KuCoin Review: Analysis for Size Traders After the 2020 Hack Recovery

Most KuCoin reviews either skip the 2020 hack entirely or use it to dismiss the exchange. Neither framing is useful. The hack happened, users were fully reimbursed within weeks, operational security was rebuilt, and five years later KuCoin is the measured leader in $500k BTC fill reliability among the seven major exchanges we tested. This review tells both stories — what actually happened in 2020, and why the measured data now shows a different KuCoin than the one that was breached.

One number to set the stakes: KuCoin’s fill rate on $500k BTC market orders was 99.7% in our 24-hour test — the highest of any exchange measured. Bitget was second at 99.4%; Binance managed only 40%, OKX 28.6%, Bybit 1.9%, and Coinbase 0%. For traders who routinely move six-figure positions on spot, KuCoin’s book depth isn’t marketing — it’s measured. Whether you weigh that against the 2020 security history is the judgment this review is designed to help you make.

KuCoin at a Glance

A 10-second summary. KuCoin’s differentiators are measured fill reliability on size and deep altcoin listing breadth. The 2020 security history is a real factor that deserves honest consideration.

The short version: KuCoin is the measured leader for spot size execution and the broadest altcoin listing venue. The 2020 hack history is real and requires individual judgment about whether five years of clean operations after full recovery is sufficient evidence of rebuilt security.

KuCoin Is the Exchange That Got Hacked, Recovered, and Rebuilt

Founded in 2017 and based in Seychelles, KuCoin entered the offshore exchange market with a specific positioning: the widest altcoin listing selection in crypto. Where Binance curated its listings (relatively) and OKX emphasized derivatives sophistication, KuCoin leaned into asset breadth — becoming the primary venue for newer, smaller, or longer-tail tokens before they reached larger exchanges. That positioning brought meaningful market share but also brought operational risk.

On September 25, 2020, KuCoin was hacked. Attackers compromised hot wallet private keys and drained approximately $280 million in BTC, ETH, ERC-20 tokens, and other assets. It was one of the largest crypto exchange hacks in history at the time. The response matters for understanding where KuCoin is today:

• Within hours, KuCoin suspended all deposits and withdrawals, publicly disclosed the breach, and began working with law enforcement and blockchain analytics firms (Chainalysis, Elliptic) to track the stolen funds on-chain.
• Within days, KuCoin coordinated with the broader crypto industry — particularly with token projects whose contracts could blacklist addresses — to freeze stolen assets before they could be sold. This was a novel coordinated response.
• Within weeks, KuCoin announced that 84% of stolen funds had been recovered or frozen through on-chain tracking and coordination. The remaining 16% was covered by KuCoin’s insurance and treasury, and all affected users were fully reimbursed — no customer lost funds.
• By early 2021, normal operations resumed. KuCoin publicly documented the attack vector, the response timeline, and the security improvements implemented afterward (hot wallet segregation redesign, multi-sig requirements, improved key management, expanded insurance fund).

The 2020 hack was a real security failure. The response was genuinely better than most exchange breaches in crypto history — faster disclosure than Mt. Gox, more transparent than Coinrail, more complete reimbursement than QuadrigaCX (where users never recovered funds). The recovery doesn’t erase the fact that the breach happened, but it does provide evidence about how KuCoin handles worst-case scenarios.

Since September 2020 — over five years as of this writing — KuCoin has had no major successful security breaches. The operational improvements implemented after the hack (improved cold/hot wallet architecture, multi-signature controls, third-party security audits) appear to have held. Whether five years of post-hack clean operations is sufficient evidence of rebuilt security is an individual judgment, not a universal answer.

KuCoin today is the measured leader on $500k BTC fill rates (99.7% in our 24-hour test), operates one of the widest altcoin listing selections in crypto, and maintains a solid technical infrastructure for API-driven trading. The exchange is also a venue whose past matters to many users — and this review presents both without softening either.

Who KuCoin Is Actually For

Four profiles find enough value in KuCoin’s combination of measured execution quality and altcoin breadth to justify the platform despite the 2020 history.

Size traders on spot. Our $500k BTC fill test showed KuCoin absorbing 99.7% of simulated orders — the highest of any venue we measured. Binance managed 40%; OKX 28.6%; Bybit 1.9%; Coinbase 0%. For anyone routinely moving six-figure positions on spot, KuCoin’s book depth is structural: the platform maintains meaningful liquidity beyond the absolute top-of-book that allows large market orders to execute predictably. For a trader whose P&L is sensitive to fill reliability rather than just top-of-book spreads, KuCoin is the measured best.

