guilder_client_hyperliquid/

client.rs

use alloy_primitives::Address;
use guilder_abstraction::{self, L2Update, Fill, AssetContext, PredictedFunding, Liquidation, BoxStream, Side, OrderSide, OrderStatus, OrderType, TimeInForce, OrderPlacement, Position, OpenOrder, UserFill, OrderUpdate, FundingPayment, Deposit, Withdrawal};
use futures_util::{stream, SinkExt, StreamExt};
use reqwest::Client;
use rust_decimal::Decimal;
use serde::Deserialize;
use serde_json::Value;
use std::collections::HashMap;
use std::str::FromStr;
use tokio_tungstenite::{connect_async, tungstenite::Message};

const HYPERLIQUID_INFO_URL: &str = "https://api.hyperliquid.xyz/info";
const HYPERLIQUID_EXCHANGE_URL: &str = "https://api.hyperliquid.xyz/exchange";
const HYPERLIQUID_WS_URL: &str = "wss://api.hyperliquid.xyz/ws";

async fn parse_response<T: for<'de> serde::Deserialize<'de>>(resp: reqwest::Response) -> Result<T, String> {
    let text = resp.text().await.map_err(|e| e.to_string())?;
    serde_json::from_str(&text).map_err(|e| format!("{e}: {text}"))
}

pub struct HyperliquidClient {
    client: Client,
    user_address: Option<Address>,
    private_key: Option<String>,
}

impl HyperliquidClient {
    pub fn new() -> Self {
        HyperliquidClient { client: Client::new(), user_address: None, private_key: None }
    }

    pub fn with_auth(user_address: Address, private_key: String) -> Self {
        HyperliquidClient { client: Client::new(), user_address: Some(user_address), private_key: Some(private_key) }
    }

    fn require_user_address(&self) -> Result<String, String> {
        self.user_address
            .map(|a| format!("{:#x}", a))
            .ok_or_else(|| "user address required: use HyperliquidClient::with_auth".to_string())
    }

    fn require_private_key(&self) -> Result<&str, String> {
        self.private_key.as_deref().ok_or_else(|| "private key required: use HyperliquidClient::with_auth".to_string())
    }

    async fn get_asset_index(&self, symbol: &str) -> Result<usize, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "meta"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let meta: MetaResponse = parse_response(resp).await?;
        meta.universe.iter()
            .position(|a| a.name == symbol)
            .ok_or_else(|| format!("symbol {} not found", symbol))
    }

    async fn submit_signed_action(&self, action: Value, vault_address: Option<&str>) -> Result<Value, String> {
        let private_key = self.require_private_key()?;
        let nonce = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .unwrap()
            .as_millis() as u64;

        let (r, s, v) = sign_action(private_key, &action, vault_address, nonce)?;

        let payload = serde_json::json!({
            "action": action,
            "nonce": nonce,
            "signature": {"r": r, "s": s, "v": v},
            "vaultAddress": null
        });

        let resp = self.client
            .post(HYPERLIQUID_EXCHANGE_URL)
            .json(&payload)
            .send()
            .await
            .map_err(|e| e.to_string())?;

        let body: Value = parse_response(resp).await?;
        if body["status"].as_str() == Some("err") {
            return Err(body["response"].as_str().unwrap_or("unknown error").to_string());
        }
        Ok(body)
    }
}

// --- REST deserialization types ---

#[derive(Deserialize)]
struct MetaResponse {
    universe: Vec<AssetInfo>,
}

#[derive(Deserialize)]
struct AssetInfo {
    name: String,
}

type MetaAndAssetCtxsResponse = (MetaResponse, Vec<RestAssetCtx>);

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
#[allow(dead_code)]
struct RestAssetCtx {
    open_interest: String,
    funding: String,
    mark_px: String,
    day_ntl_vlm: String,
    mid_px: Option<String>,
    oracle_px: Option<String>,
    premium: Option<String>,
    prev_day_px: Option<String>,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct ClearinghouseStateResponse {
    margin_summary: MarginSummary,
    asset_positions: Vec<AssetPosition>,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct MarginSummary {
    account_value: String,
}

