CCXT vs the raw BYDFi API

BYDFi documents a perpetual-futures trading API at developers.bydfi.com. What it does not publish is a client library.

That is not a guess. There is no bydfi, bydfi-api or bydfi-sdk package on npm, and none on PyPI. The bydfi-official/api-docs repository on GitHub contains documentation and configuration files only — no client code. A GitHub search for repositories matching "bydfi" returns referral pages, personal bots and scraping scripts, and no first-party wrapper in any language.

So the comparison here is not CCXT against a vendor SDK. It is CCXT against the HTTP client you were about to write — and against the derivatives plumbing that comes with it.

TL;DR

• Write it yourself if you need three endpoints, you are in a language CCXT does not target, or you want the signing visible in your own repository.
• Pick CCXT if you want signing, streaming, leverage and margin-mode handling, position bookkeeping, precision and typed errors already implemented against the live venue — 60 unified capabilities, 10 watch* methods and all 45 endpoints.
• The derivatives surface is what you would spend the time on. Leverage, margin mode, hedge-vs-one-way position mode, reduce-only and trailing orders, sub-wallets and position history are all things CCXT already models with the same names it uses on Bybit, OKX and Binance futures.

At a glance

_{Figures verified September 2026 against CCXT v4.5.77, the bydfi-official/api-docs repository, a GitHub repository search for BYDFi client libraries, and npm and PyPI registry lookups.}

The same job, written both ways

Fetch a ticker

import ccxt

exchange = ccxt.bydfi()
ticker = exchange.fetch_ticker('BTC/USDT:USDT')
print(ticker['last'], ticker['baseVolume'])

'BTC/USDT:USDT' is CCXT's unified notation for a USDT-settled linear perpetual — the same string identifies the equivalent contract on Bybit, OKX or Binance. BTC-USDT is BYDFi's own market id, which CCXT resolves for you through load_markets().

The CCXT call returns a unified ticker structure: consistent keys, milliseconds, base and quote volume separated. The raw call returns BYDFi's payload wrapped in a {code, message, data} envelope you unwrap yourself.

Place a limit order

import ccxt

exchange = ccxt.bydfi({'apiKey': '...', 'secret': '...'})
order = exchange.create_order('BTC/USDT:USDT', 'limit', 'buy', 0.001, 90000)
print(order['id'], order['status'])

The signed payload differs by HTTP method — apiKey + timestamp + urlencoded_query on GET, apiKey + timestamp + json_body on POST — and in both cases the parameters must be key-sorted first or the signature will not match. CCXT does that internally, and does the equivalent for the other 103 exchanges without you learning each variant.

Stream an order book

BYDFi is one of the 76 CCXT exchanges with WebSocket support. bydfi has 10 watch* methods: watchOrderBook, watchOrderBookForSymbols, watchTicker, watchTickers, watchOHLCV, watchOHLCVForSymbols, watchOrders, watchOrdersForSymbols, watchPositions and watchBalance.

import ccxt.pro
import asyncio

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

asyncio.run(main())

watch_order_book returns the same structure as fetch_order_book, already merged and depth-limited, so swapping a polling loop for a stream leaves the downstream code untouched. Every line in the right-hand column is a place a hand-rolled book goes quietly wrong — it does not throw, it drifts, and you find out from a fill you did not expect. watch_positions and watch_balance matter more on a derivatives venue than on spot: liquidation risk is a function of margin you want pushed to you, not polled.

Where the differences actually bite

The derivatives surface is already modelled

This is the bulk of the work you would otherwise do yourself. CCXT implements, with the same names it uses on every other futures venue:

exchange.set_leverage(10, 'BTC/USDT:USDT')
exchange.set_margin_mode('isolated', 'BTC/USDT:USDT')
exchange.set_position_mode(True)                       # hedge mode
positions = exchange.fetch_positions(['BTC/USDT:USDT'])
history   = exchange.fetch_positions_history(['BTC/USDT:USDT'])
funding   = exchange.fetch_funding_rate('BTC/USDT:USDT')

Order types too: stop-loss, take-profit, stop-limit, post-only, reduce-only and trailing-percent orders are unified params on create_order, not four separate request shapes. create_orders and edit_orders map onto BYDFi's batch endpoints, and edit_order_with_client_order_id lets you amend by your own id rather than the exchange's.

BYDFi also has sub-wallets — W001 is the default contract wallet — and CCXT threads that through as params['wallet'] on the methods that need it.

