http://docs.t4login.com/ 2026-09-10T00:13:00+00:00 http://docs.t4login.com/ http://docs.t4login.com/lib/exe/fetch.php?media=wiki:logo.png text/html 2026-09-08T00:06:37+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:orders&rev=1788825997&do=diff Order Routing ◀ WebSocket API (V2) Prerequisite: subscribe to the account first, and hold a Trading role. Orders into an unsubscribed account are rejected. Prices and Volumes are Decimal Strings — for example “5”, “1.50”, “4200.50”. See Prices & Data Types. Client Order Messages Message Purpose OrderSubmit Place one or more orders into a single account+market. text/html 2026-09-07T22:27:46+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:faq&rev=1788820066&do=diff FAQ ◀ WebSocket API (V2) Which endpoint should I use? Develop and certify on the Simulator (wss:wss-sim.t4login.com/v2); use Live (wss:wss.t4login.com/v2) only after certification. Do I need to re-subscribe after reconnecting? Yes. Sessions are not resumable. After any disconnect, log in again and re-subscribe to your markets and accounts, then reconcile order state from the account snapshot. text/html 2026-09-07T22:27:03+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:certification&rev=1788820023&do=diff Certification ◀ WebSocket API (V2) Build and test against the Simulator (<wss://wss-sim.t4login.com/v2>). Certification is required before you receive Live credentials. Getting started Email T4.APISupport@plus500.com with a clear description of what your application does (markets, order types, expected volume, whether it routes orders or is market-data only). text/html 2026-09-07T22:23:39+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:pricing&rev=1788819819&do=diff Prices, Volumes & Data Types ◀ WebSocket API (V2) Prices and Decimals are Represented as Strings Two wrapper types carry exact numbers as strings: * Price * Decimal message Price { string value = 1; } // e.g. "4200.50" message Decimal { string value = 1; } // e.g. "1.50" text/html 2026-09-07T21:58:58+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:connecting&rev=1788818338&do=diff Connecting and Authenticating ◀ WebSocket API (V2) WebSocket Connection Clients must connect using WebSocket Secure (WSS) over SSL/TLS on port 443. Messages are encoded with Google Protocol Buffers. Environment WebSocket URL Simulator wss://wss-sim.t4login.com/v2 text/html 2026-09-07T21:57:07+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:accounts&rev=1788818227&do=diff Account Feed ◀ WebSocket API (V2) Subscribe to one or more accounts to receive their balances, positions, P&L and order status in real time. Subscribe Send AccountSubscribe to subscribe an account, or all accounts: account_subscribe { subscribe: ACCOUNT_SUBSCRIBE_TYPE_ALL_UPDATES account_id: ["ACCT1", "ACCT2"] // or set subscribe_all_accounts: true upl_mode: UPL_MODE_AVERAGE // optional } text/html 2026-09-07T18:37:16+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:migrating&rev=1788806236&do=diff Migrating from V1 ◀ WebSocket API (V2) V1 (/v1) and V2 (/v2) run side by side, so you can migrate at your own pace. The envelope model is identical — ClientMessage / ServerMessage with a oneof payload. The changes below are what actually differ. Regenerate your code from the text/html 2026-09-07T18:16:00+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:markets&rev=1788804960&do=diff Market Data ◀ WebSocket API (V2) Send a MarketSubscribe message in order to subscribe for market data. You may have multiple active market subscriptions (up to the subscription limit set for your user.) Feed Description Depth of Market (Top of Book) Provides the best bid and best offer. text/html 2026-09-07T17:48:22+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:reference&rev=1788803302&do=diff Message Catalog ◀ WebSocket API (V2) The .proto files define every message and field. This page maps each envelope payload to its message and the proto file that describes it. Message Model All messages travel inside a transport envelope, one Protobuf message per WebSocket text/html 2026-09-07T13:52:13+00:00 chad (chad@undisclosed.example.com) http://docs.t4login.com/doku.php?id=developers:apiv2:download&rev=1788789133&do=diff Download and Support Download The T4 API proto files and tools are available for download from our GitHub repository: * T4 API Tools on GitHub The repository primarily contains the proto files necessary for implementing the T4 API, along with supporting tooling code to help with development and integration.