#[derive(Deserialize)]
struct AssetPosition {
    position: PositionDetail,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct PositionDetail {
    coin: String,
    /// positive = long, negative = short
    szi: String,
    entry_px: Option<String>,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct RestOpenOrder {
    coin: String,
    side: String,
    limit_px: String,
    sz: String,
    oid: i64,
    orig_sz: String,
}

// predictedFundings response: Vec<(coin, Vec<(venue, entry_or_null)>)>
// The API returns null for venues that don't list the coin.
type PredictedFundingsResponse = Vec<(String, Vec<(String, Option<PredictedFundingEntry>)>)>;

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct PredictedFundingEntry {
    funding_rate: String,
    next_funding_time: i64,
}

// --- WebSocket envelope and data shapes ---

#[derive(Deserialize)]
struct WsEnvelope {
    channel: String,
    data: Value,
}

#[derive(Deserialize)]
struct WsBook {
    coin: String,
    levels: Vec<Vec<WsLevel>>,
    time: i64,
}

#[derive(Deserialize)]
struct WsLevel {
    px: String,
    sz: String,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct WsAssetCtx {
    coin: String,
    ctx: WsPerpsCtx,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct WsPerpsCtx {
    open_interest: String,
    funding: String,
    mark_px: String,
    day_ntl_vlm: String,
    mid_px: Option<String>,
    oracle_px: Option<String>,
    premium: Option<String>,
    prev_day_px: Option<String>,
}

#[derive(Deserialize)]
struct WsUserEvent {
    liquidation: Option<WsLiquidation>,
    fills: Option<Vec<WsUserFill>>,
    funding: Option<WsFunding>,
}

#[derive(Deserialize)]
struct WsLiquidation {
    liquidated_user: String,
    liquidated_ntl_pos: String,
    liquidated_account_value: String,
}

#[derive(Deserialize)]
struct WsUserFill {
    coin: String,
    px: String,
    sz: String,
    side: String,
    time: i64,
    oid: i64,
    fee: String,
}

#[derive(Deserialize)]
struct WsFunding {
    time: i64,
    coin: String,
    usdc: String,
}

#[derive(Deserialize)]
struct WsTrade {
    coin: String,
    side: String,
    px: String,
    sz: String,
    time: i64,
    tid: i64,
}

#[derive(Deserialize)]
struct WsOrderUpdate {
    order: WsOrderInfo,
    status: String,
    #[serde(rename = "statusTimestamp")]
    status_timestamp: i64,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct WsOrderInfo {
    coin: String,
    side: String,
    limit_px: String,
    sz: String,
    oid: i64,
    orig_sz: String,
}

// --- WebSocket ledger update shapes (deposits / withdrawals) ---

#[derive(Deserialize)]
struct WsLedgerUpdates {
    updates: Vec<WsLedgerEntry>,
}

#[derive(Deserialize)]
struct WsLedgerEntry {
    time: i64,
    delta: WsLedgerDelta,
}

#[derive(Deserialize)]
struct WsLedgerDelta {
    #[serde(rename = "type")]
    kind: String,
    usdc: Option<String>,
}

// --- Helpers ---

fn parse_decimal(s: &str) -> Option<Decimal> {
    Decimal::from_str(s).ok()
}

fn keccak256(data: &[u8]) -> [u8; 32] {
    use sha3::{Digest, Keccak256};
    Keccak256::digest(data).into()
}

/// EIP-712 domain separator for Hyperliquid mainnet (Arbitrum, chainId=42161).
fn hyperliquid_domain_separator() -> [u8; 32] {
    let type_hash = keccak256(b"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
    let name_hash = keccak256(b"Exchange");
    let version_hash = keccak256(b"1");
    let mut chain_id = [0u8; 32];
    chain_id[28..32].copy_from_slice(&42161u32.to_be_bytes());
    let verifying_contract = [0u8; 32];

    let mut data = [0u8; 160];
    data[..32].copy_from_slice(&type_hash);
    data[32..64].copy_from_slice(&name_hash);
    data[64..96].copy_from_slice(&version_hash);
    data[96..128].copy_from_slice(&chain_id);
    data[128..160].copy_from_slice(&verifying_contract);
    keccak256(&data)
}

