Broker API changes, week 37 2026
3 dated changes from 7 Sep 2026 to 13 Sep 2026, grouped by broker or platform. Each one links the page it was read on.
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.
A change is filed under the week that holds its own date, as its source gives it. That is not always the week this site read it. The checked date beside each source is the day that page was last opened.
FOREX.com / StoneX Trading (City Index)
Ecosystem
City Index relaunched as StoneX Trading in the UK. The City Index brand retired on 12 Sep 2026 and cityindex.com pages now redirect to stonex.com. StoneX says clients keep the same platforms and accounts; no API change was announced.
StoneX press release: Launch of StoneX Trading marks a new era for City Indexchecked
Affected pages: the FOREX.com / StoneX Trading (City Index) record, everything recorded for it as one file and its own RSS feed.
Interactive Brokers
Breaking
Pacing for GET /iserver/marketdata/history was capped at 10 requests a second or 50 a minute. The changelog does not give the previous limit, so any client paced by an older figure needs rechecking.
IBKR Web API changelogchecked
Deprecation
9 Sep 2026: /hmds/scanner deprecated and removed from the documentation; secType parameter removed from /iserver/secdef/search. Clients passing secType or calling the HMDS scanner should move to /iserver/scanner/run and search without secType.
IBKR Web API changelogchecked
Affected pages: the Interactive Brokers record, everything recorded for it as one file and its own RSS feed.
How to cite this
Broker API changes, week 37 2026. Broker API Hub, https://openbrokerapi.com/changes/weekly/2026-w37, newest check .
Where you rely on a single figure, cite the source and the checked date printed beside it as well.