Okx

Okx is a spot exchange built around order-book trading

Okx is a crypto marketplace that holds customer assets and matches buyers with sellers through an order book. That design gives spot traders market and limit orders, maker-taker pricing, crypto deposits, and on-chain withdrawals in one account. Its proof-of-reserves system uses zk-STARKs, a privacy-preserving way to prove balance constraints, across a published set of reserve assets. The main constraint is regional: legal entity, available pairs, funding rails, fees, and advanced products change with residence. This brief explains the deposit workflow, spot mechanics, fee logic, custody model, account setup, regional boundaries, and the alternatives that change the decision.

A 30-day activity window sets fee tiers, while a 24-hour lock can delay withdrawals to newly added addresses.

The network choice that decides whether a deposit arrives

Two checks prevent the most common Okx deposit error: the asset must match, and the sending network must be identical to the network selected on the deposit screen. Ethereum and Tron are network names, while ERC-20 and TRC-20 identify token standards. Matching only the USDT ticker isn't enough because Tether issues USDT on several chains.

Confirmation targets add a second timing constraint. A USDT deposit over Tron requires 19 confirmations, while the Ethereum route requires 32. Layer 2 deposits through Base, Optimism, or Arbitrum One settle on their own network before final Layer 1 processing. XRP, XLM, and ATOM also use a tag or memo; the displayed Okx identifier is typically 7–8 digits and must accompany the address.

Okx charges 0 platform fee for a crypto deposit. One withdrawal therefore produces 1 network charge, shown before confirmation.

Coinbase, Kraken, Binance, and Uniswap shift the custody trade-off

Four alternatives frame the Okx decision clearly: Coinbase Advanced, Kraken Pro, and Binance use custodial order books, while Uniswap executes self-custody swaps through automated liquidity pools. Coinbase Advanced integrates TradingView charts, Kraken Pro separates spot from margin in its order form, and Binance pairs its spot book with a simpler Convert flow.

Uniswap keeps tokens in the user's wallet until a smart-contract swap executes, so the trader pays network gas and the pool's fee instead of funding a custodial balance. Uniswap v3 defines 4 standard pool tiers - 0.01%, 0.05%, 0.30%, and 1% - but price impact still follows pool liquidity. That route favors direct on-chain control; Okx favors centralized matching, account recovery, and transfers between funding and trading balances.

How does Okx spot trading work?

Two core Okx order types cover most spot trades: a market order accepts available offers immediately, while a limit order sets the worst price that the trader will accept. The matching engine fills buys against asks and sells against bids in the selected order book.

A market order prioritizes speed, so several price levels may fill one instruction when the best quote lacks enough quantity.

A limit order fixes the maximum buy price or minimum sell price. Good till Canceled is the default duration, and 3 advanced instructions refine execution. Post Only cancels an order that would trade immediately, preserving maker status. Fill or Kill demands an immediate, complete fill. Immediate or Cancel fills the available portion and removes the remainder. Trigger and take-profit or stop-loss instructions create another order only after their stated condition occurs. A regular limit order can still take liquidity if its price matches an existing offer, so "limit" controls price rather than fee class.

After a fill, the sold balance decreases, the acquired asset increases, and the fee appears in trade history. BTC/USDT shows the pair logic: Bitcoin is the base asset, and Tether is the quote asset.

Fee tiers reward posted liquidity and larger activity

A 30-day measurement window sets the Okx fee tier, while each fill receives either the maker rate for posted liquidity or the taker rate for immediate execution. A marketable limit order is a taker even though its order type says "limit." More context is available in Using Okx.

A Regular account below both 100,000 USD in assets and 1,000,000 USD in 30-day spot volume pays 0.0800% as maker and 0.1000% as taker. Crossing either VIP 1 threshold moves the published rates to 0.0675% and 0.0800%. The schedule contains 10 bands from Regular through VIP 9. Asset thresholds apply at account level, while spot volume stays within its product line. Pair-specific exceptions exist, so the order panel controls the actual fill.

Fees accrue only on filled quantity. An unfilled Good till Canceled order doesn't generate a trading fee.

Execution cost also includes the spread between the best bid and ask, plus movement through deeper book levels. A post-only instruction controls maker status, while a plain limit order can cross the book. When price control matters more than immediate completion, the relevant tool is Post Only.

Proof of reserves checks assets against account liabilities

Twenty-two reserve assets and 3 balance constraints form the published Okx proof-of-reserves scope, linking on-chain wallet holdings with aggregated account liabilities without exposing individual balances. The covered set includes Bitcoin, Ethereum, Tether, and USD Coin.

The system places account balances into an encrypted Merkle structure, then uses zk-STARK proofs for total balance, non-negative balance, and inclusion constraints. The published reserve test passes when the on-chain asset balance equals or exceeds account assets, producing a ratio of at least 100%. A user can verify inclusion, while public wallet addresses support the asset side of the calculation. This mechanism makes the report inspectable without publishing each customer's balance or account identity. Reserve files and an open-source validator allow the proof to be checked outside the account interface.

A reserve report remains a point-in-time snapshot and doesn't describe every corporate obligation. That boundary matters when interpreting the 22-asset report.

Where is Okx available?

Thirty European Economic Area states sit under the European Okx service, while the U.S. Okx platform doesn't serve 6 named jurisdictions, so location determines the actual product. The European entity operates under a MiCA authorization, and its terms set an 18-year minimum age. U.S. exclusions include New York, Texas, American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands. Pair lists, fiat rails, Earn products, and derivatives access still differ locally. That check matters most in New York and Texas, 2 of the 6 U.S. exclusions.

Account setup ends with identity checks and security controls

One identity review, which the U.S. onboarding flow says takes up to 24 hours, unlocks account funding before Okx adds passkeys, two-factor authentication, and withdrawal controls. Registration supports common sign-in methods, but verified identity information determines account eligibility and limits.

Passkeys use the FIDO2 standard and require compatible software. Published device floors include Windows 10, macOS Ventura, iOS 16.0.0, or Android 7. Browser floors include Chrome 109, Safari 16, and Edge 109. A compatible USB security key supplies another authentication route.

The withdrawal allowlist restricts transfers to saved addresses. Its new-address lock holds withdrawals for 24 hours after an address is added. On the web, the address book accepts 50 entries per batch without a total cap. An address can receive a default 30-day verification or permanent verification; with the default, making no withdrawal within 30 days lets that status expire. Permanent verification avoids that rolling expiry until the user changes the address setting. These settings create deliberate friction around a high-consequence account action, especially the first 24 hours.

Fit depends on custody, region, and trading style

Three decisions identify a strong Okx fit: whether custodial trading is acceptable, whether the local product lists the needed market, and whether order-book tools matter. Broad spot functionality is useful only when the funding route and withdrawal network also match the trader's plan.

Use this decision checklist before opening an account:

• Confirm that registration and the required fiat rail are available in the country of residence.
• Find the exact spot pair, rather than assuming that listing a token creates every quote pair.
• Match the intended deposit and withdrawal chain, including any required memo or tag.
• Choose custody deliberately: an exchange balance supports fast trading, while a wallet keeps keys with the user.
• Check the displayed fee tier and use Post Only when waiting for maker execution is acceptable.

The strongest fit is an active spot trader who values order types, account recovery, and a centralized order book. Long-term storage calls for a separate custody decision, while wallet-native swaps point toward a protocol such as Uniswap.