/// Signs a Hyperliquid exchange action using EIP-712.
/// Returns (r, s, v) where r and s are "0x"-prefixed hex strings and v is 27 or 28.
fn sign_action(private_key: &str, action: &Value, vault_address: Option<&str>, nonce: u64) -> Result<(String, String, u8), String> {
    use k256::ecdsa::SigningKey;

    // Step 1: msgpack-encode the action, append nonce + vault flag
    let msgpack_bytes = rmp_serde::to_vec(action).map_err(|e| e.to_string())?;
    let mut data = msgpack_bytes;
    data.extend_from_slice(&nonce.to_be_bytes());
    match vault_address {
        None => data.push(0u8),
        Some(addr) => {
            data.push(1u8);
            let addr_bytes = hex::decode(addr.trim_start_matches("0x"))
                .map_err(|e| format!("invalid vault address: {}", e))?;
            data.extend_from_slice(&addr_bytes);
        }
    }
    let connection_id = keccak256(&data);

    // Step 2: hash the Agent struct
    let agent_type_hash = keccak256(b"Agent(string source,bytes32 connectionId)");
    let source_hash = keccak256(b"a"); // "a" = mainnet
    let mut struct_data = [0u8; 96];
    struct_data[..32].copy_from_slice(&agent_type_hash);
    struct_data[32..64].copy_from_slice(&source_hash);
    struct_data[64..96].copy_from_slice(&connection_id);
    let struct_hash = keccak256(&struct_data);

    // Step 3: EIP-712 final hash
    let domain_sep = hyperliquid_domain_separator();
    let mut final_data = Vec::with_capacity(66);
    final_data.extend_from_slice(b"\x19\x01");
    final_data.extend_from_slice(&domain_sep);
    final_data.extend_from_slice(&struct_hash);
    let final_hash = keccak256(&final_data);

    // Step 4: sign with secp256k1
    let key_bytes = hex::decode(private_key.trim_start_matches("0x"))
        .map_err(|e| format!("invalid private key: {}", e))?;
    let signing_key = SigningKey::from_bytes(key_bytes.as_slice().into())
        .map_err(|e| e.to_string())?;
    let (sig, recovery_id) = signing_key.sign_prehash_recoverable(&final_hash)
        .map_err(|e| e.to_string())?;

    let sig_bytes = sig.to_bytes();
    let r = format!("0x{}", hex::encode(&sig_bytes[..32]));
    let s = format!("0x{}", hex::encode(&sig_bytes[32..64]));
    let v = 27u8 + recovery_id.to_byte();

    Ok((r, s, v))
}

// --- Trait implementations ---

#[allow(async_fn_in_trait)]
impl guilder_abstraction::TestServer for HyperliquidClient {
    /// Sends a lightweight allMids request; returns true if the server responds 200 OK.
    async fn ping(&self) -> Result<bool, String> {
        self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "allMids"}))
            .send()
            .await
            .map(|r| r.status().is_success())
            .map_err(|e| e.to_string())
    }

    /// Hyperliquid has no dedicated server-time endpoint; returns local UTC ms.
    async fn get_server_time(&self) -> Result<i64, String> {
        Ok(std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map(|d| d.as_millis() as i64)
            .unwrap_or(0))
    }
}

#[allow(async_fn_in_trait)]
impl guilder_abstraction::GetMarketData for HyperliquidClient {
    /// Returns all perpetual asset names from Hyperliquid's meta endpoint.
    async fn get_symbol(&self) -> Result<Vec<String>, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "meta"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        parse_response::<MetaResponse>(resp).await
            .map(|r| r.universe.into_iter().map(|a| a.name).collect())
    }

