Rust NinjaTrader 8 API examples
Memory-safe, async NinjaTrader 8 integration in Rust. reqwest for REST, tokio-tungstenite for WebSocket.
Using Rust against the CrossTrade NinjaTrader API
Rust is the right choice for trading infrastructure that needs predictable latency and zero garbage collection. reqwest handles REST; tokio-tungstenite handles WebSocket. FlattenEverything is a useful primitive: it closes every position and cancels every working order across all accounts in one call.
reqwest = { version = "0.12", features = ["json"] } tokio-tungstenite = "0.27" Watch the request get written
A pseudo-developer types out a real POST FlattenEverything call against your NinjaTrader 8 account. The animation runs on a loop; the static snippet below is yours to copy.
Complete Rust FlattenEverything example
// Cargo.toml:
// reqwest = { version = "0.12", features = ["json"] }
// tokio = { version = "1", features = ["full"] }
use reqwest::header::AUTHORIZATION;
#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
let client = reqwest::Client::new();
let res = client
.post("https://app.crosstrade.io/v1/api/orders/flatten-everything")
.header(AUTHORIZATION, "Bearer YOUR_TOKEN")
.send()
.await?;
println!("{}", res.text().await?);
Ok(())
}Streaming data with tokio-tungstenite = "0.27"
Same flow on a persistent connection: open the socket, send a subscribe message, receive market data or P&L pushes in real time. CrossTrade's WebSocket is at wss://app.crosstrade.io/ws/stream with the same Bearer token in the request header.
Complete Rust WebSocket example
// Cargo.toml:
// tokio = { version = "1", features = ["full"] }
// tokio-tungstenite = "0.27"
// futures-util = "0.3"
use futures_util::{SinkExt, StreamExt};
use tokio_tungstenite::{connect_async, tungstenite::client::IntoClientRequest};
#[tokio::main]
async fn main() {
let mut req = "wss://app.crosstrade.io/ws/stream"
.into_client_request()
.unwrap();
req.headers_mut().insert(
"Authorization",
"Bearer YOUR_TOKEN".parse().unwrap(),
);
let (mut ws, _) = connect_async(req).await.unwrap();
ws.send(r#"{"action":"subscribe","instruments":["ES 12-25"]}"#.into())
.await
.unwrap();
while let Some(Ok(msg)) = ws.next().await {
println!("{msg}");
}
}The full Rust-compatible API surface
Every endpoint documented with request/response schemas, error codes, rate-limit notes, and language-specific code samples.
Same API, different language
Common questions
Is Rust a good language for algorithmic trading?
Yes, especially for trading infrastructure that needs predictable latency, zero garbage-collection pauses, and absolute correctness on order placement (no surprise null pointers, no race conditions). The borrow checker enforces invariants at compile time, which is exactly what you want when the cost of a bug is a wrong-direction trade.
Sync alternative to reqwest?
ureq is the standard sync-only HTTP client — zero tokio dependency, same Bearer-token pattern. For WebSocket sync work, you can pair tungstenite directly (without tokio-tungstenite), but most Rust trading code lives in tokio anyway because the WebSocket is async by nature.
Rust vs Go for trading bots?
Both are excellent — pick based on your team. Rust when you need zero-allocation hot paths or strict memory guarantees (e.g., processing a large stream of market data with predictable latency). Go when you want faster iteration, easier deployment, and built-in concurrency primitives. Rust's compile times are longer; Go's are near-instant.
Async runtime: tokio or async-std?
tokio. It's the dominant ecosystem in Rust async, and both reqwest and tokio-tungstenite are tokio-based. async-std exists but you'd be swimming against the current for new code in 2026.
WebSocket reconnect for production?
Wrap the connection in a loop: connect, subscribe, process messages until disconnect, sleep with exponential backoff (1s, 2s, 4s, cap at 30s), reconnect. tokio-tungstenite's WebSocketStream returns errors on disconnect — match them and decide whether to retry or escalate.
Serde for JSON request bodies?
Yes — derive Serialize on your order struct and reqwest's .json(&body) handles the rest. For responses, derive Deserialize and call res.json::<MyType>().await. The CrossTrade response shapes are stable enough that hand-written structs are practical (no need for OpenAPI codegen).
Cross-compilation for a Windows VPS?
Yes — cargo build --release --target x86_64-pc-windows-gnu produces a .exe runnable on any Windows VPS. Add cross-rs for friction-free cross-compilation from Linux/macOS.
When is Rust overkill for trading?
For one-off scripts, ad-hoc analysis, or daily ops tasks — Python or bash is faster to write. Rust pays off when you're building a long-running production service that handles real money and you want compile-time guarantees that it won't crash at 2 AM.
no-std for embedded trading hardware?
Theoretically yes, but CrossTrade's API needs HTTPS + JSON parsing, which means TLS + alloc. In practice, std with tokio is the right starting point — no-std is for FPGA-adjacent specialty work.
Build your first NinjaTrader 8 trading bot in Rust
One bearer token, one URL, every NinjaTrader endpoint. Ship to Sim101 first.
