IB / TWS Bridge
Interactive Brokers™ offers access to most major exchanges, a huge number of supported assets, and relatively low trading costs. The IB bridge allows direct trading with IB, either
with IB's platform, the Trader Workstation (TWS), or with the IB Gateway.
The TWS is preferable for testing a script, the Gateway for long-term automated
trading. The TWS, a bloated java program, normally stops every 24 hours and interrupts the connection.
The Gateway can also occasionally disconnect, but less often than the TWS. When downloading the TWS or Gateway from the IB website,
better get the release
(stable) version, not the beta (unstable) version.
For trading with the TWS, open File/Global Configuration/API/Settings (see screenshot below) and select Enable ActiveX and Socket Clients. Make sure that the socket port is set to 7496. Deselect Read-Only API when you want to send orders.
Make sure that Allow connections from localhost only
is checked. Enter an individual number from 101..108 in Zorro's User field for connecting to the TWS via socket port 7496. The Password field can be left empty.
For trading with Gateway, select IB API (not FIX CTCI). Open Configuration/API/Settings and make sure that the socket port is set to 4002. Enter an individual number from 1..8 in Zorro's User field for connecting to the Gateway via socket port 4002. The Password field can be left empty.
Up to 8 Zorros can connect to the same Gateway or to the same TWS. But only a single TWS or a single Gateway per
user is supported by IB. The connection will break down when a second Gateway or TWS instance
with the same user is opened, even on a different PC.
Zorro login fields for IB:
||1 .. 8 for the Gateway,
101 .. 108 for the TWS
Asset list example: AssetsIB.csv
Accounts.csv example entries:
Trading with IB. Rebalancing portfolios
The IB plugin included with the free Zorro version supports paper trading accounts that begin with the letter "D". A plugin for
real accounts is included in Zorro S. For opening an account with IB, the normal choice is a
RegT Margin account. If you own Zorro S
and trade high volumes, consider a Portfolio Margin account with its lower margin costs.
At the time of this writing, IB paper trading accounts were only available after opening a real account.
Due to the high margin and lot size requirements, the Forex/CFD trading
Z systems are not really suited for IB.
They would require a large Capital
setup for not skipping too many trades, and even then achieve less annual return due to the low leverage. The main advantage of IB is
support of many exchanges, so that a large range of financial assets can be traded. This allows many new trade systems that exploit specific inefficiencies, f.i. volatility, or seasonal effects of particular stocks or treasuries.
Unadjusted historical price data for backtests can be downloaded from IB,
with limits to the data resolution and maximum number of years. In second
resolution only a few days of data are normally available. Unadjusted and
adjusted EOD data is also available from many other Internet sources, f.i. from Yahoo,
Stooq, or Quandl by using the Download script or the assetHistory or dataDownload functions.
Assets symbols can be defined in a way that live data
is loaded from IB and historical EOD data from another source.
For rebalancing portfolios, the script can
either adjust positions directly through enter/exit
commands, or generate a CSV file containing the desired asset percentages. This
file can then be manually imported in the TWS window
Portfolio Tools / Rebalance Portfolio and will produce orders for
adjusting the positions. The required CSV format changes from time to time, so
export first an example file from the TWS and use it as template for the file
generated by your script. An example file that rebalances a Z9 portfolio:
For trading an asset, some prerequisites must be fulfilled:
- Subscribe market data on the IB website.
Otherwise you'll get a "market data
is not subscribed" error message at session start. Forex market data is free, most other data requires a monthly fee. For subscribing market data, enter your IB account management page, and select
User Settings / Market Data. For the usual US stocks and ETFs, subscribe the "U.S. Securities Snapshot and Futures Value Bundle" and the
"US Equity and Options Add-On Streaming Bundle".
If you're a private trader, make sure that your account has
status, otherwise your subscription fees will multiply. For finding out which subscription you need for which asset, enter the asset
in the Favorites window of the TWS, then right click on it. If the asset is
not yet subscribed, select Subscribe Market Data and
you'll be led to a web page where you can subscribe it. For trading on a
account, activate Share Market Subscription
in the account settings for sharing your subscriptions with the paper trading account.
- Obtain trading permission from IB for all asset types you want to trade, under Trade Configuration / Permissions (see image below). You must fill in a form about your trading experience and your financial situation. It takes about 24 hours to get approval for trading all asset types. Penny stocks require a special approval.
- Remove trading restrictions. Open File / Global Configuration / API / Precautions / Bypass Order Precautions for API Orders and enable Suppress market cap check. Otherwise orders of more than 5 contracts will not be executed and you'll get an "over limit" error message. Alternatively, you can increase order precaution limits individually per asset type.
