TWS error 354: market data is not subscribed

Quick answer

Error 354 points to missing market-data permission for the requested product. Check the exchange, product, username, and API data access. Being able to place an order or see a quote elsewhere does not establish the needed data subscription.

Educational software guidance. Trading involves risk. Read the financial and information disclaimers.

Step by step

1 Copy the product and exchange named in the error.
2 Open the same contract in TWS and check its quote status.
3 Check Market Data Subscriptions in Client Portal for the username used by TWS.
4 Confirm the subscription covers the product and API use before purchasing or changing anything.
5 After a data access change, reconnect as instructed by IBKR and check the exact contract again.

A practical example

Suppose you can trade a future but cannot see its live API quote. The order right and the quote right are separate checks. Write down the exact product and exchange in the error. Then check the feed for the user logged in to TWS. Do not buy a stock feed just because another chart on the screen shows stocks without an error.

Illustrative scenario, not a record of a trade placed during this review.

Screen reference

TWS paper watchlist with instrument rows and quote columns — Use the same instrument row when comparing data. Captured outside the tested execution workflow; this image does not establish real-time entitlement. Captured in TWS paper mode on 3 October 2026. Open the image for full size.

How to confirm the result The needed data request should return the expected data type without the subscription error.

Mistake to avoid

A paid TradingView feed is not automatically an IBKR API data access.

Common questions

Are trading permissions and data permissions the same?

No. Check each separately.

Can delayed data solve every use case?

No. Availability and app support vary, and delayed data is not live data.

TWS error 200: contract not found or ambiguous TWS error 201: read the order rejection reason TWS error 202: why was the order cancelled? TWS delayed versus live data: how to tell

Financial and information disclaimers

Financial disclaimer

These guides explain software. They are for education, not financial, investment, tax, or legal advice. No example is a suggestion to buy or sell a product or use a trading strategy. Trading can lose money, including all funds you put at risk. With margin, futures, short sales, or some options, losses can exceed your starting funds. Automation can fail, send duplicate orders, or act late. Stops do not guarantee a fill or a price. Review your orders and positions, and seek advice from a qualified professional for your own needs. Paper trades, examples, and past results do not predict live results or promise a profit.

Information disclaimer

This is general help based on the sources and check date shown on the page. Screens, settings, fees, data access, and product support can change or differ by app version, account, country, and broker. The content may contain errors or become out of date; accuracy, completeness, and continuous service are not guaranteed. Check current broker and app instructions before acting. Screenshots show where controls are; they do not prove that an order test passed. This guide does not replace broker terms or risk notices. References to IBKR and TradingView identify their products and do not imply their endorsement of this guide.