# General
What is Tardis.dev and what is your unique value proposition?
Tardis.dev provides tick-level historical and real-time cryptocurrency market data from 50+ exchanges and offers:
* access to [high frequency historical data](https://docs.tardis.dev/data#what-does-high-frequency-historical-data-mean) including the most granular tick level order book updates and trades for both [derivatives and top spot cryptocurrency exchanges](#which-exchanges-instruments-and-currency-pairs-are-supported)
* [non standard data types](https://docs.tardis.dev/data#what-data-types-do-you-support): historical funding, open interest, indexes, liquidations and more
* fast and convenient data access both via [API](https://docs.tardis.dev/api/quickstart) and [downloadable CSV files](https://docs.tardis.dev/downloadable-csv-files/overview)
* data [sourced from real-time WS market data feeds](https://docs.tardis.dev/data#why-data-source-matters-websocket-feeds-vs-rest-endpoints) with complete [control and transparency](https://docs.tardis.dev/historical-data-details/overview#market-data-collection-overview) over how we record the data
* [exchange-native](https://docs.tardis.dev/data#what-is-a-difference-between-exchange-native-and-normalized-data-format) and [normalized data format](https://docs.tardis.dev/data#what-is-a-difference-between-exchange-native-and-normalized-data-format) support
* [time-machine market replay](#how-does-time-machine-market-replay-work) allowing reconstruction of state of the limit order book at any given moment in time across [all supported cryptocurrency markets](https://docs.tardis.dev/historical-data-details/overview)
* [always available market data backup](#what-is-your-infrastructure-setup)
* [fair, transparent pricing](https://docs.tardis.dev/billing-and-subscriptions#do-you-provide-discounts) with discounts for solo trades, small prop shops and academic researchers
* [consolidated real-time market data streaming](#do-you-support-consolidated-real-time-market-data-streaming) support via Tardis.dev open source libraries that connect directly to exchanges' public WebSocket APIs (no API key required)
* [professional support](#what-does-professional-support-mean)
**Data use cases**
* market microstructure and order book dynamics research
* trading execution optimization
* tick-level granularity market simulation
* liquidity and lead-lag analysis
* backtesting and optimization of trading strategies
* full historical order book reconstruction at any given point in time
* training machine learning models
* alpha generation
* designing quantitative models
* academic research
* data visualizations
Which exchanges, instruments and currency pairs are supported?
Over 50 000 distinct instruments & currency pairs across leading derivatives and spot cryptocurrency exchanges are supported. We collect and provide data for all instruments & currency pairs available on a given exchange, with some exceptions for spot exchanges where we collect high-cap currency pairs only (due to exchange API limitations).
{% hint style="info" %}
See [historical data details](https://docs.tardis.dev/historical-data-details/overview#per-exchange-historical-data-details) for each supported exchange.
{% endhint %}
* Binance
* [Binance USDS-M Futures](https://docs.tardis.dev/historical-data-details/binance-futures)
* [Binance COIN Futures](https://docs.tardis.dev/historical-data-details/binance-delivery)
* [Binance European Options](https://docs.tardis.dev/historical-data-details/binance-european-options)
* [Binance Spot](https://docs.tardis.dev/historical-data-details/binance)
* [Binance US](https://docs.tardis.dev/historical-data-details/binance-us)
* OKX
* [OKX Futures](https://docs.tardis.dev/historical-data-details/okex-futures)
* [OKX Swap](https://docs.tardis.dev/historical-data-details/okex-swap)