- Make sure that all traded assets are listed in the TWS Monitor and their prices are visible before connecting to IB (even when using the Gateway). A system can not be started when its assets prices or history are currently not available due to
missing market subscriptions or other reasons.
- Check if local regulations permit trading
the assets on your account. For instance, US citzens can be prohibited from
trading CFDs or limited in the number of trades per week. European citizens
are normally not allowed to trade US ETFs.
Not all assets can be traded all the time. Index (IND)
assets are read only, but you can trade indices with ETFs, Futures, or CFDs. Some assets, such as
specific CFDs, are not available to US citizens, and require an UK or other account outside the US.
European traders are not allowed, thanks to EU regulations, to trade US ETFs. The default minimum sizes for currency pairs are in the 20,000 contracts range, but entering a lower minimum size in the asset list is also possible. Orders are then marked as 'odd lot' and cause higher transaction costs. Some stocks (STK) and some other assets
are not shortable, either permanently or dependent on market liquidity. Short trades for closing a long position are normally
For setting up the IB asset list and for simulating IB trading in the
backtest, margin requirements can be found on
maintenance or end-of-day margin is often higher than the initial margin.
Any asset you want to trade must be represented by a line in the asset list.
The asset symbols (Symbol column) are converted to IB
contracts in the following way:
- It a symbol has a '/' slash at the 4th position (f.i. EUR/USD),
it is assumed a forex pair. Is is split in currency (first three characters) and counter currency (last three characters), gets the asset type CASH and is routed to the IDEALPRO exchange.
Forex pairs are displayed with a dot (f.i. EUR.USD) in the TWS, and the purchased amount is listed separately per currency in the TWS account window.
- If the symbol contains no slash and no hyphen (f.i. AMZN), is it assumed a
US stock or ETF. SMART routing with primary exchange ISLAND
is used. These parameters work for most US stocks and ETFs, except
when the asset is traded at several different exchanges or when the same symbol
is also used for other assets types such as futures or CFDs. Then the full symbol name
with exchange and currency must be given, see below.
- Symbols containing '-' hyphen characters are split in separate strings as
described under Symbols. String 1 is the
ticker name, string 2 the
asset type (STK, OPT, FUT, FUTX, IND, FOP, WAR, CASH, CFD, STKCFD, FUND, EFP, BAG, BOND, CMDTY), string 3 the
exchange and string 4 the
counter currency. If the currency is omitted, USD is assumed. If the exchange is omitted,
SMART is used with
ISLAND as primary exchange. Examples: AAPL-STK-NYSE-USD, XAGUSD-CMDTY,
If an asset is traded on several exchanges in different
countries or time zones, you can receive a message like "Contract
description is ambiguous" at the time when market hours overlap. In
this case you must the exchange code and/or the currency in the asset list symbol, like "*-STK-NYSE-USD".
- The following exchange codes are supported: SMART,
XETRA. If a primary exchange is required, add it with a slash (f.i.
SMART/LSE). US stocks normally require ISLAND
as primary exchange, European stocks normally require an empty string (SMART/)
that allows to select the primary exchange automatically. Some info about exchange
codes can occasionally be found in the IB documentation; otherwise
experimenting is required for finding the correct combination of exchange
and primary exchange. Symbols that work for retrieving prices and
positions do not always work for placing orders, and symbols for the
underlying do not always work for options (see below).
- Options have symbols in the format Ticker-OPT-Expiry-Strike-Put/Call-Exchange, f.i.
AAPL-OPT-20191218-1350.0-C-GLOBEX. Futures have symbol names in the format
Ticker-FUT/FUTX-Expiry-TradingClass-Exchange(-Currency), f.i. SPY-FUT-20191218-SPY1C-GLOBEX.
Alternatively to the expiry date, a contract month symbol can be used, f.i.
ESH9 for the ES 2019 March contract. If the trading
class of a future is not required, f.i. for ES, use the
ticker name instead: ES-FUT-20200319-ES-GLOBEX.
Options on futures have symbol names in the format
ZS-FOP-20191218-900.0-C-OSD-ECBOT. If the currency is
ambiguous or is different to USD, append it at the end, like
DAX-FUTX-20171217-FDAX-DTB-EUR. The symbols are automatically generated
when calling the contract function.
- Two special symbol types are supported by the IB bridge. The type STKCFD trades as a
CFD, but gets the price quotes and historical prices of the underlying stock. This is useful for stock CFDs (f.i. AAPL-STKCFD) which can be traded, but get no price quotes from IB. The type FUTX can be used for downloading historical data of
expired futures contracts.