Long-tail altcoin traders. KuCoin lists 700+ spot trading pairs — one of the widest selections in crypto. Many newer or smaller tokens list on KuCoin before (or instead of) reaching Binance or Coinbase. For traders seeking specific altcoin exposure, particularly on tokens outside the top-50 by market cap, KuCoin is often the only major venue offering the pair. This is both a feature (access to tokens unavailable elsewhere) and a risk (listing breadth includes low-quality projects that have failed). Always do your own due diligence on individual tokens regardless of listing.

Low-latency systematic traders in Asia. Our measured API latency from Tokyo showed KuCoin at 23 ms median — second fastest after Binance (18ms) and meaningfully better than OKX (94ms), Bybit (83ms), or Coinbase (209ms). For systematic strategies running from Asian infrastructure where round-trip speed matters, KuCoin’s latency is in the top tier. Combined with the depth profile, KuCoin works as a credible systematic trading venue.

Users diversifying across offshore exchanges. For traders concentrating spot volume at a single exchange, counterparty risk matters. KuCoin works as a credible secondary or tertiary venue after Binance and OKX — deep books on majors, broad altcoin coverage, low latency, reasonable fees. The security history is a factor in how much size to concentrate here, but as one of several venues, the platform is functionally competitive.

Who KuCoin Is Not For

Equally important — and rarely explained honestly in other reviews.

US residents. KuCoin does not accept US users and has explicitly restricted US access since 2023 (following an NYDFS enforcement action and subsequent settlement). Previously accepted US accounts were required to withdraw funds. US residents should use Coinbase, Kraken, or Gemini. Attempting to use KuCoin via VPN violates terms of service and risks account freezes.

Users for whom the 2020 hack is disqualifying. This is a legitimate position, not an irrational one. Some users reasonably prefer exchanges that have never been successfully breached, regardless of how well a hacked exchange responded. Kraken‘s 13-year clean record, Coinbase‘s 13-year clean record, OKX‘s clean record since 2017, and Bitget‘s clean record since 2018 all offer equivalent functional service without the 2020 security history. If hack history is a binary filter for you, KuCoin doesn’t pass. That’s a defensible choice.

Compliance-driven institutional users. KuCoin operates under Seychelles jurisdiction with limited regulatory clarity compared to Coinbase‘s public company structure or Kraken‘s US MSB status. The 2020 hack history compounds this concern — for institutional due diligence, the combination of offshore jurisdiction and breach history is usually disqualifying regardless of recovery quality.

Derivatives breadth hunters. KuCoin offers perpetual futures and margin but the product surface is narrower than Binance‘s or Bybit‘s. Options markets are thin. For active derivatives trading across multiple product types, KuCoin is secondary at best.

Real Costs at KuCoin

KuCoin’s cost structure follows the standard offshore-exchange pattern — base-tier fees match the universal 0.10% rate across Binance, OKX, Bybit, and Bitget, with tiered discounts based on 30-day volume and KCS token holdings.

Spot Trading Fees

KuCoin spot fee tiers, April 2026. Similar structure to Binance and OKX. Holding KCS provides additional 20% fee discounts via the KCS Bonus program.

At base tier, KuCoin’s 0.100% taker matches the offshore exchange cohort. Our measured round-trip cost on BTC/USDT at $10k was 20.03 bps — tied with Binance, OKX, and Bybit for the lowest of the seven venues tested. For retail spot trading on majors, KuCoin delivers the same effective cost as other offshore exchanges.

The KCS Bonus program provides an unusual structural feature: KCS holders earn a daily dividend from a portion of KuCoin’s trading fee revenue, paid in various cryptocurrencies proportional to each user’s KCS balance. The dividend is separate from the 20% fee discount. For active KCS holders, the combined benefit (fee discount + daily bonus) can be meaningful — though like all exchange token plays, it’s an implicit concentrated bet on KuCoin as a business.

Derivatives Fees

KuCoin’s futures pricing is competitive but not leading:

KuCoin perpetuals fees, April 2026. The 0.060% base-tier taker is in line with Bitget and slightly higher than Binance (0.040%) and OKX (0.050%).

For active derivatives traders, KuCoin’s fees are competitive but the product surface is narrower than Binance’s, OKX’s, or Bybit’s. For users whose primary activity is spot, derivatives fees are essentially irrelevant — the spot execution and altcoin breadth are the reasons to be here.