* [OKX Options](https://docs.tardis.dev/historical-data-details/okex-options)
* [OKX Spot](https://docs.tardis.dev/historical-data-details/okex)
* [OKX Nitro Spreads](https://docs.tardis.dev/historical-data-details/okex-spreads)
* Bybit
* [Bybit Derivatives](https://docs.tardis.dev/historical-data-details/bybit)
* [Bybit Spot](https://docs.tardis.dev/historical-data-details/bybit-spot)
* [Bybit Options](https://docs.tardis.dev/historical-data-details/bybit-options)
* [BitMEX](https://docs.tardis.dev/historical-data-details/bitmex)
* [Deribit](https://docs.tardis.dev/historical-data-details/deribit)
* [Hyperliquid](https://docs.tardis.dev/historical-data-details/hyperliquid)
* HTX
* [HTX Coin-M Futures](https://docs.tardis.dev/historical-data-details/huobi-dm)
* [HTX Coin-M Perpetual](https://docs.tardis.dev/historical-data-details/huobi-dm-swap)
* [HTX USDT-M Contracts](https://docs.tardis.dev/historical-data-details/huobi-dm-linear-swap)
* [HTX Spot](https://docs.tardis.dev/historical-data-details/huobi)
* Coinbase
* [Coinbase Exchange](https://docs.tardis.dev/historical-data-details/coinbase)
* [Coinbase International](https://docs.tardis.dev/historical-data-details/coinbase-international)
* [Kraken Futures](https://docs.tardis.dev/historical-data-details/cryptofacilities)
* [Kraken](https://docs.tardis.dev/historical-data-details/kraken)
* Bitfinex
* [Bitfinex Derivatives](https://docs.tardis.dev/historical-data-details/bitfinex-derivatives)
* [Bitfinex](https://docs.tardis.dev/historical-data-details/bitfinex)
* [dYdX v4](https://docs.tardis.dev/historical-data-details/dydx-v4)
* Gate.io
* [Gate.io Futures](https://docs.tardis.dev/historical-data-details/gate-io-futures)
* [Gate.io](https://docs.tardis.dev/historical-data-details/gate-io)
* Bitget
* [Bitget Futures](https://docs.tardis.dev/historical-data-details/bitget-futures)
* [Bitget Spot](https://docs.tardis.dev/historical-data-details/bitget)
* KuCoin
* [KuCoin Futures](https://docs.tardis.dev/historical-data-details/kucoin-futures)
* [KuCoin Spot](https://docs.tardis.dev/historical-data-details/kucoin)
* [Crypto.com](https://docs.tardis.dev/historical-data-details/crypto-com)
* [Bitstamp](https://docs.tardis.dev/historical-data-details/bitstamp)
* [Gemini](https://docs.tardis.dev/historical-data-details/gemini)
* [WOO X](https://docs.tardis.dev/historical-data-details/woo-x)
* [Upbit](https://docs.tardis.dev/historical-data-details/upbit)
* [Phemex](https://docs.tardis.dev/historical-data-details/phemex)
* [Delta Exchange](https://docs.tardis.dev/historical-data-details/delta)
* [AscendEX (BitMax)](https://docs.tardis.dev/historical-data-details/ascendex)
* [Blockchain.com](https://docs.tardis.dev/historical-data-details/blockchain-com)
* [Bitnomial](https://docs.tardis.dev/historical-data-details/bitnomial)
* [bitFlyer](https://docs.tardis.dev/historical-data-details/bitflyer)
* [HitBTC](https://docs.tardis.dev/historical-data-details/hitbtc)
* [Poloniex](https://docs.tardis.dev/historical-data-details/poloniex)
* Delisted exchanges
* [FTX](https://docs.tardis.dev/historical-data-details/ftx)
* [FTX US](https://docs.tardis.dev/historical-data-details/ftx-us)
* [OKCoin](https://docs.tardis.dev/historical-data-details/okcoin)
* [CoinFLEX](https://docs.tardis.dev/historical-data-details/coinflex)
* [Binance Jersey](https://docs.tardis.dev/historical-data-details/binance-jersey)
* [Binance DEX](https://docs.tardis.dev/historical-data-details/binance-dex)
* [HTX Options](https://docs.tardis.dev/historical-data-details/huobi-dm-options)
* [dYdX](https://docs.tardis.dev/historical-data-details/dydx)
* [Serum DEX](https://docs.tardis.dev/historical-data-details/serum)
* [Mango Markets DEX](https://docs.tardis.dev/historical-data-details/mango)
* [Star Atlas DEX](https://docs.tardis.dev/historical-data-details/star-atlas)
Do you provide discounts?