A example file AssetsIB.csv with currencies, CFDs, and stocks is included; we do however not guarantee the accuracy and correctness, so use it at your own risk.
Additional data and commands
The IB bridge supports the following additional data streams:
- marketVal: Not supported in historical data,
bid-ask spread in live data.
- marketVol: Trade volume per minute in historical
M1 data, per day in historical D1 data; accumulated volume since market open in live data. Only for exchange-traded assets, not for currencies.
Live volume is unfiltered; historical volume is filtered by delayed
transactions, busted trades, or unreportable trades.
Multiple IB accounts are supported. The account can be set
up in the account list.
The IB bridge supports the brokerCommand function with the following commands
(extra commands can be implemented
on user request):
- GET_POSITION (see remarks)
(1 = ask/bid; 2 = last trade; 8
(3 = quote size; 4 = trade volume;
5 = ask size; 6 = bid size)
- SET_ORDERTYPE (2
= GTC order, 8 = stop order, 2+8 =
- SET_ORDERTEXT ("ABC/DEF"
for order type ABC and Time-In-Force DEF)
- GET_TRADES (Zorro 2.33 or above)
- GET_BOOK (market depth must be
subscribed and the exchange must be coded in the asset symbol)
Known IB API issues
- Restricted history. Historical data is only available for
subscribed assets. Further limitations can be found under https://interactivebrokers.github.io/tws-api/historical_limitations.html. The assetHistory function can be used for downloading M1
and EOD data from IB. Downloading data in higher resolutio than 1 minute is
possible, but only for a few hours due to IB's history limits. For long lookback periods or for special asset types historical prices
might be only available in reduced resolution, such as 1 hour or 1 day.
Historical options data is not available. For
downloading index data, set the price type to "last trade". When
downloading large amounts or high resolution data, reduce the
request rate for avoiding API disconnections.
- Trades and orders. The IB API is NFA compliant and does not control individual trades. All trades
can therefore only controlled by Zorro. The account portfolio only reflects the net sum of all open positions by all connected Zorros. The NFA flag
or an according NFA account list entry must be set for IB accounts.
Trades are IOC by default; partial fills are possible. Manually closing positions is not reported
back by the API and thus won't automatically close the corresponding trades in the Zorro session. The
GET_POSITION command and the LotsPool variable can be used for comparing open positions between Zorro and IB. Use cancelTrade for removing manually closed positions.
Use enterTrade for converting an open IB position to
a Zorro-controlled trade.
Limit orders are supported with OrderLimit,
and GTC trade mode can be switched on with
TradeMode. Set TR_ENTRYSTOP for
adding a stop order to a trade; this is for special purposes only since the
stop order is not managed by Zorro either, When orders are slow to execute - especially
option combos - increase the wait time (SET_WAIT
comand) or use TR_GTC. Since IB does not store trades, the only way for
Zorro to find out if or when a GTC trade was opened is the
for sending special order types when the text contains a slash '/'.
The symbol before the slash, if any, is the order type; the symbol after the
slash, if any, is the time-in-force parameter (f.i. "MOC/"
for a market-on-close order or "MKT/OPG" for a market-on-open
order). All order types can, and some must, be combined with GTC mode and OrderLimit. Auxiliary parameters aside
from the order limit are not yet supported. A list of order types can be found
http://interactivebrokers.github.io/tws-api/basic_orders.html. Not all
order types work with all asset types.
Orders on advisor accounts are not (yet) supported by the IB plugin. Contact
us if you require an implementation.
- Market hours. Outside market hours - normally 9:30 .. 15:00 ET for US-traded assets - price quotes are not
always available, so you might get a "unavailable at this time"
warning. Therefore it is recommended to begin a session when the market is
open. If PRELOAD is set and the API does not respond to a price request, Zorro will attempt to retrieve the last known historical price. This is indicated by a "frozen price" message. If an order can not be immediately executed, it is cancelled, so there won't be any pending orders except for Zorro-controlled entry conditions. Sometimes orders can be executed outside market hours, but with higher transaction costs. Therefore trading outside market hours should generally be avoided.
- Asset parameters. Except for price and bid/ask spread,
no asset parameters are available through the IB API. Leverage, commission, pip cost, and lot size of traded assets must be
set up manually, either by script or in the asset list. Typical
maintenance leverage on a RegT account is 33 for most Forex pairs, 2 for stocks and ETFs, and 20 for CFDs. The parameters need not be 100% accurate, but should not be too far off in the interest of realistic backtests. You can find examples (with no guarantee of accuracy and correctness) of major currencies, CFDs, and stocks in the included file AssetsIB.csv.
