Name: Basis
Creator: Aperiodic
License: https://aperiodic.io/terms-of-service

Basis

Perpetual futures mark price premium over index price (basis) and last trade price, in absolute and basis-point terms.

Code API Docs Try It

basis_bps

Basis (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.

mark_price_spread_bps

Mark-Price Spread (bps)

Mark-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_mean

Mean Basis

Mean 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_std

Basis Std Dev (bps)

Basis 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_std

Mark-Price Spread Std Dev (bps)

This 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.

Endpoint

/api/v1/data/basis

Query Parameters

timestampreqstring

string

Timestamp source. 'exchange' uses the exchange-reported timestamp, 'true' uses actual arrival time at our servers.

exchangetrue

intervalreqstring

string

Aggregation time interval for the data.

1m5m15m30m1h4h1d

exchangereqstring

string

Source exchange for the data.

binance-futuresokx-perpshyperliquid-perps

symbolreqstring

string

Trading pair symbol in the format of Atlas' universal symbology: https://github.com/aperiodic-io/atlas

start_datereqstring<date>

string<date>

Start date for the data range (YYYY-MM-DD format). Data is partitioned by year and month.

end_datereqstring<date>

string<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 file covering the range — one per month before 2026-08-01, one per day from 2026-08-01 onwards

Schema

filesobject[]required

Files 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.

yearintegerrequired

Year of the data file

monthintegerrequired

Month of the data file (1-12)

dayinteger

Day 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>required

Presigned 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.

Example

{
  "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&..."
    }
  ]
}

Try It

Prefilled with the shared DEMO-KEY and a free preview slice — send the request to see live data, no account required.

timestamp*

interval*

exchange*

symbol*

Suggestions shown — any valid value accepted

start_date*

Suggestions shown — any valid value accepted

end_date*

Suggestions shown — any valid value accepted

Authentication

X-API-KEY*

GET

/api/v1/data/preview/basis?timestamp=exchange&interval=5m&exchange=binance-futures&symbol=perpetual-BTC-USDT%3AUSDT&start_date=2025-05-01&end_date=2025-05-31

Response will appear here

Try Free Preview Data

Access 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.

Use with AI Agents

Access Basis programmatically via our Python SDK and REST API — optimised for autonomous research workflows.

Get Started

Subscribe to get full API access. Start querying all datasets in minutes.

Basis

Perpetual futures mark price premium over index price (basis) and last trade price, in absolute and basis-point terms.

Code API Docs Try It

basis_bps

Basis (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.

mark_price_spread_bps

Mark-Price Spread (bps)

Mark-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_mean

Mean Basis

Mean 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_std

Basis Std Dev (bps)

Basis 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_std

Mark-Price Spread Std Dev (bps)

This 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.

Endpoint

/api/v1/data/basis

Query Parameters

timestampreqstring

string

Timestamp source. 'exchange' uses the exchange-reported timestamp, 'true' uses actual arrival time at our servers.

exchangetrue

intervalreqstring

string

Aggregation time interval for the data.

1m5m15m30m1h4h1d

exchangereqstring

string

Source exchange for the data.

binance-futuresokx-perpshyperliquid-perps

symbolreqstring

string

Trading pair symbol in the format of Atlas' universal symbology: https://github.com/aperiodic-io/atlas

start_datereqstring<date>

string<date>

Start date for the data range (YYYY-MM-DD format). Data is partitioned by year and month.

end_datereqstring<date>

string<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 file covering the range — one per month before 2026-08-01, one per day from 2026-08-01 onwards

Schema

filesobject[]required

yearintegerrequired

Year of the data file

monthintegerrequired

Month of the data file (1-12)

dayinteger

Day 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>required

Example

{
  "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&..."
    }
  ]
}

Try It

Prefilled with the shared DEMO-KEY and a free preview slice — send the request to see live data, no account required.

timestamp*

interval*

exchange*

symbol*

Suggestions shown — any valid value accepted

start_date*

Suggestions shown — any valid value accepted

end_date*

Suggestions shown — any valid value accepted

Authentication

X-API-KEY*

GET

/api/v1/data/preview/basis?timestamp=exchange&interval=5m&exchange=binance-futures&symbol=perpetual-BTC-USDT%3AUSDT&start_date=2025-05-01&end_date=2025-05-31

Response will appear here

Try Free Preview Data

Access 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.

Use with AI Agents

Access Basis programmatically via our Python SDK and REST API — optimised for autonomous research workflows.

Get Started

Subscribe to get full API access. Start querying all datasets in minutes.