CCXT vs the HTX API

HTX (formerly Huobi) is one of the larger global venues, with spot, cross and isolated margin, coin-margined futures, coin-margined swaps and USDT-margined swaps behind a set of related APIs. To integrate it you either use the official SDKs published by HuobiRDCenter, or go through CCXT, where HTX is a certified exchange sitting behind an API shared with 103 other venues.

Both work. The question that decides between them is the same one HTX's own repository layout poses: do you need more than one HTX product line, or more than one venue?

TL;DR

• Pick the official HTX SDKs if you trade a single product line, work in one of the five languages they cover, and want request and response models that mirror HTX's API reference literally.
• Pick CCXT if you want spot, margin, futures and swaps in one client, in any of seven languages, with the rate limiter, precision handling, order-book maintenance and error taxonomy already written.
• Choosing CCXT does not hide HTX's API. All 460 HTX endpoints in CCXT's api block are generated as implicit methods, signed and rate-limited like any unified call.

At a glance

_{Figures verified September 2026 against CCXT v4.5.77, the HuobiRDCenter GitHub organisation and HTX's published API documentation.}

The same job, written both ways

Fetch recent candles

import ccxt

exchange = ccxt.htx()
candles = exchange.fetch_ohlcv('BTC/USDT', '5m', limit=10)
for timestamp, o, h, l, c, v in candles:
    print(timestamp, o, h, l, c, v)

CCXT returns a unified OHLCV array — [timestamp, open, high, low, close, volume], milliseconds, same on every venue. The SDK returns HTX's own candlestick objects and its own interval enum.

Place a limit order

import ccxt

exchange = ccxt.htx({'apiKey': '...', 'secret': '...'})
order = exchange.create_order('LTC/USDT', 'limit', 'buy', 4.0, 1.292)
print(order['id'], order['status'])

Two things to notice. First, HTX's spot API is account-scoped: you have to look up an account_id before you can place an order, and pass it on every call. CCXT resolves and caches that for you. Second, OrderType.BUY_LIMIT fuses side and type into one enum — a shape that does not survive contact with a second exchange. CCXT keeps side and type as separate unified arguments.

To place the same order on a USDT-margined swap with the official SDKs, you switch to the contract SDK — a different repository, different client classes, different signatures. With CCXT you change the symbol and, if you want swaps to be the default, one option:

exchange = ccxt.htx({'apiKey': '...', 'secret': '...',
                     'options': {'defaultType': 'swap'}})
order = exchange.create_order('BTC/USDT:USDT', 'limit', 'buy', 1, 60000)

Where the differences actually bite

Spot and contracts are two SDKs, one CCXT class

This is the structural difference. HuobiRDCenter maintains a spot SDK per language (huobi_Python, huobi_Java, huobi_Golang, huobi_Cpp, huobi_CSharp) and a separate contract SDK per language (huobi_python_contract, huobi_java_contract, huobi_csharp_contract, huobi_cpp_contract, huobi_futures_Golang). A strategy that quotes spot and hedges on USDT-margined swaps pulls in two projects, two client hierarchies and two sets of conventions.

The attention gap between them is visible in the star counts: 689 on the Python spot SDK versus 13 on the Python contract SDK, 269 on the Java spot SDK versus 2 on the Java contract SDK.

CCXT ships all of it as one ccxt.htx instance. options.defaultType selects spot, margin, swap or future; the method names do not change.

Seven languages, one API

CCXT is written once in TypeScript and transpiled to JavaScript, Python, PHP, C#/.NET, Go and Java, so method names, arguments and return structures are identical everywhere. HTX's SDKs are five separate codebases with separate idioms and separate release schedules — and no PHP or JavaScript SDK at all.

import ccxt
exchange = ccxt.htx()
ticker = exchange.fetch_ticker('BTC/USDT')

Installation and dependency management

CCXT is a published package in every one of its languages: pip install ccxt, npm install ccxt, composer require ccxt/ccxt, dotnet add package ccxt, go get, Maven. The official HTX Python spot SDK is distributed as source — its README instructs you to download the repository and open the source in your project. That matters for reproducible builds, dependency pinning and CI.

Be careful with PyPI here: the huobi package on PyPI is a third-party project by an independent author, not HuobiRDCenter's SDK.

WebSockets that look like REST

CCXT Pro — bundled in the same ccxt package, no separate purchase — gives HTX 11 streaming methods: watchOrderBook, watchTicker, watchTrades, watchOHLCV, watchOrders, watchMyTrades, watchBalance, plus unWatchTicker, unWatchOHLCV, unWatchTrades and unWatchOrderBook for tearing a subscription down without dropping the connection.

import ccxt.pro
import asyncio

async def main():
    exchange = ccxt.pro.htx()
    while True:
        orderbook = await exchange.watch_order_book('BTC/USDT')
        print(orderbook['bids'][0], orderbook['asks'][0])

asyncio.run(main())

watch_order_book returns the same structure as fetch_order_book. Underneath, CCXT handles connection pooling per URL, HTX's gzip-deflated WebSocket frames and its ping/pong dialect, automatic reconnect and resubscribe, the REST-snapshot-plus-delta merge with sequence-gap detection, and bounded caches for trades and candles. HTX's WebSocket surface is split across spot and contract hosts with different message formats; watch_order_book('BTC/USDT') and watch_order_book('BTC/USDT:USDT') are the same call in CCXT.