We provide discounts via [different subscription types](https://docs.tardis.dev/billing-and-subscriptions#what-are-the-differences-between-subscription-types).
Do you offer free trials?
Yes, if you'd like to test the service (data quality, coverage, API performance etc.) we offer generous free trials. Simply [reach out to us](https://tardis.dev/#contact) and we'll set up trial account for you.
What does professional support mean?
Our support team has in-depth knowledge of market data and exchange API peculiarities, plus programming and data analysis expertise. You get answers straight from people whose day-to-day job is overseeing and maintaining market data collection processes and infrastructure.
For [business subscriptions](https://docs.tardis.dev/billing-and-subscriptions#what-are-the-differences-between-subscription-types) we provide priority email support with 8-12 business hours initial response time.
For [pro subscriptions](https://docs.tardis.dev/billing-and-subscriptions#what-are-the-differences-between-subscription-types) we provide email support with 24-48 business hours initial response time.
For [academic and solo subscriptions](https://docs.tardis.dev/billing-and-subscriptions#what-are-the-differences-between-subscription-types) there is no dedicated support provided, only self-service.
Why would I use your services if I can collect data by myself?
Since cryptocurrency exchanges' market data APIs are public, anyone can use them to collect data, but it's a time-consuming and resource-intensive undertaking (exchanges we support publish \~1000GB of new data every day) that requires investment in [proper infrastructure](#what-is-your-infrastructure-setup), constant monitoring and oversight (exchange API changes, rate-limiting monitoring, new exchange integrations, unexpected connection issues, latency monitoring, etc.), not to mention implementation costs of data collection, storage, and distribution services.
We think our offering saves you time and money compared to building an in-house solution, letting you focus on trading and research rather than data infrastructure. See our [data types](https://docs.tardis.dev/data#what-data-types-do-you-support), [data sourcing approach](https://docs.tardis.dev/data#why-data-source-matters-websocket-feeds-vs-rest-endpoints), and [pricing](#do-you-provide-discounts) for details.
How can I download the data?
You can access historical market data via [API](https://docs.tardis.dev/api/quickstart) which provides raw data in [exchange native format](https://docs.tardis.dev/data#what-is-a-difference-between-exchange-native-and-normalized-data-format) or download [CSV datasets](https://docs.tardis.dev/downloadable-csv-files/overview) with [trades](https://docs.tardis.dev/downloadable-csv-files/data-types#trades), [incremental order book L2 updates](https://docs.tardis.dev/downloadable-csv-files/data-types#incremental_book_l2), order book snapshots ([top 25](https://docs.tardis.dev/downloadable-csv-files/data-types#book_snapshot_25) and [top 5](https://docs.tardis.dev/downloadable-csv-files/data-types#book_snapshot_5)), [options chains](https://docs.tardis.dev/downloadable-csv-files/data-types#options_chain), [quotes](https://docs.tardis.dev/downloadable-csv-files/data-types#quotes), [book tickers](https://docs.tardis.dev/downloadable-csv-files/data-types#book_ticker), [derivative tickers](https://docs.tardis.dev/downloadable-csv-files/data-types#derivative_ticker) (open interest, funding, mark price, index price) and [liquidations](https://docs.tardis.dev/downloadable-csv-files/data-types#liquidations).
[Our client libs](https://docs.tardis.dev/api/quickstart) provide data in [normalized format](https://docs.tardis.dev/data#what-is-a-difference-between-exchange-native-and-normalized-data-format) as well, which can be more flexible than CSV datasets for some use cases but also slower to download due to on-demand, client-side data normalization overhead in comparison to ready to download CSV files.
{% hint style="info" %}
**Replay API** supports custom time windows with minute precision (e.g., `2024-01-15T09:30:00.000Z` to `2024-01-15T16:00:00.000Z`). **CSV datasets** are available as daily files.
{% endhint %}
How far back is historical data available?
