule) — Financial Action Task Force
• MiCA Regulation — Title IV: Transaction Reporting for CASPs — European Parliament
• Chainalysis OTC Broker Risk Analysis — Chainalysis