    /// Returns the current open interest for `symbol` from metaAndAssetCtxs.
    async fn get_open_interest(&self, symbol: String) -> Result<Decimal, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "metaAndAssetCtxs"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let (meta, ctxs) = parse_response::<Option<MetaAndAssetCtxsResponse>>(resp).await?
            .ok_or_else(|| "metaAndAssetCtxs returned null".to_string())?;
        meta.universe.iter()
            .position(|a| a.name == symbol)
            .and_then(|i| ctxs.get(i))
            .and_then(|ctx| parse_decimal(&ctx.open_interest))
            .ok_or_else(|| format!("symbol {} not found", symbol))
    }

    /// Returns a full AssetContext snapshot for `symbol` from metaAndAssetCtxs.
    async fn get_asset_context(&self, symbol: String) -> Result<AssetContext, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "metaAndAssetCtxs"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let (meta, ctxs) = parse_response::<Option<MetaAndAssetCtxsResponse>>(resp).await?
            .ok_or_else(|| "metaAndAssetCtxs returned null".to_string())?;
        let idx = meta.universe.iter()
            .position(|a| a.name == symbol)
            .ok_or_else(|| format!("symbol {} not found", symbol))?;
        let ctx = ctxs.get(idx).ok_or_else(|| format!("symbol {} not found", symbol))?;
        Ok(AssetContext {
            symbol,
            open_interest: parse_decimal(&ctx.open_interest).ok_or("invalid open_interest")?,
            funding_rate: parse_decimal(&ctx.funding).ok_or("invalid funding")?,
            mark_price: parse_decimal(&ctx.mark_px).ok_or("invalid mark_px")?,
            day_volume: parse_decimal(&ctx.day_ntl_vlm).ok_or("invalid day_ntl_vlm")?,
            mid_price: ctx.mid_px.as_deref().and_then(parse_decimal),
            oracle_price: ctx.oracle_px.as_deref().and_then(parse_decimal),
            premium: ctx.premium.as_deref().and_then(parse_decimal),
            prev_day_price: ctx.prev_day_px.as_deref().and_then(parse_decimal),
        })
    }

    /// Returns a full L2 orderbook snapshot for `symbol` from the l2Book REST endpoint.
    /// Levels are returned as individual `L2Update` items; all share the same `sequence` (timestamp).
    async fn get_l2_orderbook(&self, symbol: String) -> Result<Vec<L2Update>, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "l2Book", "coin": symbol}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let book: WsBook = parse_response(resp).await?;
        let mut levels = Vec::new();
        for level in book.levels.first().into_iter().flatten() {
            if let (Some(price), Some(volume)) = (parse_decimal(&level.px), parse_decimal(&level.sz)) {
                levels.push(L2Update { symbol: book.coin.clone(), price, volume, side: Side::Ask, sequence: book.time });
            }
        }
        for level in book.levels.get(1).into_iter().flatten() {
            if let (Some(price), Some(volume)) = (parse_decimal(&level.px), parse_decimal(&level.sz)) {
                levels.push(L2Update { symbol: book.coin.clone(), price, volume, side: Side::Bid, sequence: book.time });
            }
        }
        Ok(levels)
    }

    /// Returns the mid-price of `symbol` (e.g. "BTC") from allMids.
    async fn get_price(&self, symbol: String) -> Result<Decimal, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "allMids"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        parse_response::<HashMap<String, String>>(resp).await?
            .get(&symbol)
            .and_then(|s| parse_decimal(s))
            .ok_or_else(|| format!("symbol {} not found", symbol))
    }

    /// Returns predicted funding rates for all symbols across all venues.
    /// Null venue entries (unsupported coins) are silently skipped.
    async fn get_predicted_fundings(&self) -> Result<Vec<PredictedFunding>, String> {
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "predictedFundings"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let data: PredictedFundingsResponse = parse_response(resp).await?;
        let mut result = Vec::new();
        for (symbol, venues) in data {
            for (venue, entry) in venues {
                let Some(entry) = entry else { continue };
                if let Some(funding_rate) = parse_decimal(&entry.funding_rate) {
                    result.push(PredictedFunding {
                        symbol: symbol.clone(),
                        venue,
                        funding_rate,
                        next_funding_time_ms: entry.next_funding_time,
                    });
                }
            }
        }
        Ok(result)
    }
}