Data is available since **2019-03-30** for majority of the supported exchanges (that existed at that time).
| **exchange** | **available since** | **available until** |
| ---------------------------------------------------------------------------------------------------- | ------------------- | ------------------- |
| [Binance USDS-M Futures](https://docs.tardis.dev/historical-data-details/binance-futures) | 2019-11-17 | |
| [Binance COIN Futures](https://docs.tardis.dev/historical-data-details/binance-delivery) | 2020-06-16 | |
| [Binance European Options](https://docs.tardis.dev/historical-data-details/binance-european-options) | 2023-06-15 | |
| [Binance Spot](https://docs.tardis.dev/historical-data-details/binance) | 2019-03-30 | |
| [Binance US](https://docs.tardis.dev/historical-data-details/binance-us) | 2019-09-25 | |
| [OKX Futures](https://docs.tardis.dev/historical-data-details/okex-futures) | 2019-03-30 | |
| [OKX Swap](https://docs.tardis.dev/historical-data-details/okex-swap) | 2019-03-30 | |
| [OKX Options](https://docs.tardis.dev/historical-data-details/okex-options) | 2020-02-01 | |
| [OKX Spot](https://docs.tardis.dev/historical-data-details/okex) | 2019-03-30 | |
| [OKX Nitro Spreads](https://docs.tardis.dev/historical-data-details/okex-spreads) | 2023-12-22 | |
| [Bybit Derivatives](https://docs.tardis.dev/historical-data-details/bybit) | 2019-11-07 | |
| [Bybit Spot](https://docs.tardis.dev/historical-data-details/bybit-spot) | 2021-12-04 | |
| [Bybit Options](https://docs.tardis.dev/historical-data-details/bybit-options) | 2023-04-05 | |
| [BitMEX](https://docs.tardis.dev/historical-data-details/bitmex) | 2019-03-30 | |
| [Deribit](https://docs.tardis.dev/historical-data-details/deribit) | 2019-03-30 | |
| [Hyperliquid](https://docs.tardis.dev/historical-data-details/hyperliquid) | 2024-10-29 | |
| [HTX Coin-M Futures](https://docs.tardis.dev/historical-data-details/huobi-dm) | 2019-11-19 | |
| [HTX Coin-M Perpetual](https://docs.tardis.dev/historical-data-details/huobi-dm-swap) | 2020-03-28 | |
| [HTX USDT-M Contracts](https://docs.tardis.dev/historical-data-details/huobi-dm-linear-swap) | 2020-10-30 | |
| [HTX Spot](https://docs.tardis.dev/historical-data-details/huobi) | 2019-11-19 | |
| [Coinbase Exchange](https://docs.tardis.dev/historical-data-details/coinbase) | 2019-03-30 | |
| [Coinbase International](https://docs.tardis.dev/historical-data-details/coinbase-international) | 2024-10-31 | |
| [Kraken Futures](https://docs.tardis.dev/historical-data-details/cryptofacilities) | 2019-03-30 | |
| [Kraken](https://docs.tardis.dev/historical-data-details/kraken) | 2019-06-04 | |
| [Bitfinex Derivatives](https://docs.tardis.dev/historical-data-details/bitfinex-derivatives) | 2019-09-14 | |
| [Bitfinex](https://docs.tardis.dev/historical-data-details/bitfinex) | 2019-05-23 | |
| [dYdX v4](https://docs.tardis.dev/historical-data-details/dydx-v4) | 2024-08-23 | |
| [Gate.io Futures](https://docs.tardis.dev/historical-data-details/gate-io-futures) | 2020-07-01 | |
| [Gate.io](https://docs.tardis.dev/historical-data-details/gate-io) | 2020-07-01 | |
| [Bitget Futures](https://docs.tardis.dev/historical-data-details/bitget-futures) | 2024-11-08 | |
| [Bitget Spot](https://docs.tardis.dev/historical-data-details/bitget) | 2024-11-08 | |
| [KuCoin Futures](https://docs.tardis.dev/historical-data-details/kucoin-futures) | 2024-01-25 | |
| [KuCoin Spot](https://docs.tardis.dev/historical-data-details/kucoin) | 2022-08-16 | |
| [Crypto.com](https://docs.tardis.dev/historical-data-details/crypto-com) | 2022-06-01 | |
| [Bitstamp](https://docs.tardis.dev/historical-data-details/bitstamp) | 2019-03-30 | |
