Lightcone SDK

Rust SDK for the Lightcone impact market protocol on Solana.

Table of Contents

• Installation
• Feature Flags
• Quick Start
• Start Trading
  • Step 1: Find a Market
  • Step 2: Deposit Collateral
  • Step 3: Place an Order
  • Step 4: Monitor
  • Step 5: Cancel an Order
  • Step 6: Exit a Position
• Examples
• Authentication
• Error Handling
• Retry Strategy

Installation

Add to your Cargo.toml:

[dependencies]
lightcone = { version = "0.3.21", features = ["native"] }

For browser/WASM targets:

[dependencies]
lightcone = { version = "0.3.21", features = ["wasm"] }

Feature Flags

Quick Start

use lightcone::prelude::*;
use lightcone::auth::native::sign_login_message;
use solana_keypair::Keypair;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = LightconeClient::builder()
        .rpc_url("https://api.devnet.solana.com")
        .deposit_source(DepositSource::Market)
        .build()?;
    let keypair = Keypair::new();

    // 1. Authenticate
    let nonce = client.auth().get_nonce().await?;
    let signed = sign_login_message(&keypair, &nonce);
    let user = client.auth().login_with_message(
        &signed.message,
        &signed.signature_bs58,
        &signed.pubkey_bytes,
        None,
    ).await?;

    // 2. Find a market
    let market = client.markets().get_by_slug("some-market").await?;
    let orderbook = &market.orderbook_pairs[0];

    // 3. Get orderbook decimals for price scaling
    let decimals = client.orderbooks()
        .decimals(orderbook.orderbook_id.as_str()).await?;

    // 4. Build, sign, and submit a limit order
    let nonce = client.rpc().get_user_nonce(&keypair.pubkey()).await?;
    let request = client.orders().limit_order().await
        .maker(keypair.pubkey())
        .market(market.pubkey.to_pubkey()?)
        .base_mint(orderbook.base.pubkey().to_pubkey()?)
        .quote_mint(orderbook.quote.pubkey().to_pubkey()?)
        .bid()
        .price("0.55")
        .size("100")
        .nonce(nonce)
        .apply_scaling(&decimals)?
        .sign(&keypair, orderbook.orderbook_id.as_str())?;

    let response = client.orders().submit(&request).await?;
    println!("Order submitted: {:?}", response);

    // 5. Stream real-time updates
    let mut ws = client.ws_native();
    ws.connect().await?;
    ws.subscribe(SubscribeParams::Books {
        orderbook_ids: vec![orderbook.orderbook_id.clone()],
    })?;

    Ok(())
}

Start Trading

use lightcone::prelude::*;
use solana_keypair::read_keypair_file;
use solana_signer::Signer;

let client = LightconeClient::builder()
    .rpc_url("https://api.devnet.solana.com")
    .deposit_source(DepositSource::Market)
    .build()?;
let keypair = read_keypair_file("~/.config/solana/id.json")?;

Step 1: Find a Market

let market = client.markets().get_by_slug("some-market").await?;
let orderbook = market
    .orderbook_pairs
    .iter()
    .find(|pair| pair.active)
    .or_else(|| market.orderbook_pairs.first())
    .expect("market has no orderbooks");

Step 2: Deposit Collateral

let deposit_mint = market.deposit_assets[0].pubkey().to_pubkey()?;
let deposit_ix = client.positions().deposit().await
    .user(keypair.pubkey())
    .mint(deposit_mint)
    .amount(1_000_000)
    .market(&market)
    .build_ix()
    .await?;

Step 3: Place an Order

let decimals = client.orderbooks().decimals(orderbook.orderbook_id.as_str()).await?;
let scales = OrderbookDecimals {
    orderbook_id: decimals.orderbook_id,
    base_decimals: decimals.base_decimals,
    quote_decimals: decimals.quote_decimals,
    price_decimals: decimals.price_decimals,
    tick_size: orderbook.tick_size.max(0) as u64,
};
let request = client.orders().limit_order().await
    .maker(keypair.pubkey())
    .market(market.pubkey.to_pubkey()?)
    .base_mint(orderbook.base.pubkey().to_pubkey()?)
    .quote_mint(orderbook.quote.pubkey().to_pubkey()?)
    .bid()
    .price("0.55")
    .size("1")
    .nonce(client.rpc().get_user_nonce(&keypair.pubkey()).await?)
    .apply_scaling(&scales)?
    .sign(&keypair, orderbook.orderbook_id.as_str())?;
let order = client.orders().submit(&request).await?;

Step 4: Monitor

let open = client
    .orders()
    .get_user_orders(&keypair.pubkey().to_string(), Some(50), None)
    .await?;
let mut ws = client.ws_native();
ws.connect().await?;
ws.subscribe(SubscribeParams::Books {
    orderbook_ids: vec![orderbook.orderbook_id.clone()],
})?;
ws.subscribe(SubscribeParams::User {
    wallet_address: keypair.pubkey().into(),
})?;

Step 5: Cancel an Order

let cancel = CancelBody::signed(order.order_hash.clone(), keypair.pubkey().into(), &keypair);
client.orders().cancel(&cancel).await?;

Step 6: Exit a Position

// sign_and_submit builds the tx, signs it using the client's signing strategy, and submits
let tx_hash = client.markets().merge_complete_set()
    .user(keypair.pubkey())
    .market(market.pubkey.to_pubkey()?)
    .mint(deposit_mint)
    .amount(1_000_000)
    .num_outcomes(num_outcomes)
    .sign_and_submit()
    .await?;

Authentication

Authentication is only required for user-specific endpoints. Authentication is session-based using ED25519 signed messages. The flow is: request a nonce, sign it with your wallet, and exchange it for a session token.

Examples

All examples are runnable with cargo run --example <name> --features native. Set environment variables in a .env file - see .env.example for the template.

Setup & Authentication

Market Discovery & Data

Placing Orders

Cancelling Orders

On-Chain Operations

WebSocket Streaming

Error Handling

All SDK operations return Result<T, SdkError>:

Notable HttpError variants:

Retry Strategy

• GET requests: RetryPolicy::Idempotent - retries on transport failures and 502/503/504, backs off on 429 with exponential backoff + jitter.
• POST requests (order submit, cancel, auth): RetryPolicy::None - no automatic retry. Non-idempotent actions are never retried to prevent duplicate side effects.
• Customizable per-call with RetryPolicy::Custom(RetryConfig { .. }).