basis_bpsBasis (bps)
Basis in basis points measures the relative premium or discount of the derivative against its reference market.
This makes it a core signal for carry, positioning pressure, and cross-market dislocations.
Derivatives
Perpetual futures mark price premium over index price (basis) and last trade price, in absolute and basis-point terms.
Need the ticks behind this metric? Prime + Raw includes raw mark price, index price, trades.
Shown: basis_bps, hourly, 1–31 January 2024, from this page's Sample CSV · extreme: 20.4 bps, 2 Jan, 00:00 UTC · built with basis
basis_bpsBasis in basis points measures the relative premium or discount of the derivative against its reference market.
This makes it a core signal for carry, positioning pressure, and cross-market dislocations.
mark_price_spread_bpsMark-Price Spread in basis points shows the gap between the exchange mark and the traded market price on a relative scale.
The spread matters because mark prices influence liquidation engines, risk controls, and PnL calculations even when the last trade wanders.
basis_meanMean Basis summarizes the average premium or discount sustained through the interval rather than at a single moment.
That makes it helpful for distinguishing persistent carry conditions from brief spikes or flickers.
basis_bps_stdBasis Std Dev in basis points measures how unstable the relative pricing relationship was inside the bar.
A high reading suggests basis was moving around materially, which can complicate hedging and carry strategies.
mark_price_spread_bps_stdThis metric tracks the variability of the mark-price gap, not just its average level.
That distinction matters because some markets spend long periods close to fair value but occasionally experience sharp internal repricing.
In crypto perpetual futures, the basis — the difference between the perpetual contract price and the spot index — is the market's real-time thermometer for speculative demand versus hedging supply. Unlike traditional futures where basis reflects cost-of-carry and time-to-expiry, the perpetual basis is a pure measure of the supply-demand imbalance for leveraged exposure.
/api/v1/data/basis| Field | Name | Description |
|---|---|---|
basis | Basis | Last mark price minus index price in the interval |
basis_bps | Basis (bps) | Last mark-versus-index spread in basis points of the index price |
mark_price_spread | Mark-Price Spread | Last mark price minus last traded price in the interval |
mark_price_spread_bps | Mark-Price Spread (bps) | Last mark-versus-last-price spread in basis points of the last price |
basis_mean | Mean Basis | Average mark price minus index price in the interval |
basis_bps_std | Basis Std Dev (bps) | Standard deviation of the mark-versus-index spread in basis points |
mark_price_spread_mean | Mean Mark-Price Spread | Average mark price minus last traded price in the interval |
mark_price_spread_bps_std | Mark-Price Spread Std Dev (bps) | Standard deviation of the mark-versus-last-price spread in basis points |
# Install the Aperiodic CLI into ~/.local/bin
mkdir -p "$HOME/.local/bin"
curl -fsSL https://raw.githubusercontent.com/aperiodic-io/cli/main/install.sh | INSTALL_DIR="$HOME/.local/bin" bash
export PATH="$HOME/.local/bin:$PATH"
# Free preview — no API key required
aperiodic basis --preview \
--exchange binance-futures \
--symbol perpetual-BTC-USDT:USDT \
--interval 5m \
--timestamp exchange \
--start-date 2025-05-01 \
--end-date 2025-05-31 \
--output-dir ./data && echo "Saved to $PWD/data"Every new row as it is computed, over WebSocket at wss://stream.aperiodic.io/v1/stream. Authenticate with your API key in the X-API-KEY header and subscribe to channels named basis.<exchange>.<interval>, on intervals 1m, 5m, 15m, 30m, 1h, 4h, 1d. Streaming is included on Live plans.
pip install "aperiodic[stream]"import os
from aperiodic import stream
for message in stream(
api_key=os.environ["APERIODIC_API_KEY"],
dataset="basis",
exchange="binance-futures",
interval="1m",
symbols=["perpetual-BTC-USDT:USDT"], # omit for every symbol on your plan
):
print(message.channel, message.snapshot, message.data)timestampreqstringTimestamp source. 'exchange' uses the exchange-reported timestamp, 'true' uses actual arrival time at our servers.
exchangetrueintervalreqstringAggregation time interval for the data.
1m5m15m30m1h4h1dexchangereqstringSource exchange for the data.
binance-futuresokx-perpshyperliquid-perpssymbolreqstringTrading pair symbol in the format of Atlas' universal symbology: https://github.com/aperiodic-io/atlas
start_datereqstring<date>Start date for the data range (YYYY-MM-DD format). A metric series starts on the first day of the raw series it is computed from (see /metadata/raw); raw trades and quotes start binance-futures from 2020-01-01, okx-perps from 2019-09-01, hyperliquid-perps from 2025-01-01. Earlier days return no files. How far back you can go depends on the plan: 5 years on Pro, full history on Prime, Prime + Raw and Institutional. An earlier start_date than the plan reaches returns 403.
end_datereqstring<date>End date for the data range (YYYY-MM-DD format). Must be greater than or equal to start_date.
Successful response with download URLs for every existing file covering the range from the series' published start — one per month before 2026-08-01, one per day from 2026-08-01 onwards
filesobject[]requiredFiles covering the requested date range, in chronological order. Data before 2026-08-01 is split by month (one file per calendar month, no `day`); data from 2026-08-01 onwards is split by day (one file per calendar day, with `day` set). The changeover falls on a month boundary, so a given month is served entirely one way or the other; a range spanning it returns the earlier months as monthly files followed by a daily file per day.
yearintegerrequiredYear of the data file
monthintegerrequiredMonth of the data file (1-12)
dayintegerDay of the data file (1-31). Present only on daily files, i.e. those covering 2026-08-01 onwards. Absent on monthly files, which cover an entire calendar month.
urlstring<uri>requiredPresigned URL for direct file download (valid for 5 minutes). URLs are served from dataset-specific subdomains, e.g. ohlcv.aperiodic.io, trade-metrics.aperiodic.io, l1-metrics.aperiodic.io, l2-metrics.aperiodic.io, derivative-metrics.aperiodic.io.
{
"files": [
{
"year": 2026,
"month": 6,
"url": "https://ohlcv.aperiodic.io/binance-futures/1h/BTCUSDT/2026-06.parquet?X-Amz-Expires=300&..."
},
{
"year": 2026,
"month": 7,
"url": "https://ohlcv.aperiodic.io/binance-futures/1h/BTCUSDT/2026-07.parquet?X-Amz-Expires=300&..."
},
{
"year": 2026,
"month": 8,
"day": 1,
"url": "https://ohlcv.aperiodic.io/binance-futures/1h/BTCUSDT/2026-08-01.parquet?X-Amz-Expires=300&..."
},
{
"year": 2026,
"month": 8,
"day": 2,
"url": "https://ohlcv.aperiodic.io/binance-futures/1h/BTCUSDT/2026-08-02.parquet?X-Amz-Expires=300&..."
}
]
}
Prefilled with the shared DEMO-KEY and a free preview slice — send the request to see live data, no account required.
/api/v1/data/preview/basis?timestamp=exchange&interval=5m&exchange=binance-futures&symbol=perpetual-BTC-USDT%3AUSDT&start_date=2025-05-01&end_date=2025-05-31Access a curated slice of real production data with just an account — no credit card or subscription required. Pair it with our research notebooks to get started instantly.