- Price data. The price type can be selected with the
SET_PRICETYPE command between ask/bid
and last traded price and a special 'fast' price mode. By default the price
functions return the ask/bid price; if it is not available, the last price is
returned. Some assets, such as indices, have no ask/bid prioces. Otherwise it is advisable to enforce the last traded price when the market
is closed, because ask/bid can then be very outdated.
The first price request after session start, and requesting the price of
an option or future contract, can be very slow
(up to 10 seconds or
more). The SET_PRICETYPE,8 command applies a
software trick that aborts the price request early, and can load contract
prices remarkably faster, especially for options or in the initial
run with many assets. Set the price type back when fast requests are
not needed, since the type of price returned is undefined in fast mode.
Some index prices, such as VIX-IND-CBOE-USD and
VIX3M-IND-CBOE-USD, were reported to be only available after
VIX / VIX3M was entered in the TWS
- Positions. IB does not store trades, only net positions
are available via API. By default, positions are only available for exchange
traded products, not for forex pairs. Enable File /
Global Configuration / API / Include Virtual FX positions for
getting forex positions.
- Account status. The API provides a lots of account parameters, but none
of them is 100% equivalent to balance and equity. Therefore proxies are used: Equity is set to the
Net Liquidation Value, Balance
is set to Available Funds, and MarginVal is set to the Current Maintenance Margin. Non-US accounts sometimes
return account parameters in wrong currency immediately after connection. This is corrected after about a minute.
- Limited result accuracy. Profits displayed in the TWS by closing a trade can be very different from the real trade profit, since the API returns only the profit based on the average of all open positions. Total profit will also differ slighty because transactions costs and leverage can not be retrieved through the API, therefore approximate values are used on the Zorro side.
- Connection issues. The IB API will produce warnings during operation.
Most are harmless. The ominous mesages in the Gateway log "Invalid incoming request type 0" are
'heatbeat requests' of the IB API library and can be safely ignored.
The Gateway tends to log out and in by itself,
regularly once per day and sometimes also in irregular intervals, displaying messages like
"Connectivity between IB and Trader Workstation has been lost".
The connection to IB price servers is sometimes briefly interrupted with the message
"Data Farm connection lost". Re-login attempts by
the Gateway or the TWS were reported to temporarily block socket connections
on the PC, which can affect other parallel running sessions.
Zorro will automatically reconnect all lost connections and continue the sessions,
so user intervention is normally not required. You
can reduce connection issues by setting TickTime to
a higher value or by reducing the request rate.
- Single session only. You can not connect
twice with the same user name to the TWS, the Gateway,
or the IB website - not even for only checking your account.
You'll get a message like
"No market data during competing live session". When you log in with the TWS, the Gateway connection
might break down, or vice versa. After terminating your TWS session you must therefore manually re-login from the Gateway. Zorro will automatically resume the session after an interruption, but while not connected it can not handle entries, stops, or profit targets. For working around this problem, you can register a second user for your IB account, and open the TWS with this second user name.
This requires that you pay separate market data subscriptions for the second
user name. The workaround does not work for IB paper accounts, which are single-user only.
- No hibernation. The PC must not be reset, restarted, switched off, hibernate, or go in suspend mode while connected to the IB
TWS API. Otherwise the API may crash and require a Zorro restart.
Typical IB API error messages
- Requested market data is not subscribed: You forgot to
subscribe your assets. See above. Using delayed market data is not possible
with the IB API.
- Historical market data pacing violation: You exceed the
IB history linmits. Download less data in lower resolution.
- No security definition has been found: You entered a
wrong symbol in the asset list. See above how to
put together correct IB symbols. If you
don't know the symbol, exchange, or currency of a particular asset, enter it under
Favorites in the TWS and hit [Return].
You'll then normally get a list of proposals. This error message is
sometimes also issued when the symbol is correct, but a trade cannot be
entered due to order size limits or other reasons.
- Contract description ... is ambiguous: You
entered an incomplete symbol. If the same asset is traded on several
exchanges or in several countries, you need to include the exchange and/or
the currency as described above. If futures or options are available with
different multipliers, use the SET_MULTIPLIER
command before downloading prices.
- Error validating request - cause ...: A
command could not be executed for a reason listed under 'cause'.
- Order rejected - reason ...: A trade could not be opened
for the given reason.
- Price does not conform to the minimum price variation for this
contract: The given limit or stop price has too high precision. Use
the roundto function to round it to 1 pip or to the
smallest allowed increment.
- No market data due to competing live session: You
opened another TWS or Gateway session, possibly on a different device. You
must be looged out on all devices for using the IB API:
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