synthetix-sdk 0.3.0

Official Python client for the Synthetix V4 perpetual futures exchange — REST + WebSocket, EIP-712 signing built in

synthetix-sdk

The official Python client for the Synthetix V4 perpetual futures exchange. Provides REST and WebSocket access for market data, trading, and account management, with EIP-712 signing built in.

Full API docs: developers.synthetix.io.

Get going in 30 seconds with Claude Code

The fastest way to try the SDK is the bundled Claude Code skill. Clone the repo, run /synthetix in a Claude Code session, and Claude will set up the environment, write and run example scripts, and explain the SDK as you go — no reading docs first.

git clone https://github.com/Synthetixio/synthetix-sdk
cd synthetix-sdk

Then in Claude Code:

/synthetix stream live prices for ETH-USDT
/synthetix place a limit order
/synthetix check my open positions
/synthetix watch my positions in real time

Claude does the wiring — .venv setup, dependency install, script generation, running, and walking you through the output. Pass any natural-language goal after the slash command.

Installation

To use the SDK in your own project:

pip install synthetix-sdk

Three runtime dependencies: requests, eth-account, websockets. Python 3.10+.

Quick Start

from synthetix import Synthetix

# Public market data — no private key needed
snx = Synthetix()
markets = snx.get_markets()
for m in markets:
    print(m["symbol"], m["description"])

# Authenticated — required for trading and account queries
snx = Synthetix(private_key="0x...")
print(snx.get_positions())
print(snx.get_portfolio())

For WebSocket streaming and async trading:

import asyncio
from synthetix import Synthetix

async def main():
    snx = Synthetix(private_key="0x...")

    # Stream real-time prices (no auth required)
    sub = await snx.subscribe(
        "marketPrices",
        lambda d: print(d),
        symbol="ETH-USDT",
    )

    # Place an order over WebSocket
    result = await snx.ws_place_order(
        symbol="BTC-USDT",
        side="buy",
        amount="0.001",
        price="90000",
    )

    await asyncio.sleep(10)
    await snx.unsubscribe(sub)
    await snx.close()

asyncio.run(main())

Features

Market data (public, no key required)

• List markets, fees, funding rates, open interest
• Tickers, mark prices, mids
• Order books at multiple depths
• Recent trades, candles, funding rate history

Trading

• Market, limit (GTC/GTD/IOC/post-only), TWAP, stop-loss, and take-profit orders
• Modify and cancel orders (single, batch, by client order ID, or all)
• Update leverage per market
• Schedule deferred cancellations as a kill-switch

Account management

• Positions, P&L, balance, portfolio, performance history
• Trade and order history, open orders, fills
• Funding payments and rate-limit status
• Sub-accounts: create, query, transfer collateral
• Delegated signers for ops accounts

WebSocket (async)

• Live subscriptions: prices, orderbook (snapshot/diff/managed), trades, positions, orders, fills, balances
• WS-native trading methods (ws_place_order, ws_cancel_order, ws_modify_order, …) — same signing, lower latency than REST
• Auto-reconnect with auth re-handshake and subscription replay
• Per-callback error handlers; sync and async callbacks both supported

Configuration

Synthetix(
    private_key=None,        # Omit for read-only mode
    subaccount_id=None,      # Auto-discovered if not set
    timeout=None,            # Request timeout in seconds
    expires_after_ms=60000,  # Signed-message expiry window
)

Examples

The repo includes standalone scripts for every endpoint under examples/rest/ and examples/ws/. Each is runnable on its own:

# Market data (no key)
python examples/rest/fetch-markets.py
python examples/rest/fetch-orderbook.py

# Trading (requires PRIVATE_KEY env var)
python examples/rest/create-limit-gtc-order.py
python examples/rest/cancel-order.py

# WebSocket
python examples/ws/async-watch-ticker.py
python examples/ws/async-market-order.py
python examples/ws/async-watch-positions.py

API reference

• Full HTTP/WS protocol docs: developers.synthetix.io
• REST API — MarketAPI (public) and AccountAPI (authenticated)
• WebSocket API — subscriptions, channels, and async trading methods