Withdrawal Fees

KuCoin’s withdrawal fees follow industry standard patterns:

Representative KuCoin withdrawal fees, April 2026. BTC native withdrawal fee is on the higher end among offshore exchanges.

KCS Bonus: The Daily Dividend Feature

KuCoin’s native token KCS has an unusual utility feature that deserves separate attention. KCS holders receive a daily share of KuCoin’s trading fee revenue, paid in various cryptocurrencies and distributed proportionally to each user’s KCS balance. The program is called KCS Bonus. This is different from typical exchange token mechanics where the token simply provides fee discounts.

For a user holding 1,000 KCS (roughly $10,000-15,000 at typical prices over the past two years), the KCS Bonus daily payout has historically provided approximately 2-6% annualized return — though this varies with trading volume on the exchange. Combined with the 20% fee discount on trades, the effective yield from holding KCS for active users can be meaningful.

The tradeoff is identical to other exchange tokens: large KCS holdings are implicit bets on KuCoin as a business. Token value depends on trading volume, platform growth, and exchange solvency. For users comfortable with that exposure (or whose portfolio already includes exchange tokens), KCS is a reasonable holding. For users seeking to minimize exchange-concentration risk, small positions for fee discounts only are sufficient.

Platforms: App, Web, and Pro Interface

KuCoin offers multiple access points with a design philosophy focused on altcoin discovery and trading rather than pure derivatives or DeFi integration.

KuCoin App (iOS, Android). The primary interface for most users. The app’s design surfaces altcoin discovery prominently — new listings, trending pairs, and low-cap tokens are navigationally visible rather than buried. For users whose primary use case is altcoin exposure, this architecture is genuinely useful. For users focused on majors, the altcoin prominence can feel noisy.

Advanced features (margin, futures, copy trading, KCS Bonus tracking, staking, Earn products) are all accessible but require navigation depth. Chart analysis uses TradingView integration with 80+ indicators. Order types include advanced options (stop-limit, OCO, trailing stop) accessible through the trading interface.

Web Platform. Browser-based interface with more analysis depth than the app. Multi-chart layouts, detailed order book visualizations, and the full KCS Bonus dashboard showing daily dividend payouts across all coin types. For serious users, the web platform is meaningfully more productive than the app.

API. KuCoin’s REST and WebSocket APIs are well-designed and comprehensive. Documentation is solid. Rate limits are reasonable for most strategies. Third-party ecosystem support (CCXT, ccxt.pro, Hummingbot) is mature — smaller than Binance’s ecosystem but materially better than Bitget’s or Bybit’s. For systematic traders specifically focused on altcoin-heavy strategies, KuCoin’s API is in the second tier after Binance and OKX.

Latency advantage. Our measured API latency from Tokyo showed KuCoin at 23 ms median — second only to Binance (18ms). For Asia-based systematic trading, this places KuCoin in the top tier of responsiveness. The combination of low latency, deep books, and broad altcoin coverage makes KuCoin a credible systematic trading venue for Asia-based users.

Altcoin Listing Depth: KuCoin’s Other Differentiator

Beyond the measured $500k fill rate, KuCoin’s second real differentiator is altcoin listing breadth. This section goes deeper than typical reviews because the listing strategy is the other reason users specifically come to KuCoin.

Listing count. KuCoin lists 700+ spot trading pairs — approaching Binance’s scale and materially broader than OKX, Bybit, or Kraken. For newer tokens, emerging L1 blockchains, and small-cap altcoins, KuCoin is often the first major venue to list. This includes tokens that never reach Coinbase’s curated selection or Binance’s growing quality filter.

New token access. Users seeking exposure to tokens outside the top-100 by market cap often find them at KuCoin before they reach larger venues. For altcoin speculators specifically, this early access is a feature. For users wanting only curated, established tokens, it’s a reason to stay on Coinbase or Kraken.

Launchpad and new listings. KuCoin Spotlight hosts initial listings for new tokens with KCS-based allocation (similar to Binance Launchpad and OKX Jumpstart). For active participants, this produces incremental yield; for users wanting only established assets, it’s ignorable.

The honest risk. Broad listing creates real risk of exposure to low-quality projects. Multiple KuCoin-listed tokens have failed, exit-scammed, or had catastrophic protocol incidents. Listing at KuCoin is a gateway, not an endorsement — the exchange lists more permissively than conservative venues, and the user bears the quality-evaluation burden. Always do your own due diligence on individual tokens regardless of which exchange lists them.