| [Gemini](https://docs.tardis.dev/historical-data-details/gemini) | 2019-08-30 | |
| [WOO X](https://docs.tardis.dev/historical-data-details/woo-x) | 2023-01-20 | |
| [Upbit](https://docs.tardis.dev/historical-data-details/upbit) | 2021-03-03 | |
| [Phemex](https://docs.tardis.dev/historical-data-details/phemex) | 2020-03-17 | |
| [Delta Exchange](https://docs.tardis.dev/historical-data-details/delta) | 2020-03-30 | |
| [AscendEX (BitMax)](https://docs.tardis.dev/historical-data-details/ascendex) | 2021-03-28 | |
| [Blockchain.com](https://docs.tardis.dev/historical-data-details/blockchain-com) | 2023-02-23 | |
| [Bitnomial](https://docs.tardis.dev/historical-data-details/bitnomial) | 2023-01-13 | |
| [bitFlyer](https://docs.tardis.dev/historical-data-details/bitflyer) | 2019-08-30 | |
| [HitBTC](https://docs.tardis.dev/historical-data-details/hitbtc) | 2019-11-19 | |
| [Poloniex](https://docs.tardis.dev/historical-data-details/poloniex) | 2020-07-01 | |
| [FTX](https://docs.tardis.dev/historical-data-details/ftx) | 2019-08-01 | 2022-11-13 |
| [FTX US](https://docs.tardis.dev/historical-data-details/ftx-us) | 2020-05-22 | 2022-11-13 |
| [OKCoin](https://docs.tardis.dev/historical-data-details/okcoin) | 2019-11-19 | 2025-10-01 |
| [CoinFLEX](https://docs.tardis.dev/historical-data-details/coinflex) | 2020-07-14 | 2023-04-07 |
| [Binance Jersey](https://docs.tardis.dev/historical-data-details/binance-jersey) | 2019-10-30 | 2020-11-10 |
| [Binance DEX](https://docs.tardis.dev/historical-data-details/binance-dex) | 2019-06-04 | 2022-10-04 |
| [HTX Options](https://docs.tardis.dev/historical-data-details/huobi-dm-options) | 2021-02-01 | 2021-06-26 |
| [dYdX](https://docs.tardis.dev/historical-data-details/dydx) | 2021-04-06 | 2024-10-30 |
| [Serum DEX](https://docs.tardis.dev/historical-data-details/serum) | 2021-06-23 | 2022-11-13 |
| [Mango Markets DEX](https://docs.tardis.dev/historical-data-details/mango) | 2022-01-19 | 2022-10-14 |
| [Star Atlas DEX](https://docs.tardis.dev/historical-data-details/star-atlas) | 2021-10-09 | 2022-09-05 |
Do you provide historical market data in CSV flat files?
Yes, see [downloadable CSV files documentation](https://docs.tardis.dev/downloadable-csv-files/overview) for more details.
What programming languages are supported?
Any programming language that can communicate using HTTPS can communicate with our [HTTP API](https://docs.tardis.dev/api/http-api-reference).
We provide official [Python](https://docs.tardis.dev/python-client/quickstart) and [Node.js](https://docs.tardis.dev/node-client/quickstart) clients for accessing tick-level historical market data.
Finally, our open source, locally runnable [tardis-machine](https://docs.tardis.dev/tardis-machine/quickstart) server with built-in local data caching provides market data normalization, custom order book snapshot capabilities, and real-time market data streaming support that connects directly to exchanges' WebSocket APIs. It provides both streaming HTTP and WebSocket endpoints returning market data for whole time periods (in contrast to Tardis.dev [HTTP API](https://docs.tardis.dev/api/http-api-reference), where a single call returns data for a single minute time period) and is available via npm and as a Docker image.
What API protocols can be used to access market data?
Historical market data provided by [HTTP API](https://docs.tardis.dev/api/http-api-reference) can be accessed via HTTPS.
Locally runnable [tardis-machine](https://docs.tardis.dev/tardis-machine/quickstart) server provides both HTTP and WebSocket based APIs for accessing both historical and real-time market data.
