Do I need an account?

For all of 2025, yes: a free account gives you your own API key, and the same key keeps working if you upgrade. For a quick look, no: the one-month sample accepts the shared key DEMO-KEY, and the CLI and Python SDK send it for you.

Which markets are free?

BTC, ETH and SOL, plus these RWA perps: SanDisk, Nvidia, Gold, SK hynix, WTI crude oil, Micron, Silver, Nasdaq 100, S&P 500, Tesla. Every contract on those assets counts, on Binance, OKX and Hyperliquid.

Is there free crypto order book data?

Yes, as metrics. A free account gets the L2 imbalance and liquidity datasets (order book imbalance and depth at 5, 10, 20 and 25 levels) for all of 2025 on the free markets, down to 1-minute bars. We don’t sell raw L2 order books.

Can I use the free data commercially?

It comes under the personal licence, so it’s for your own research. For commercial use you need a plan with a commercial licence, Prime Commercial or above.

Free data

Free crypto market data

A free account gets all 220 of our metrics for the whole of 2025, on BTC, ETH, SOL and 10 RWA perps, across Binance, OKX and Hyperliquid, from 1-minute to daily bars. Order book metrics included. If you’d rather look before signing up, every dataset also has a one-month sample you can download with no account at all.

File sizes measured from the preview endpoint on November 5, 2026.

What a free key gets you

Every one of the 19 datasets, order book ones included, for all of 2025.
BTC, ETH and SOL, plus SanDisk, Nvidia, Gold, SK hynix, WTI crude oil, Micron, Silver, Nasdaq 100, S&P 500, Tesla, on Binance, OKX and Hyperliquid.
Bars from 1 minute to 1 day, as parquet, through the API, the Python SDK or the CLI.
1,000 requests a day, and a single request can cover the whole year.
A personal licence, and the same key if you upgrade (pricing).

Or try it with no account

Every dataset has a no-key sample: BTC-USDT on Binance, 5m bars, May 2025. The CLI saves it as parquet and the SDK returns a DataFrame. Swap flow for any dataset id below. With your free key, drop preview=True and pass api_key= instead.

terminal

# 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"

aperiodic flow --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

example.py

# pip install "aperiodic[polars]"
from datetime import date

from aperiodic import get_metrics

flow = get_metrics(
    metric="flow",
    exchange="binance-futures",
    symbol="perpetual-BTC-USDT:USDT",
    interval="5m",
    timestamp="exchange",
    start_date=date(2025, 5, 1),
    end_date=date(2025, 5, 31),
    preview=True,  # no key: the SDK sends the shared DEMO-KEY
)

All 19 datasets

All free for 2025 on the free markets. The file size is the no-key sample (8,928 bars, 6.6 MB for all 19). Click a name for the dataset’s page, where every metric is defined.

Dataset	What it holds	Metrics	No-key sample	Every perp and year
Flow Metrics`flow`	Directional order flow split by taker buy vs. sell, broken into small/medium/large notional segments, with a flow toxicity score.	36	789 KB	Pro
Trade Size`trade_size`	Trade notional split into small (< $100), medium ($100–$1,000), and large (≥ $1,000) segments, with summary statistics for individual trade sizes.	24	556 KB	Pro
Price Range & Distribution`range`	Intrabar high-low price range and full distribution statistics (mean, median, std, skewness, kurtosis) for trade prices within each interval.	10	302 KB	Pro
Impact Metrics`impact`	How much each unit of trading volume moves the price, measured via Amihud illiquidity, Kyle lambda, impact per notional, and large-trade reversal.	5	157 KB	Pro
Up / Down Tick Metrics`updownticks`	Uptick and downtick count, volume, ratios and percentages based on price movement direction.	14	364 KB	Pro
Trade Run Structure`run_structure`	Consecutive same-direction trade run lengths, imbalance, flip rate, and price change on direction flip.	7	182 KB	Pro
Returns & Volatility`returns`	Log-return based metrics: variance, realized volatility, bipower variation, jump ratio, autocorrelation, and trendiness.	6	181 KB	Pro
Slippage`slippage`	How much each trade pays above the best ask (buys) or receives below the best bid (sells) relative to the prevailing quote, aggregated per interval.	10	275 KB	Pro
Basis`basis`	Perpetual futures mark price premium over index price (basis) and last trade price, in absolute and basis-point terms.	8	223 KB	Pro
Funding`funding`	Funding rate and update frequencies for perpetual futures contracts.	3	26 KB	Pro
Open Interest`open_interest`	Open interest values with percentage change, volatility, and OI/price change ratio.	4	272 KB	Pro
Derivative Price`derivative_price`	Snapshot of mark, index, and last trade prices with interval percentage changes and pairwise divergence ratios.	9	512 KB	Pro
Candlesticks`ohlcv`	Open, High, Low, Close, Volume candlestick data with notional volume.	6	159 KB	Pro
VWAP / TWAP`vtwap`	Volume-weighted and time-weighted average prices for precise execution benchmarks.	2	108 KB	Pro
L1 Price`l1_price`	Best bid and ask prices with quantities, midprice, quantity-weighted midprice, time/volume-weighted averages, and quote update frequency.	12	488 KB	Pro
L1 Imbalance`l1_imbalance`	Bid/ask imbalance, ratio, percentages — both instantaneous (last) and averaged over the interval.	10	307 KB	Prime
L1 Liquidity`l1_liquidity`	Spread (absolute and bps), depth, dollar depth — instantaneous and interval-averaged.	14	361 KB	Prime
L2 Order Book Imbalance`l2_imbalance`	Multi-depth (5, 10, 20, 25 levels) order book imbalance, ratio, and averages.	24	760 KB	Prime
L2 Order Book Liquidity`l2_liquidity`	Total bid/ask depth aggregated over 5, 10, 20, 25 order book levels — instantaneous and interval-averaged.	16	598 KB	Prime