Derivatives and Margin

KuCoin’s derivatives markets are functional but narrower than the derivatives-first specialists.

Perpetual futures. KuCoin lists perpetuals on 200+ pairs with leverage up to 100× on majors. Product quality is solid — matching engine handles mark price calculation appropriately, liquidation cascades use partial-first mechanics. But the product surface is narrower than Binance’s (300+ pairs), OKX’s (similar breadth but with options), or Bybit’s (300+ with deeper options markets). For derivatives traders needing breadth, KuCoin is secondary.

Margin trading. Cross and isolated margin available on spot pairs. Interest rates for borrowing are competitive. Margin liquidation mechanics are straightforward. For traders adding leverage to spot positions, KuCoin works fine — the integration with the deep spot books is actually a structural advantage versus thinner spot venues.

Copy trading. KuCoin offers copy trading with the same general mechanics as Bitget and Bybit. The network of elite traders is smaller than Bitget’s. Profit-share structure, ongoing costs, and honest limitations all apply similarly. For users wanting copy trading specifically, Bitget remains the most developed product.

Options. Minimal options offering. For any serious options trading, Deribit, Bybit, or OKX are better venues.

Security After 2020: What Changed

The 2020 hack was a real security failure. The five years since have been clean. Understanding what operationally changed matters for evaluating whether KuCoin’s current security posture is credible.

Hot wallet architecture redesign. The 2020 hack compromised hot wallet private keys stored in a vulnerable key management infrastructure. KuCoin’s post-hack redesign implemented stricter separation between hot and cold wallets, with hot wallet balances deliberately constrained to approximately 5% or less of total customer assets. Cold storage uses multi-signature controls across geographically distributed keys. This architecture is consistent with industry best practices as of 2024-2025.

Multi-signature expansion. Withdrawal authorization requires multiple independent signing parties. Individual engineer access to withdrawal-capable systems is restricted. Changes to wallet infrastructure require multi-party approval processes. These controls are now standard across major offshore exchanges — but weren’t universal in 2020.

Third-party security audits. KuCoin has expanded independent security auditing beyond what was in place in 2020. Published audit reports are less frequent than Coinbase’s SOC attestations or Kraken’s independent PoR audits, but more rigorous than the zero-audit status of some offshore competitors.

Insurance fund expansion. The KuCoin insurance fund (deployed during the 2020 recovery to cover unrecoverable losses) has been expanded and formalized. Publication of fund size is less consistent than at Binance (SAFU) or Bitget (Protection Fund) but the mechanism exists.

Five years of clean operations. Since September 2020, KuCoin has had no major successful security breaches. Partial outages, regulatory actions, and individual account compromises (typical across all exchanges) have occurred, but no systemic security failures affecting user funds. Whether five years is sufficient evidence of rebuilt security is an individual judgment. Kraken has 13 years clean; Coinbase has 13 years clean; OKX has 9 years clean; Binance had one hack in 2019 ($40M, reimbursed) and has been clean since. KuCoin’s post-2020 record is in line with the industry baseline for that time period — but the 2020 breach remains a factor in the total history.

Proof of Reserves

KuCoin publishes monthly Proof of Reserves with Merkle tree cryptographic attestations that let individual users verify their balances. Coverage includes BTC, ETH, USDT, and other major assets with reserve ratios typically at or above 100%. Third-party audit verification exists but is less consistent than Kraken‘s independently-audited PoR.

For users evaluating exchange solvency, KuCoin’s PoR publication meets current industry-standard expectations for offshore exchanges. It doesn’t match the transparency of public company financials (Coinbase) or the rigor of independently-audited PoR (Kraken), but it’s structurally better than zero transparency.

Execution Quality

KuCoin doesn’t use payment for order flow. Execution quality depends on matching engine performance and book depth. Our measured data shows specific strengths: best-in-class $500k fill rate (99.7%), competitive top-of-book pricing on majors (20.03 bps round-trip on BTC $10k), and solid tail-risk performance (1.094 bps p99 — 4th among venues tested).

The fill rate advantage isn’t incidental. KuCoin’s book structure maintains meaningful depth beyond the top-5 levels that dominate most exchanges’ visible liquidity. When a $500k market order would exhaust top-of-book liquidity at Binance or OKX, KuCoin typically has sufficient depth at levels 10-50 to absorb the remainder predictably. For traders sensitive to fill reliability over absolute top-of-book tightness, this structure is measurably different.