How does time-machine market replay work?
Exchanges' market data WebSocket APIs are designed to publish real-time feeds and not historical ones. Locally runnable [tardis-machine server's WebSocket API](https://docs.tardis.dev/tardis-machine/replaying-historical-data#websocket-ws-replay-exchange-exchange-and-from-fromdate-and-to-todate) bridges that gap and allows "replaying" historical market data from any given past point in time with the same data format and 'subscribe' logic as real-time exchanges' APIs. In many cases existing exchanges' WebSocket clients can be used to connect to this endpoint just by changing URL, and receive market data in [exchange-native](https://docs.tardis.dev/data#what-is-a-difference-between-exchange-native-and-normalized-data-format) format for date ranges specified in URL query string params.
Do you support consolidated real-time market data streaming?
We do not provide a hosted real-time market data API as we think that, given everyone can access exchanges' APIs directly for free without restrictions, relying on a 3rd party for such a crucial piece of infrastructure does not make sense (additional latency and another [SPOF](https://en.wikipedia.org/wiki/Single_point_of_failure)).
Instead we developed [locally runnable (self hosted) server and open source libraries](https://docs.tardis.dev/api/quickstart) that offer consolidated real-time normalized market data streaming capabilities, connect directly to exchanges' WebSocket APIs and are completely free to use.
Are there any rate-limits for the API?
There are no API rate limits for the [downloadable CSV files API](https://docs.tardis.dev/downloadable-csv-files/overview).
[Raw data replay API](https://docs.tardis.dev/api/quickstart) for professional level subscriptions is limited to 30 million requests per day and up to 60 concurrent requests. API key can be used only from a single IP address at the same time.
For business level subscriptions there are no rate limits for raw data replay API as long as your behavior does not negatively impact other customers API usage experience. If that's the case, we'll contact you via email and do our best to help sort it out - in most cases it's a download client bug that repeatedly downloads the same data in a loop.
If you exceed the daily rate limit, the API will return HTTP 403 responses for the next 24 hours. [Contact support](https://tardis.dev/#contact) if you believe this happened in error or need assistance.
A single replay call can generate many underlying requests — one for each minute of replayed data per channel/symbol combination. To minimize request usage, request data for multiple symbols at once rather than one-by-one — passing an empty `symbols` array (`[]`) returns data for all active symbols in a single replay.
How do I obtain my API key?
API key can be obtained on [Tardis.dev](https://tardis.dev/) website via [order form](https://tardis.dev/#order). You'll receive it via email after successful order.
How can I rotate or reset my API key?
[Contact us](https://tardis.dev/#contact) and we will generate a new API key for you. The previous key is invalidated immediately upon rotation. If your key was compromised, contact us as soon as possible.
What is your infrastructure setup?
**Market data collection**
Highly available [Google Cloud Platform Kubernetes Clusters](https://cloud.google.com/kubernetes-engine/) located in London, UK (europe-west2 region) and Tokyo, Japan (asia-northeast1 region)
**Market data storage**
Two independent, geo-redundant, highly durable storage services
**Market data distribution**
High performance API servers deployed across network of data centers around the globe
What is premium connectivity?
For Pro and Business subscriptions, we provide premium connectivity powered by [Cloudflare Argo Smart Routing](https://www.cloudflare.com/application-services/products/argo-smart-routing/). Argo Smart Routing optimizes the network path for API requests by routing traffic through Cloudflare's private network backbone instead of the congested public internet.
Argo routes API traffic through Cloudflare's private backbone instead of the public internet, which reduces latency, improves reliability through automatic failover around congestion and outages, and gives more predictable response times regardless of your location.
Do you provide an SLA?
We do not have a formal SLA in place yet, but all infrastructure is set up to provide the highest availability possible on both data collection and distribution sides with a geo-redundant setup. Both data collection services and public APIs are constantly monitored from multiple locations and our team is immediately notified in case of any issue. We don't perform maintenance that would affect API availability, but in very rare circumstances, if that happens, we'll communicate it in advance. If a formal SLA is something your business requires, [contact us](https://tardis.dev/#contact).