Rate limits you do not have to model

CCXT ships a token-bucket throttler that is on by default, at rateLimit = 50 ms for bydfi. BYDFi also exposes an endpoint that reports your own rate-limit configuration, which CCXT surfaces as an implicit method:

limits = exchange.public_get_v1_public_api_limits()

Hand-rolled, pacing and back-off on a 429 are your code, and the endpoint above is one you have to remember exists.

One error hierarchy

CCXT maps BYDFi's {code, message} envelopes onto a typed exception tree — InsufficientFunds, InvalidOrder, OrderNotFound, RateLimitExceeded, AuthenticationError, NetworkError, ExchangeNotAvailable and 34 more, all descending from BaseError. You write except ccxt.InsufficientFunds once instead of matching on numeric codes and hoping the wording never changes.

Precision, rounding and string math

load_markets() reads BYDFi's contract metadata — tick size, step size, minimum and maximum quantity for both limit and market orders — and exposes it through amount_to_precision, price_to_precision and cost_to_precision, backed by the Precise string-arithmetic class.

amount = exchange.amount_to_precision('BTC/USDT:USDT', 0.0012345678)

On a leveraged venue this is not cosmetic: a rejected order because a quantity drifted in the last decimal place is a position you did not open or did not close.

Seven languages, one API

CCXT is written once in TypeScript and transpiled to JavaScript, Python, PHP, C#/.NET, Go and Java, with identical method names and return structures. Since BYDFi publishes nothing first-party, every language starts from zero without it.

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

Nothing is hidden — the implicit API

Alongside the 60 unified capabilities, all 45 BYDFi endpoints are generated as callable implicit methods, with signing, rate limiting and error mapping applied — including the affiliate and agent endpoints that have no unified equivalent:

# any raw BYDFi endpoint, camelCased from its path
response = exchange.private_get_v1_agent_affiliate_commission()

Browse them on the bydfi implicit API page.

What going direct to the BYDFi API does better

An honest list, because these are real:

• A far smaller dependency. One requests call is three lines. For a price display or a one-off backfill, all of CCXT is more than you need.
• Field-for-field fidelity with the docs. positionSide, workingType, activatePrice, wallet — reading BYDFi's reference while debugging is one hop shorter when there is no translation layer. CCXT's unified names are a deliberate abstraction.
• Cancelling a single order. CCXT reports has['cancelOrder'] == False for bydfi; what is implemented is cancel_all_orders(symbol), matching BYDFi's complete-cancellation endpoint. If you need finer-grained cancellation than that, you reach for the raw endpoint either way.
• New endpoints the day they ship. BYDFi's documentation changes when the API does. A unified CCXT method for a brand-new feature can lag, even though the implicit API reaches the endpoint immediately.
• Spot markets. CCXT's bydfi models perpetual futures; features.spot is undefined and the unified market list is contracts only. Deposits, withdrawals and transfers are unified, but there are no unified spot trading pairs.

If BYDFi is your only venue and your integration is a handful of futures endpoints, writing it directly is a defensible choice.

Migrating from a direct BYDFi integration to CCXT

Start with Install, then the Manual, then the bydfi unified API reference.

FAQ

Is there an official BYDFi SDK? None was published as of September 2026. There is no bydfi package on npm or PyPI, and BYDFi's only GitHub repository, bydfi-official/api-docs, contains documentation rather than client code. CCXT is the maintained option in seven languages.

Does CCXT support BYDFi WebSockets? Yes. bydfi has 10 watch* methods, including watch_order_book, watch_ohlcv, watch_orders, watch_positions and watch_balance, plus the *ForSymbols multi-symbol variants. Use ccxt.pro.bydfi.

Does CCXT support BYDFi spot trading? CCXT's bydfi models the perpetual-futures API — the unified markets are linear swaps like 'BTC/USDT:USDT', and there is no unified spot market list. Account-side spot endpoints are still covered: fetch_deposits, fetch_withdrawals, transfer and fetch_transfers all work.

How do I cancel one BYDFi order in CCXT? has['cancelOrder'] is false for this venue; CCXT implements cancel_all_orders(symbol), which maps to BYDFi's complete-cancellation endpoint. For finer control, call the raw endpoint as an implicit method.

Does BYDFi have a testnet I can use with CCXT? No sandbox environment is published, so set_sandbox_mode(True) has nothing to point at for bydfi. Test against CCXT's offline static fixtures and small live orders.

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

Next steps

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