On altcoins specifically, KuCoin’s execution is competitive. LINK at $10k round-trip was 28.75 bps on KuCoin versus OKX’s leader at 23.63 bps — KuCoin is third place, meaningfully better than Binance’s 41.24 bps at the same size. For altcoin exposure beyond the top-10 tokens, KuCoin’s listing breadth combined with competitive execution makes it a credible primary venue.

Research and Market Tools

KuCoin publishes market commentary and token-level analysis through KuCoin Research and the platform’s blog. Quality is competent but not differentiated — better than Bitget or Bybit’s equivalent content but less substantive than Coinbase Institutional Research or Kraken Intelligence. For serious fundamental research, Messari, CoinGecko, and native crypto research platforms remain better sources.

The technical data infrastructure is solid. Historical OHLCV data, orderbook snapshots via REST, and tick-level trade history via WebSocket are all available. Documentation covers the v3 API comprehensively. For systematic traders, KuCoin’s data access is competitive with Binance and OKX — not industry-leading but genuinely usable.

Market data feeds carry no additional fees at any tier, consistent with offshore-exchange norms. For strategies needing depth data across many pairs (where KuCoin’s listing breadth is structural), the free data access is a meaningful advantage.

What Most Reviews Don’t Tell You

These are the limitations that matter but that most KuCoin reviews soften or skip.

The 2020 Hack History Is Permanent

No amount of post-hack operational improvement erases the fact that the 2020 breach happened. For users who weigh security track record heavily, KuCoin’s total history includes a $280M hack that simply isn’t true of Kraken, Coinbase, OKX, or Bitget. This is a legitimate filter. Five years of clean operations is evidence that the security improvements held; it’s not proof that another breach couldn’t happen. Individual risk tolerance determines whether this matters.

Listing Breadth Includes Low-Quality Projects

KuCoin’s 700+ spot pairs include many tokens that have failed, exit-scammed, or had catastrophic protocol incidents. The listing process is more permissive than Coinbase’s or Kraken’s. For traders who assume “listed on KuCoin” implies quality validation, the assumption is mistaken. Always do your own due diligence on individual tokens.

The KCS Bonus Is Subject to Trading Volume

KCS holder dividends depend on KuCoin’s trading fee revenue. During low-volume periods (bear markets, reduced retail activity), dividends shrink. The historical 2-6% annualized return is not guaranteed forward and has varied meaningfully. Treat KCS Bonus as a variable yield tied to exchange performance, not a reliable return.

US and New York Users Are Explicitly Restricted

The January 2024 NYDFS/DOJ settlement formalized US restrictions that had been informal. US users cannot legally use KuCoin. Previously accepted accounts were required to withdraw. VPN usage violates terms of service. If you’re in the US, the platform is simply not available regardless of other factors.

Customer Support Quality Is Variable

During high-volume events (major market moves, app outages, regional regulatory changes), support response times extend significantly. Routine issues get templated responses. Critical security issues are escalated but follow standard workflows. This is common across offshore crypto exchanges — KuCoin’s support is on par with Binance, OKX, Bybit, and Bitget, not notably better or worse.

Derivatives Product Surface Is Narrower

For active derivatives trading across multiple product types (perpetuals + dated futures + options + inverse contracts), Binance, OKX, and Bybit all offer more comprehensive coverage than KuCoin. KuCoin’s derivatives work for basic perpetual and margin trading but aren’t a primary venue for sophisticated multi-product strategies.

Verdict: Who Should Open a KuCoin Account

Open a KuCoin account if you meet at least one of these criteria:

You routinely trade $100k+ spot positions and need reliable fills. KuCoin’s measured 99.7% fill rate on $500k BTC orders is the best of any venue we tested — structural book depth that other exchanges don’t match.

You trade long-tail altcoins not available on major curated exchanges. KuCoin’s 700+ listing breadth provides access to newer and smaller tokens that Coinbase, Kraken, and often Binance don’t list. If altcoin access is central to your strategy, the listing breadth matters.

You’re a systematic trader based in Asia where the 23 ms median latency provides a real operational advantage, particularly when combined with deep books on majors.

You’re diversifying across multiple offshore exchanges and want a credible tertiary venue after Binance and OKX. KuCoin’s execution quality and listing breadth make it a strong third platform.