#[allow(async_fn_in_trait)]
impl guilder_abstraction::ManageOrder for HyperliquidClient {
    /// Places an order on Hyperliquid. Requires `with_auth`. Returns an `OrderPlacement` with
    /// the exchange-assigned order ID. Market orders are submitted as aggressive limit orders (IOC).
    async fn place_order(&self, symbol: String, side: OrderSide, price: Decimal, volume: Decimal, order_type: OrderType, time_in_force: TimeInForce) -> Result<OrderPlacement, String> {
        let asset_idx = self.get_asset_index(&symbol).await?;
        let is_buy = matches!(side, OrderSide::Buy);

        let tif_str = match time_in_force {
            TimeInForce::Gtc => "Gtc",
            TimeInForce::Ioc => "Ioc",
            TimeInForce::Fok => "Fok",
        };
        // Market orders are IOC limit orders at a wide price
        let order_type_val = match order_type {
            OrderType::Limit => serde_json::json!({"limit": {"tif": tif_str}}),
            OrderType::Market => serde_json::json!({"limit": {"tif": "Ioc"}}),
        };

        let action = serde_json::json!({
            "type": "order",
            "orders": [{
                "a": asset_idx,
                "b": is_buy,
                "p": price.to_string(),
                "s": volume.to_string(),
                "r": false,
                "t": order_type_val
            }],
            "grouping": "na"
        });

        let resp = self.submit_signed_action(action, None).await?;
        let oid = resp["response"]["data"]["statuses"][0]["resting"]["oid"]
            .as_i64()
            .or_else(|| resp["response"]["data"]["statuses"][0]["filled"]["oid"].as_i64())
            .ok_or_else(|| format!("unexpected response: {}", resp))?;

        let timestamp_ms = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .unwrap()
            .as_millis() as i64;

        Ok(OrderPlacement { order_id: oid, symbol, side, price, quantity: volume, timestamp_ms })
    }

    /// Modifies price and size of an existing order by its order ID. Requires `with_auth`.
    /// Fetches the order's current coin and side before submitting the modify action.
    async fn change_order_by_cloid(&self, cloid: i64, price: Decimal, volume: Decimal) -> Result<i64, String> {
        let user = self.require_user_address()?;

        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "openOrders", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let orders: Vec<RestOpenOrder> = parse_response(resp).await?;
        let order = orders.iter()
            .find(|o| o.oid == cloid)
            .ok_or_else(|| format!("order {} not found", cloid))?;

        let asset_idx = self.get_asset_index(&order.coin).await?;
        let is_buy = order.side == "B";

        let action = serde_json::json!({
            "type": "batchModify",
            "modifies": [{
                "oid": cloid,
                "order": {
                    "a": asset_idx,
                    "b": is_buy,
                    "p": price.to_string(),
                    "s": volume.to_string(),
                    "r": false,
                    "t": {"limit": {"tif": "Gtc"}}
                }
            }]
        });

        self.submit_signed_action(action, None).await?;
        Ok(cloid)
    }

    /// Cancels a single order by its order ID. Requires `with_auth`.
    /// Fetches open orders to resolve the coin/asset before cancelling.
    async fn cancel_order(&self, cloid: i64) -> Result<i64, String> {
        let user = self.require_user_address()?;

        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "openOrders", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let orders: Vec<RestOpenOrder> = parse_response(resp).await?;
        let order = orders.iter()
            .find(|o| o.oid == cloid)
            .ok_or_else(|| format!("order {} not found", cloid))?;

        let asset_idx = self.get_asset_index(&order.coin).await?;
        let action = serde_json::json!({
            "type": "cancel",
            "cancels": [{"a": asset_idx, "o": cloid}]
        });

        self.submit_signed_action(action, None).await?;
        Ok(cloid)
    }

    /// Cancels all open orders. Requires `with_auth`.
    /// Fetches all open orders and submits a batch cancel in a single signed request.
    async fn cancel_all_order(&self) -> Result<bool, String> {
        let user = self.require_user_address()?;