Flow Metrics
Directional order flow split by taker buy vs. sell, broken into small/medium/large notional segments, with a flow toxicity score.
flow · 36 metrics · 789 KB sample · every perp and year on Pro
Trade Size
Trade notional split into small (< $100), medium ($100–$1,000), and large (≥ $1,000) segments, with summary statistics for individual trade sizes.
trade_size · 24 metrics · 556 KB sample · every perp and year on Pro
Price Range & Distribution
Intrabar high-low price range and full distribution statistics (mean, median, std, skewness, kurtosis) for trade prices within each interval.
range · 10 metrics · 302 KB sample · every perp and year on Pro
Impact Metrics
How much each unit of trading volume moves the price, measured via Amihud illiquidity, Kyle lambda, impact per notional, and large-trade reversal.
impact · 5 metrics · 157 KB sample · every perp and year on Pro
Up / Down Tick Metrics
Uptick and downtick count, volume, ratios and percentages based on price movement direction.
updownticks · 14 metrics · 364 KB sample · every perp and year on Pro
Trade Run Structure
Consecutive same-direction trade run lengths, imbalance, flip rate, and price change on direction flip.
run_structure · 7 metrics · 182 KB sample · every perp and year on Pro
Returns & Volatility
Log-return based metrics: variance, realized volatility, bipower variation, jump ratio, autocorrelation, and trendiness.
returns · 6 metrics · 181 KB sample · every perp and year on Pro
Slippage
How much each trade pays above the best ask (buys) or receives below the best bid (sells) relative to the prevailing quote, aggregated per interval.
slippage · 10 metrics · 275 KB sample · every perp and year on Pro
Basis
Perpetual futures mark price premium over index price (basis) and last trade price, in absolute and basis-point terms.
basis · 8 metrics · 223 KB sample · every perp and year on Pro
Funding
Funding rate and update frequencies for perpetual futures contracts.
funding · 3 metrics · 26 KB sample · every perp and year on Pro
Open Interest
Open interest values with percentage change, volatility, and OI/price change ratio.
open_interest · 4 metrics · 272 KB sample · every perp and year on Pro
Derivative Price
Snapshot of mark, index, and last trade prices with interval percentage changes and pairwise divergence ratios.
derivative_price · 9 metrics · 512 KB sample · every perp and year on Pro
Candlesticks
Open, High, Low, Close, Volume candlestick data with notional volume.
ohlcv · 6 metrics · 159 KB sample · every perp and year on Pro
VWAP / TWAP
Volume-weighted and time-weighted average prices for precise execution benchmarks.
vtwap · 2 metrics · 108 KB sample · every perp and year on Pro
L1 Price
Best bid and ask prices with quantities, midprice, quantity-weighted midprice, time/volume-weighted averages, and quote update frequency.
l1_price · 12 metrics · 488 KB sample · every perp and year on Pro
L1 Imbalance
Bid/ask imbalance, ratio, percentages — both instantaneous (last) and averaged over the interval.
l1_imbalance · 10 metrics · 307 KB sample · every perp and year on Prime
L1 Liquidity
Spread (absolute and bps), depth, dollar depth — instantaneous and interval-averaged.
l1_liquidity · 14 metrics · 361 KB sample · every perp and year on Prime
L2 Order Book Imbalance
Multi-depth (5, 10, 20, 25 levels) order book imbalance, ratio, and averages.
l2_imbalance · 24 metrics · 760 KB sample · every perp and year on Prime
L2 Order Book Liquidity
Total bid/ask depth aggregated over 5, 10, 20, 25 order book levels — instantaneous and interval-averaged.
l2_liquidity · 16 metrics · 598 KB sample · every perp and year on Prime

What a paid plan adds

Every other perp and every other year needs a plan that includes the dataset: Pro for 15 of them, Prime for the 4 order book ones. Plans cover Binance futures, OKX perps and Hyperliquid perps, from 1-minute to daily bars, timestamped by the exchange or by when each update reached us. Pro keeps 5 years of history and Prime keeps all of it, including perps that have since been delisted (pricing).

Free and live, 15 minutes behind

If you want something live, the markets dashboard shows the perps on Binance, OKX and Hyperliquid with a 15-minute delay. The JSON behind it is public too, at /api/v1/public/markets/board, rate limited per address.

Questions

Do I need an account?: For all of 2025, yes: a free account gives you your own API key, and the same key keeps working if you upgrade. For a quick look, no: the one-month sample accepts the shared key DEMO-KEY, and the CLI and Python SDK send it for you.
Which markets are free?: BTC, ETH and SOL, plus these RWA perps: SanDisk, Nvidia, Gold, SK hynix, WTI crude oil, Micron, Silver, Nasdaq 100, S&P 500, Tesla. Every contract on those assets counts, on Binance, OKX and Hyperliquid.
Is there free crypto order book data?: Yes, as metrics. A free account gets the L2 imbalance and liquidity datasets (order book imbalance and depth at 5, 10, 20 and 25 levels) for all of 2025 on the free markets, down to 1-minute bars. We don’t sell raw L2 order books.
Can I use the free data commercially?: It comes under the personal licence, so it’s for your own research. For commercial use you need a plan with a commercial licence, Prime Commercial or above.