You’ve evaluated the 2020 hack history, understand what happened and how it was resolved, and conclude that five years of subsequent clean operations plus full user reimbursement during the original incident is sufficient evidence of adequate security posture for your use case.

If none of those apply — particularly if the 2020 security history is disqualifying for you — KuCoin is not the right venue. Kraken‘s 13-year clean record offers equivalent altcoin listing breadth in a US-regulated structure. Binance has equivalent latency and listing scope without the 2020 history. OKX has better altcoin execution for retail-size trades. Bitget has equivalent fill reliability without the hack history.

Frequently Asked Questions

What happened with KuCoin in 2020?

On September 25, 2020, KuCoin was hacked. Attackers compromised hot wallet keys and stole approximately $280 million in BTC, ETH, ERC-20 tokens, and other assets. KuCoin disclosed the breach within hours, worked with blockchain analytics firms to track stolen funds, coordinated with token projects to freeze assets on-chain, and ultimately recovered or compensated for 100% of stolen funds. All affected users were fully reimbursed within weeks. Since the 2020 incident, KuCoin has operated for five years without major successful security breaches. The exchange’s post-hack operational improvements (hot wallet architecture redesign, expanded multi-sig controls, increased insurance funding) are documented publicly.

Is KuCoin safe now?

KuCoin has operated for five years since September 2020 without successful major security breaches. The post-hack security architecture (hot/cold wallet separation, multi-sig controls, insurance fund) is consistent with industry best practices. Monthly Proof of Reserves with Merkle tree verification lets users verify balances. Whether this is sufficient security track record is an individual judgment — Kraken‘s 13-year clean record is structurally stronger, but KuCoin’s post-2020 operational record is solid. Like all centralized exchanges, KuCoin is not a long-term custody solution — use it for active trading and move long-term holdings to self-custody.

Can US residents use KuCoin?

No. Following the January 2024 NYDFS and DOJ settlement, KuCoin is explicitly restricted for US users. Previously-accepted US accounts were required to withdraw funds. VPN usage violates terms of service and risks account freezes. US residents should use Coinbase, Kraken, or Gemini.

What’s the KCS Bonus?

KCS Bonus is a daily dividend paid to KCS token holders from a portion of KuCoin’s trading fee revenue. The dividend is distributed proportionally to each user’s KCS balance and paid in various cryptocurrencies. Historical annualized returns have been approximately 2-6% depending on exchange trading volume, in addition to the 20% fee discount that KCS holders receive. The bonus is variable and depends on KuCoin’s platform activity — not guaranteed forward.

How does KuCoin compare to Binance?

Both offer broad altcoin listings and low base-tier fees. KuCoin has measurably better $500k BTC fill rate (99.7% vs 40%); Binance has better latency (18ms vs 23ms) and broader derivatives. On BTC/USDT at $10k, both deliver 20 bps round-trip — tied in measured retail execution. For spot size trading and broad altcoin access, KuCoin has structural advantages; for derivatives breadth and absolute lowest latency, Binance leads. Many active traders use both.

Can I use KuCoin for algorithmic trading?

Yes. The v3 API is well-designed with REST and WebSocket endpoints covering spot, margin, perpetuals, and account management. Latency from Asia is 23 ms median — second only to Binance (18ms). Third-party library support (CCXT, Hummingbot) is mature. For systematic strategies focused on altcoins where KuCoin’s listing breadth matters, the API is genuinely competitive. For absolute lowest latency on majors, Binance remains faster from most Asian geographies.

What makes KuCoin’s fill rate better than competitors?

Book structure. Most exchanges concentrate visible liquidity at the top-5 levels of the order book, producing tight spreads at top-of-book but thin depth beyond. KuCoin’s market makers and liquidity providers post orders across deeper levels — the top-50 levels typically have meaningful size rather than cosmetic orders. For large market orders that exhaust top-of-book liquidity, this structural depth allows the remainder to fill predictably. Bitget has a similar structure (99.4% fill rate); Binance, OKX, Bybit concentrate more at top-of-book (40%, 28.6%, 1.9% fill rates respectively).

Related: Crypto Exchange Comparison: 7 Venues Measured for 24 Hours — the measured liquidity dataset this review references. Also: Bitget Review — the alternative with equivalent fill reliability and no 2020 hack history. And: Binance Review — the primary alternative for broader altcoin coverage and fastest latency. Also: Kraken Review — the US-regulated alternative with 13-year clean security record.