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From raw order flow to a ranked, backtestable signal — every step in runnable code.

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Alpha Discovery

We define Directional Alpha as a signal that exhibits a consistent positive or negative relationship with forward returns.

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  1. 01

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  2. 02

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    Swap the preview key for your own and the same code pulls the full history through the Python package or the API.

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Intro to Aperiodic Flow Metrics

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This notebook introduces order-flow analytics with the `aperiodic` Python package. We focus on a single large-cap instrument — Binance BTC perpetuals (`perpetual-BTC-USDT:USDT`) — over the exact six-month window from September 1, 2025 through February 28, 2026, using 1-hour observations.

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Find new alpha

From raw order flow to a ranked, backtestable signal — every step in runnable code.

Run on preview data
Browse catalog
Derivative Price

Derivative Price

Snapshot of mark, index, and last trade prices with interval percentage changes and pairwise divergence ratios.

CodeAPI DocsTry It

Need the ticks behind this metric? Prime + Raw includes raw mark price, index price, trades.

mark_price

Mark Price

Mark Price is the exchange reference price used for risk, liquidation, and many internal controls.

It often matters more than the last traded print when you care about margin behavior or the true state of the derivatives venue.

index_price

Index Price

Index Price represents the external reference basket that the derivative is ultimately trying to track.

It provides the cleanest anchor for judging whether the contract is rich, cheap, or simply reacting to the broader market.

last_price_pct_change

Last Price % Change

Last Price % Change gives the immediate traded move seen by market participants on the venue.

It is the most reactive of the price-change measures and therefore tends to pick up local bursts before slower references catch up.

mark_index_pct_change_ratio

Mark/Index % Change Ratio

This ratio compares how quickly the mark price moved relative to the underlying index reference.

Values above or below one indicate that the venue mark is leading or lagging the external market move.

mark_last_pct_change_ratio

Mark/Last % Change Ratio

Mark/Last % Change Ratio compares the stability-focused mark with the more reactive last trade.

When the two diverge meaningfully, the venue is effectively saying that the latest print should not be taken fully at face value for risk purposes.

Endpoint

/api/v1/data/derivative_price

Category

Derivatives

Intervals
1m5m15m30m1h4h1d
Exchanges
binance-futuresokx-perpshyperliquid-perps
Built from
Raw mark price →Raw index price →Raw trades →
Fields9
last_priceLast PriceLast traded price observed in the interval
index_priceIndex PriceLast index price observed in the interval
mark_priceMark PriceLast mark price observed in the interval
last_price_pct_changeLast Price % ChangePercentage change from the first last price to the final last price in the interval
index_price_pct_changeIndex Price % ChangePercentage change from the first index price to the final index price in the interval
mark_price_pct_changeMark Price % ChangePercentage change from the first mark price to the final mark price in the interval
mark_index_pct_change_ratioMark/Index % Change RatioMark-price return divided by index-price return over the interval
mark_last_pct_change_ratioMark/Last % Change RatioMark-price return divided by last-price return over the interval
index_last_pct_change_ratioIndex/Last % Change RatioIndex-price return divided by last-price return over the interval
Example Request
# 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 derivative_price --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"

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.

Suggestions shown — any valid value accepted
Suggestions shown — any valid value accepted
Suggestions shown — any valid value accepted
Authentication
GET/api/v1/data/preview/derivative_price?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
Aperiodic

Crypto microstructure, liquidity & flow metrics — built from hundreds of terabytes of raw data, distilled into point-in-time metrics you can pull as parquet files. Plus the raw trades, quotes and derivatives data behind them.

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Registered in Ireland · Company No. 815273

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