Horizon + Coinbase

Trade crypto on Coinbase Advanced Trade for spot and cross-asset strategies.

Coinbase Advanced Trade is a crypto exchange with deep liquidity across hundreds of trading pairs. Horizon connects to Coinbase for spot crypto trading and cross-asset strategies alongside prediction markets.

Quick Setup

hz.run(
    name="crypto_mm",
    exchange=hz.Coinbase(api_key="...", api_secret="..."),
    mode="live",
    ...
)

Credentials

Explicit

hz.Coinbase(api_key="organizations/...", api_secret="-----BEGIN EC...")

Environment variables

export COINBASE_API_KEY="organizations/..."
export COINBASE_API_SECRET="-----BEGIN EC PRIVATE KEY-----\n..."

hz.Coinbase()  # reads from env

Coinbase Configuration

@dataclass
class Coinbase:
    api_key: str | None = None
    api_secret: str | None = None
    api_url: str = "https://api.coinbase.com/api/v3/brokerage"

Field	Default	Description
api_key	None	Coinbase API key (env: COINBASE_API_KEY)
api_secret	None	Coinbase API secret (env: COINBASE_API_SECRET)
api_url	https://api.coinbase.com/api/v3/brokerage	Override API base URL

Authentication

Coinbase uses HMAC-SHA256 signature auth. Three headers are sent on every request:

• CB-ACCESS-KEY: {api_key}
• CB-ACCESS-SIGN: HMAC-SHA256(timestamp + method + path + body)
• CB-ACCESS-TIMESTAMP: {unix_timestamp}

Market Data Feed

Real-time crypto ticker via WebSocket:

hz.run(
    feeds={
        "btc": hz.CoinbaseFeed(product_ids=["BTC-USD"]),
        "eth": hz.CoinbaseFeed(product_ids=["ETH-USD", "SOL-USD"]),
    },
    ...
)

The feed connects to wss://advanced-trade-ws.coinbase.com and subscribes to the ticker channel with authenticated messages.

Each product gets its own snapshot entry keyed by {feed_name}:{PRODUCT_ID} (e.g., btc:BTC-USD), plus a feed-level entry with the latest update.

Field	Type	Default	Description
product_ids	list[str]	required	Trading pairs to subscribe (e.g., ["BTC-USD", "ETH-USD"])
api_key	str	None	Override API key (defaults to env vars)
api_secret	str	None	Override API secret (defaults to env vars)

Symbol Mapping

Coinbase uses product IDs in BASE-QUOTE format:

market = hz.Market(id="BTC-USD", name="Bitcoin / USD")

Horizon Field	Coinbase Field	Notes
OrderRequest.market_id	product_id	e.g., “BTC-USD”, “ETH-USD”
OrderRequest.order_side	side	"BUY" or "SELL"
OrderRequest.price	limit_price	Limit order price
OrderRequest.size	base_size	Base currency amount

Coinbase uses Side.Long for all positions. Prediction market concepts like Side.Yes / Side.No do not apply to crypto orders.

Multi-Exchange

Use Coinbase alongside prediction markets for crypto-correlated hedging:

hz.run(
    name="crypto_hedge",
    exchange=[
        hz.Polymarket(),    # prediction market
        hz.Coinbase(),      # crypto hedge
    ],
    feeds={
        "btc_pred": hz.PolymarketBook("will-btc-hit-150k"),
        "btc_spot": hz.CoinbaseFeed(product_ids=["BTC-USD"]),
    },
    pipeline=[my_strategy],
)

Getting API Keys

1. Sign in at coinbase.com/advanced-trade
2. Go to Settings > API
3. Create a new API key with Trade permissions
4. Save both the API key and secret securely