        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "openOrders", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let orders: Vec<RestOpenOrder> = parse_response(resp).await?;
        if orders.is_empty() {
            return Ok(true);
        }

        let meta_resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "meta"}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let meta: MetaResponse = parse_response(meta_resp).await?;

        let cancels: Vec<Value> = orders.iter()
            .filter_map(|o| {
                let asset_idx = meta.universe.iter().position(|a| a.name == o.coin)?;
                Some(serde_json::json!({"a": asset_idx, "o": o.oid}))
            })
            .collect();

        let action = serde_json::json!({"type": "cancel", "cancels": cancels});
        self.submit_signed_action(action, None).await?;
        Ok(true)
    }
}

#[allow(async_fn_in_trait)]
impl guilder_abstraction::SubscribeMarketData for HyperliquidClient {
    /// Streams L2 orderbook updates for `symbol`. Each message from Hyperliquid is a
    /// full-depth snapshot; every level is emitted as an individual `L2Update` event.
    /// All levels in the same snapshot share the same `sequence` value.
    fn subscribe_l2_update(&self, symbol: String) -> BoxStream<L2Update> {
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "l2Book", "coin": symbol}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "l2Book" { continue; }
                let Ok(book) = serde_json::from_value::<WsBook>(env.data) else { continue; };

                for level in book.levels.first().into_iter().flatten() {
                    if let (Some(price), Some(volume)) = (parse_decimal(&level.px), parse_decimal(&level.sz)) {
                        yield L2Update { symbol: book.coin.clone(), price, volume, side: Side::Ask, sequence: book.time };
                    }
                }
                for level in book.levels.get(1).into_iter().flatten() {
                    if let (Some(price), Some(volume)) = (parse_decimal(&level.px), parse_decimal(&level.sz)) {
                        yield L2Update { symbol: book.coin.clone(), price, volume, side: Side::Bid, sequence: book.time };
                    }
                }
            }
        })
    }

    /// Streams asset context updates for `symbol` via Hyperliquid's `activeAssetCtx` subscription.
    fn subscribe_asset_context(&self, symbol: String) -> BoxStream<AssetContext> {
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "activeAssetCtx", "coin": symbol}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "activeAssetCtx" { continue; }
                let Ok(update) = serde_json::from_value::<WsAssetCtx>(env.data) else { continue; };
                let ctx = &update.ctx;
                if let (Some(open_interest), Some(funding_rate), Some(mark_price), Some(day_volume)) = (
                    parse_decimal(&ctx.open_interest),
                    parse_decimal(&ctx.funding),
                    parse_decimal(&ctx.mark_px),
                    parse_decimal(&ctx.day_ntl_vlm),
                ) {
                    yield AssetContext {
                        symbol: update.coin,
                        open_interest,
                        funding_rate,
                        mark_price,
                        day_volume,
                        mid_price: ctx.mid_px.as_deref().and_then(parse_decimal),
                        oracle_price: ctx.oracle_px.as_deref().and_then(parse_decimal),
                        premium: ctx.premium.as_deref().and_then(parse_decimal),
                        prev_day_price: ctx.prev_day_px.as_deref().and_then(parse_decimal),
                    };
                }
            }
        })
    }

    /// Streams liquidation events for a user address via Hyperliquid's `userEvents` subscription.
    /// Hyperliquid's liquidation event is account-level; `symbol` is empty and `side` is `Sell`.
    fn subscribe_liquidation(&self, user: String) -> BoxStream<Liquidation> {
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "userEvents", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "userEvents" { continue; }
                let Ok(event) = serde_json::from_value::<WsUserEvent>(env.data) else { continue; };
                let Some(liq) = event.liquidation else { continue; };
                if let (Some(notional_position), Some(account_value)) = (
                    parse_decimal(&liq.liquidated_ntl_pos),
                    parse_decimal(&liq.liquidated_account_value),
                ) {
                    yield Liquidation {
                        symbol: String::new(),
                        side: OrderSide::Sell,
                        liquidated_user: liq.liquidated_user,
                        notional_position,
                        account_value,
                    };
                }
            }
        })
    }

