IB.cancelMktData

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cancelMktData(self, contract: ib_async.contract.Contract) -> bool

Completeness: fully-documented · Canonical ID: ib_async.ib.IB.cancelMktData

Explicit policy override after evidence-backed documentation review.

Related API navigation

• Calls: Client.cancelMktData
• Calls: IB.ticker
• Cancels: IB.reqMktData
• Protocol mapping: EClient.cancelMktData
• Error reference: TWS message codes (applicability is request-dependent).

Sources and provenance

• ib-async-repository-2-1-0 (library-source; retrieved 2026-07-15T03:42:42Z)
• ib-async-repository-2-1-0 (library-source; retrieved 2026-07-15T03:42:42Z)
• ibkr-campus-tws-api (official-current; retrieved 2026-07-14T19:13:54.602937Z)

Unsubscribe from realtime streaming tick data.

Args: contract: The contract of a previously subscribed ticker to unsubscribe.

Returns: Returns True if cancel was successful. Returns False if 'contract' was not found.