I’ve been looking for a broker that has an API for index futures and ideally also futures options. I’m looking to use the API to build a customized view of my risk based on balances, positions, and market conditions.
Searching the algotrading sub I found many API-related posts, but then when I actually read them and their comments, I found they’re often lacking in real substance. It turns out many brokers or data services that have APIs don’t actually support index futures and options via the API, and instead they focus on equities, forex, or cypto. So here’s the list of what I’ve found so far. This isn’t a review of these brokers or APIs and note that I have a specific application in mind (index futures and futures options). Perhaps you’re looking for an API for equities, or you just want data and not a broker, in which case there may be a few options. Also, I’m based in the US so I didn’t really look for brokers or platforms outside the US.
If you have experience with these APIs, please chime in with your thoughts. Also, I may have missed some brokers or platforms. If I did or if you see anything that needs correction please let me know.

Platform	Notes
ADM Investor Services	No API
Ally Invest	Does not support futures instruments
Alpaca	Only supports US Equities
Alpha Vantage	Does not support futures instruments
AMP	Broker with a huge number of platforms available including some with APIs
ApexFutures	No API
Arcade Trader	No API
AvaTrade	Does not support futures instruments
Backtrader	Not a data feed; otherwise looks cool but also looks like a one-man shop
Cannon Trading	Broker with a variety of platforms, some have API access such as TT
Centerpoint	No API
Charles Schwab	API does not support futures instruments
Cobra	No API
Daniels Trading	No API
Discount Trading	Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
Edge Clear	Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
Eroom	Now part of Dashprime. Offer a variety of APIs including CQG, TT, CBOE's Silexx, and others via FIX.
ETNA Trader	Only supports equities, options (including multi-legs), ETFs, Mutual Funds (Forex with cryptocurrencies coming soon)
ETrade	API seems robust but OAuth authorization needs to be refreshed via login once per 24 hours
Futures Online	No API
Gain Capital Futures	API available, based on .NET; unsure if they are open to retail clients
GFF Brokers	Broker with a large number of platforms including some with API access
High Ridge Futures	Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
iBroker	API available; contact them for more info
IEX Cloud	Looks great but does not support futures instruments
Infinity Futures	JSON API available; contact them for more info
Interactive Brokers	Client Web API looks promising if clunky
Intrinio	Supports futures instruments but is expensive
Koyfin	No API
Lightspeed	C++ API available
marketstack	API for equities available. Does not support futures instruments.
Medved Trader	Windows app with a streaming API to various data sources and brokers. See comment below about API beta access.
NinjaTrader	Does not support futures options
Norgate Data	Not a broker; supports futures data for $270/year
Oanda	Forex only; API last updated in 2018
Optimus Futures	Broker with a large number of available platforms including some with API access
Phillip Capital	Broker with a large number of available platforms including some with API access
polygon.io	Expensive but looks slick; does not support futures instruments
Quandl	API looks solid; $49/monthly for personal use, does not allow distributing or sharing data; not a broker
Quantconnect	Does not expose raw data
Quantopian	Does not expose raw data
Quantower	Software that connects to multiple brokers and data feeds; API to their software via C# interface
Saxo Markets	Broker with extensively documented API
Stage 5 Trading	API available through Trading Technologies
Straits Financial	Broker with several platforms available including some with APIs such as CQG, R
Sweet Futures	Broker with a large number of available platforms including some with API access
TastyWorks	There's an unofficial Python API
TenQuant.io	Does not support futures instruments
ThinkorSwim	Does not support futures instruments via the API
Tiingo	Free account tier but does not support futures instruments
TradePro	Broker with a number of platforms available; unclear if any are available with API access
Tradier	Free developer API account for delayed data but does not support futures instruments
TradeStation	Nice looking API docs and supports futures instruments; requires opening an account and a minimum balance of $100k and there’s no trial available
TradeFutures4Less	Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
TradingTechnologies	API looks robust; pricing starts at $700/month
TradingView	Does not expose data API
Tradovate Technologies	API exists, documentation unknown; need to talk to their account team
Wedbush Futures	Broker with several platforms offered, a few of which have API access
WEX	.NET/COM only; pricing not disclosed on website
Xignite	Pricing not disclosed on website but they do support futures instruments
Yahoo Finance API	Available through RapidAPI or via direct access; but it’s discontinued and unreliable
Zaner	Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs

Wow, this list grew longer than I originally thought it would be. If you spot a mistake, please let me know and I’ll correct it.
Edit:
- added Lightspeed API - updated Dashprime to indicate some of the APIs available - added Medved Trader to table - added marketstack to table

[Changelog] - 2/5/2019 - Portfolio Upgrades, WebSocket API Beta, and an Easter Egg

The Cryptowatch team has traveled from across the globe (galaxy?) to come to the ski slopes of an undisclosed location to put together this release for you.

Portfolio Upgrades

We've added a quote currency selector to the portfolio, so you can see your balance in whatever currency you prefer. Our personal favorite, you ask? The IDR, of course. It makes us look the best!

WebSocket API Beta

Our WebSocket API for streaming live prices from all markets on Cryptowat.ch is now live in beta. A few select partners have hammered on it for a few weeks - and you could be next. If you shoot an email to [[email protected]](mailto:[email protected]) with your Cryptowatch username, we can get you set up with access to the beta. Cryptowatch accounts are now free, so go ahead and create one if you haven't yet!

Kraken WebSocket API Launched

Kraken recently launched their streaming WebSocket API, which Cryptowatch now uses to populate Kraken markets. You'll notice much snappier data on all Kraken markets, and we'll soon have deeper order books for Kraken as a result.

New Themes

To match with the new Kraken branding, we've released two new themes to Cryptowatch: Kraken Dark (New) and Kraken Light (New). Check them out in the settings menu on the home page and any chart page.

PGP Keys

Cryptowat.ch has always had a passion and respect for the right of our clients to privacy and security. As we begin to send more emails and communications to clients, you'll occasionally see a "signature.asc" file attached to your emails from us: if you use an email client that supports PGP signatures, like ProtonMail or Thunderbird with Enigmail, you can import our PGP keys to validate the authenticity of our emails to you.

From Pairs to Instruments

While you won't notice any changes to the user interface as a result of this update, it marks a major moment in our ability to support advanced financial products. Currently, Cryptowat.ch (and most services in the crypto space) are built around a "currency exchange" (forex) model of trading one asset for another - a "base" for a "quote". With the changes we are making, we can now support financial products like futures, swaps, options, loans, and more. We cannot promise any of these will be added - but we are working towards a structure that will allow us to do so in the future, should we choose to do so!

QuadrigaCX Disabled

Due to recent tragedies around the QuadrigaCX exchange, we've disabled all of their markets.

Easter Egg

Look out on our Twitter for something interesting coming later this week. It has to do with pairs to instruments, as well as Kraken's acquisition of futures and indices provider Crypto Facilities.

Want to trade across all your exchanges on the fastest market data in crypto? Sign up for a free Cryptowatch account here.

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APIs offered by brokers and data platforms