Interactive Brokers TWS API message code
Interactive Brokers TWS API message code: 517 (unknown contract verify)
The error, as text you can copy
517- Kind
- TWS API message code
- Where you meet it
- In the TWS API, not in the Web API and not in an HTTP status
What does 517 (unknown contract verify) mean on the Interactive Brokers API?
Listed by the vendor as "Unknown contract. Verify the contract details supplied". The words in quotes are from Interactive Brokers' own list. The page marks it as not used in the Python and C# clients.
Risk warning: CFDs and spread bets are complex instruments and come with a high risk of losing money rapidly due to leverage. You can lose money on these products, and each provider publishes its own loss figure under FCA rules. You should consider whether you understand how they work and whether you can afford to take the high risk of losing your money. Automated and API trading can amplify losses through bugs, connectivity failures and runaway orders.
How do I fix 517 (unknown contract verify)?
Check the contract details you sent, as the message says.