revolutx

Unofficial Rust SDK for the Revolut X crypto exchange REST API.

NOTE: This project is in active development stage - public API will likely change in next versions

revolutx is a custom implementation of Revolut X API. It is not generated from OpenAPI, but designed from scratch to provide clean, domain-oriented SDK aimed at trading bots and automation. It models trading concepts — symbols, sides, orders, fills, balances, order books, candles, tickers — as Rust types, signs requests automatically with Ed25519, and never represents money or quantities as f64 (all decimals use [rust_decimal]).

Not affiliated with Revolut. Trading automation carries financial risk. You are responsible for your own validation, risk controls, and credential security. This crate handles API access, typing, signing, and error reporting only — it does not provide trading strategy or risk management.

Features

• Domain-oriented, handwritten API — not a generated OpenAPI client.
• Automatic Ed25519 request signing (X-Revx-API-Key / X-Revx-Timestamp / X-Revx-Signature); callers never build these headers.
• Decimal-safe values everywhere via rust_decimal::Decimal (re-exported as revolutx::Decimal).
• Full endpoint coverage: balances, configuration, market data, orders, and trades — verified against the OpenAPI spec by a drift test.
• Safe order builders that prevent obviously invalid requests.
• Typed errors that distinguish configuration, auth, rate-limit, and API errors.
• Async (reqwest + rustls), with optional unauthenticated access to the public market-data endpoints.

Installation

[dependencies]
revolutx = "0.5"
tokio = { version = "1", features = ["macros", "rt-multi-thread"] }

Cargo features

The domain models and error types are always available, independent of features. A FIX-only consumer (e.g. a market maker) can drop the HTTP/TLS dependency tree entirely:

revolutx = { version = "0.5", default-features = false, features = ["fix"] }

Generating an API key

Create an Ed25519 key pair and register the public key in the Revolut X web app. Generate one from the SDK:

let pair = revolutx::generate_key_pair()?;
println!("{}", pair.public_pem);  // register this public key in the web app
// Keep pair.private_pem secret — e.g. store it in the encrypted vault (the CLI).
# Ok::<(), revolutx::Error>(())

…or with openssl:

openssl genpkey -algorithm ed25519 -out private.pem
openssl pkey -in private.pem -pubout -out public.pem

Keep the private key secret. The SDK loads it via [ClientBuilder::private_key_pem], or — encrypted at rest — from the vault managed by revolutx-cli.

Quick start

use revolutx::{Environment, RevolutXClient};

#[tokio::main]
async fn main() -> revolutx::Result<()> {
    let client = RevolutXClient::builder()
        .api_key("your-api-key")
        .private_key_pem(std::fs::read_to_string("private.pem").unwrap())
        .environment(Environment::Production)
        .build()?;

    // Account
    let balances = client.balances().get_all().await?;
    for b in &balances {
        println!("{}: {} available", b.currency, b.available);
    }

    // Market data
    let book = client.market_data().order_book("BTC-USD").await?;
    println!("{} bids / {} asks", book.bids.len(), book.asks.len());

    Ok(())
}

Public market data (no credentials)

# async fn run() -> revolutx::Result<()> {
let client = revolutx::RevolutXClient::builder().build()?;
let book = client.market_data().public_order_book("BTC-USD").await?;
let last = client.market_data().last_trades().await?;
println!("{} bid levels, {} recent trades", book.bids.len(), last.trades.len());
# Ok(())
# }

Placing orders

Order builders validate the request (positive price/size, non-empty symbol, exactly one configuration and size) and sign it for you:

use revolutx::{Decimal, RevolutXClient};
use std::str::FromStr;

# async fn run(client: RevolutXClient) -> revolutx::Result<()> {
// Post-only limit buy of 0.1 BTC at 50,000.50 quote.
let ack = client
    .orders()
    .limit_buy("BTC-USD", Decimal::from_str("0.1").unwrap(), Decimal::from_str("50000.50").unwrap())
    .post_only()
    .send()
    .await?;
println!("order {} -> {:?}", ack.venue_order_id, ack.state);

// Market sell using a quote amount.
let ack = client
    .orders()
    .market_sell_quote("BTC-USD", Decimal::from_str("100").unwrap())
    .send()
    .await?;

// Manage orders.
let active = client.orders().active(&Default::default()).await?;
client.orders().cancel_all().await?;
# let _ = (ack, active);
# Ok(())
# }

Error handling and rate limits

# async fn run(client: revolutx::RevolutXClient) {
match client.balances().get_all().await {
    Ok(balances) => println!("{} balances", balances.len()),
    Err(e) if e.is_rate_limited() => {
        if let Some(delay) = e.retry_after() {
            eprintln!("rate limited; retry after {delay:?}");
        }
    }
    Err(e) if e.is_auth_error() => eprintln!("auth problem: {e}"),
    Err(e) => eprintln!("request failed: {e}"),
}
# }

Endpoint groups

See docs/openapi-inventory.md for the full operation/schema mapping.

Examples

Runnable examples live in examples/:

cargo run --example market_data -- BTC-USD          # public, no credentials
cargo run --example generate_keypair                # make an Ed25519 key to register
REVOLUTX_API_KEY=... cargo run --example get_balances

examples/place_limit_order.rs performs real trading and is guarded by REVOLUTX_CONFIRM_PLACE_ORDER=yes.

Related crates

• revolutx-cli — a command-line interface over this SDK: an encrypted credential vault (rcypher SecretStore; password and/or FIDO2), every endpoint as a command, and a signing agent that holds the keystore so headless clients can delegate signing (cargo install revolutx-cli).
• revolutx-mcp — a Model Context Protocol (MCP) server that exposes this SDK to LLM clients such as Claude Desktop, talking to the agent over a one-time-token-authenticated socket (cargo install revolutx-mcp).

Testing

The default test suite is fast, deterministic, and offline:

cargo test

Opt-in, read-only live smoke tests require credentials and are ignored by default:

export REVOLUTX_API_KEY=... REVOLUTX_PRIVATE_KEY_PEM="$(cat private.pem)"
cargo test --test live_smoke -- --ignored --nocapture

MSRV

Rust 1.88 (edition 2024). The keystore and agent features pull in rcypher, which requires 1.87; the workspace's own floor is 1.88 (the time dependency).

License

Licensed under the Apache License 2.0.