Tastytrade Market Data

SOAP2 can read the option quotes of the index options (SPX, NDX, RUT) from your own Tastytrade account instead of Interactive Brokers. The feed is read-only market data: SOAP2 never places, changes or sees orders, positions or balances on Tastytrade. Interactive Brokers stays your broker, your connection and the authority on which contracts exist.

Why use it: Tastytrade does not count against the Interactive Brokers market-data line limit, so the tools that stream many options at once (Vol Surface, vertical skew, GEX/VEX, TRACE) fill faster and are not squeezed by that limit.

Regular edition and above, including Premium, Expert, WhiteLabel and the Free Trial (or Developer mode). On Freeware the settings are greyed out; hover them for the reason. Some tools that benefit from the feed (Vol Surface, GEX/VEX, TRACE, skew) have their own edition requirements. See the Licensing & Editions guide.

Related:

Setting it up

Create your own read-only OAuth application in your Tastytrade account (see Tastytrade's API documentation) and keep its client ID, client secret and refresh token. SOAP2 ships no Tastytrade secret; the credentials are yours alone.
Open General Settings and tick Enable Tastytrade market data.
Press Credentials…, enter the three values and press Test connection. When the test succeeds, press Save.
Set Market data source for options to Tastytrade.

The credentials are stored encrypted on this PC (Windows data protection), never in the settings file and never in the Message Log. Do not add the trade scope to the OAuth application: SOAP2 does not need it.

With the switch off (the default) SOAP2 behaves exactly as it did before: nothing is started, nothing connects.

Choosing the source

There is one source setting for all Options Analysis windows and the Watchlist. Change it:

in General Settings (Market data source for options), or
with the source button on the main toolbar or Alt+W, or
inside an Options Analysis window with Ctrl+Shift+W (Alt+W opens Watchlist Setup there).

The connected indicator reads IB + TT while Tastytrade is serving data. The source is meant to be changed rarely; a switch re-requests the rows and reloads the tools that read their data once per session (for example the Hedging Flow seed).

What Tastytrade serves, and what stays on IB

Served by Tastytrade: option quotes, Greeks and open interest of SPX, NDX and RUT options; the history those tools backfill (30-minute and 1-hour option bars for Rewind, vertical skew and Sticky Skew; one-second prints for the Hedging Flow seed); watchlist quotes that Interactive Brokers leaves without a price (for example NDX without an IB index subscription).
Stays on Interactive Brokers: every other symbol, your account, positions, executions, orders and the list of which contracts exist. A contract Interactive Brokers reports as nonexistent is skipped by the tools even though Tastytrade says nothing about it.
The tools that show where their data came from say so in their status line, for example source: IB, Tastytrade or IB + TT (n of m lines on TT).

SOAP2 still needs an Interactive Brokers connection to start. If Tastytrade fails or drops, the affected rows move back to Interactive Brokers and one line is written to the Message Log.

Expect small differences between the two sources

A result calculated on Interactive Brokers and the same tool later calculated on Tastytrade (or the reverse) can differ slightly. That is normal, not a fault. Causes:

Tastytrade sends roughly a tenth of the updates Interactive Brokers does, with its own Greeks and implied volatilities. The IB IV / B&S IV choice in the Options Analysis window selects between this feed's IV and SOAP2's own back-solve.
The model price of the underlying (MM Price) is an ETF-ratio estimate (SPY for SPX, QQQ for NDX, IWM for RUT) rather than Interactive Brokers' own figure.
Open interest comes from Tastytrade's summary data.
History uses Tastytrade's mark bars against Interactive Brokers' midpoint bars. The median difference is about 0.04 %; on thinly traded strikes it can reach about 3 %, and an evening-session first bar is stamped 15 minutes earlier.
Hedging Flow prints within the same second are merged on Tastytrade, so its blocks are coarser than IB's tick data.
Stored “last known” results carry the source that computed them.

When you compare two readings, compare them on the same source.

When something does not load

You see	Meaning
Credentials test fails	Check the three values, that the refresh token belongs to the same OAuth application, and that the application has the read scope.
“TT silent” in a tool's status	Tastytrade accepted the subscription but sent no data for those contracts (illiquid strike, closed session). It is not reported as a nonexistent contract.
Contracts counted as “do not exist”	Interactive Brokers rejected them (error 200). The tools skip them for about 45 minutes.
An Options Analysis for an index shows no chain	If the index has no Interactive Brokers data, the window waits up to about five minutes for a price (from Tastytrade) before asking for a reference price.

The Message Log lists the source decisions; the log file keeps repeated lines that the on-screen box hides.