Rate limits you do not have to model

HTX meters market-data, public and private interfaces separately, and the limits have changed more than once — HTX publishes adjustments as support notices rather than only in the reference, and returns the remaining allowance in response headers. CCXT encodes per-endpoint cost in the exchange definition and ships a token-bucket throttler that is on by default (enableRateLimit = true, rateLimit = 100 ms), so a loop of calls is paced without you tracking which interface group each one belongs to.

Precision, rounding and string math

HTX rejects orders that violate tick size, step size or minimum notional, and its spot amount precision differs per symbol. CCXT loads market metadata and gives you amount_to_precision, price_to_precision and cost_to_precision, backed by the Precise string-arithmetic class so quantities do not drift through float rounding.

amount = exchange.amount_to_precision('BTC/USDT', 0.0012345678)
price = exchange.price_to_precision('BTC/USDT', 61234.56789)

One error hierarchy

CCXT maps HTX's err-code values onto a typed exception tree — InsufficientFunds, InvalidOrder, OrderNotFound, RateLimitExceeded, AuthenticationError, NetworkError, ExchangeNotAvailable and 34 more, all under BaseError. You write except ccxt.InsufficientFunds once instead of matching on order-value-min-error and hoping the string never changes.

No sandbox, on either side

CCXT's HTX definition has no active test URLs, so exchange.set_sandbox_mode(True) raises NotSupported. Neither do the official SDKs offer a testnet path. Plan to validate against a small live account, and lean on CCXT's static request and response fixtures for regression testing rather than expecting a paper-trading environment.

Nothing is hidden — the implicit API

Alongside the 87 unified capabilities, all 460 endpoints in CCXT's HTX api block are generated as callable implicit methods, camelCased from their paths:

sub_users = exchange.v2_private_get_sub_user_user_list()
adjust = exchange.contract_public_get_linear_swap_api_v1_swap_adjustfactor()

Signing, timestamping, rate-limit accounting and error mapping still apply. So the unified API covers what every venue shares, and the implicit API covers HTX's own corners — sub-account management, ETP, algo orders, cross-margin ladders — without dropping to raw HTTP. Browse them on the HTX implicit API page.

Maintenance

CCXT's HTX integration is roughly 10,100 lines of REST implementation plus 2,900 lines of WebSocket implementation, backed by static request and response fixtures that are replayed in every language on every build. HTX also carries CCXT's certified badge, which means the implementation is supervised and quality-assured by the CCXT dev team and gets priority support. When HTX changes a response shape, the fix reaches you as a version bump.

What the official HTX SDKs do better

An honest list, because these are real:

• Literal fidelity to the HTX documentation. MarketClient, TradeClient, MarginClient, AlgoClient, ETFClient, SubuserClient map onto the sections of HTX's reference one for one. Reading the docs and reading the SDK is the same activity. CCXT's unified naming is one hop away from that.
• C++ coverage. HuobiRDCenter publishes a C++ spot SDK and a C++ contract SDK. CCXT has no C++ target, so for a C++ execution path the vendor SDK is the only maintained option of the two.
• Product corners a unified API does not model. ETF/ETP endpoints, sub-user management and some margin ladder queries are first-class SDK clients. CCXT reaches them only as raw implicit calls, which works but is not typed or documented as a unified method.
• A smaller dependency for a single product line. If all you ever do is HTX spot market data in Java, huobi_Java alone is a smaller surface than all of CCXT.

If HTX is your only venue, you work in C++, or you are staying inside one product line and want the vendor's exact vocabulary, the official SDKs are a defensible choice.

Migrating from an HTX SDK to CCXT

FAQ

Is HTX the same as Huobi? Yes — Huobi rebranded to HTX. CCXT's exchange id is htx, and the class covers the venue formerly documented as Huobi Global. The huobi id is retained as an alias in CCXT's history, but ccxt.htx is the current name.

Does CCXT support HTX futures and swaps, or only spot? All of them from one client: spot, cross and isolated margin, coin-margined futures, coin-margined swaps and USDT-margined swaps. Select with options.defaultType and the unified symbol — 'BTC/USDT' for spot, 'BTC/USDT:USDT' for the linear swap, 'BTC/USD:BTC' for the inverse.

Does HTX have a testnet I can use through CCXT? No. CCXT's HTX definition has no active test URLs, so set_sandbox_mode(True) raises NotSupported. Validate against a small live account instead.

Can I still call HTX-specific endpoints through CCXT? Yes — all 460 endpoints in CCXT's HTX definition are generated as implicit methods, with signing, rate limiting and error mapping applied.

Is the huobi package on PyPI the official SDK? No. It is a third-party project by an independent author. The official Python SDKs are the HuobiRDCenter repositories, distributed as source rather than as a PyPI package.

Do I need CCXT Pro separately for WebSockets? No. CCXT Pro is included in the ccxt package. Use ccxt.pro.htx and call watch* methods.

Is CCXT free? Yes. MIT-licensed, including the WebSocket support.

Next steps

• Install CCXT in your language
• Manual — the unified API, structures and conventions
• htx unified API reference
• htx implicit API — every raw endpoint
• CCXT Pro manual — WebSocket methods
• More comparisons