    /// Streams public trade fills for `symbol`. "B" (buyer aggressor) → Buy, otherwise → Sell.
    fn subscribe_fill(&self, symbol: String) -> BoxStream<Fill> {
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "trades", "coin": symbol}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "trades" { continue; }
                let Ok(trades) = serde_json::from_value::<Vec<WsTrade>>(env.data) else { continue; };

                for trade in trades {
                    let side = if trade.side == "B" { OrderSide::Buy } else { OrderSide::Sell };
                    if let (Some(price), Some(volume)) = (parse_decimal(&trade.px), parse_decimal(&trade.sz)) {
                        yield Fill { symbol: trade.coin, price, volume, side, timestamp_ms: trade.time, trade_id: trade.tid };
                    }
                }
            }
        })
    }
}

#[allow(async_fn_in_trait)]
impl guilder_abstraction::GetAccountSnapshot for HyperliquidClient {
    /// Returns open positions from `clearinghouseState`. Requires `with_auth`.
    /// Zero-size positions are filtered out. Positive `szi` = long, negative = short.
    async fn get_positions(&self) -> Result<Vec<Position>, String> {
        let user = self.require_user_address()?;
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "clearinghouseState", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let state: ClearinghouseStateResponse = parse_response(resp).await?;

        Ok(state.asset_positions.into_iter()
            .filter_map(|ap| {
                let p = ap.position;
                let size = parse_decimal(&p.szi)?;
                if size.is_zero() { return None; }
                let entry_price = p.entry_px.as_deref().and_then(parse_decimal).unwrap_or_default();
                let side = if size > Decimal::ZERO { OrderSide::Buy } else { OrderSide::Sell };
                Some(Position { symbol: p.coin, side, size: size.abs(), entry_price })
            })
            .collect())
    }

    /// Returns resting orders from Hyperliquid's `openOrders` endpoint. Requires `with_auth`.
    /// `filled_quantity` is derived as `origSz - sz` (original size minus remaining size).
    async fn get_open_orders(&self) -> Result<Vec<OpenOrder>, String> {
        let user = self.require_user_address()?;
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "openOrders", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let orders: Vec<RestOpenOrder> = parse_response(resp).await?;

        Ok(orders.into_iter()
            .filter_map(|o| {
                let price = parse_decimal(&o.limit_px)?;
                let quantity = parse_decimal(&o.orig_sz)?;
                let remaining = parse_decimal(&o.sz)?;
                let filled_quantity = quantity - remaining;
                let side = if o.side == "B" { OrderSide::Buy } else { OrderSide::Sell };
                Some(OpenOrder { order_id: o.oid, symbol: o.coin, side, price, quantity, filled_quantity })
            })
            .collect())
    }

    /// Returns total account value (collateral) from `clearinghouseState`. Requires `with_auth`.
    async fn get_collateral(&self) -> Result<Decimal, String> {
        let user = self.require_user_address()?;
        let resp = self.client
            .post(HYPERLIQUID_INFO_URL)
            .json(&serde_json::json!({"type": "clearinghouseState", "user": user}))
            .send()
            .await
            .map_err(|e| e.to_string())?;
        let state: ClearinghouseStateResponse = parse_response(resp).await?;
        parse_decimal(&state.margin_summary.account_value)
            .ok_or_else(|| "invalid account value".to_string())
    }
}

#[allow(async_fn_in_trait)]
impl guilder_abstraction::SubscribeUserEvents for HyperliquidClient {
    /// Streams the user's own order executions via the `userEvents` WS subscription.
    /// Requires `with_auth` (streams are empty if no user address is set).
    fn subscribe_user_fills(&self) -> BoxStream<UserFill> {
        let Some(addr) = self.user_address else { return Box::pin(stream::empty()); };
        let user = format!("{:#x}", addr);
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "userEvents", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "userEvents" { continue; }
                let Ok(event) = serde_json::from_value::<WsUserEvent>(env.data) else { continue; };
                for fill in event.fills.unwrap_or_default() {
                    let side = if fill.side == "B" { OrderSide::Buy } else { OrderSide::Sell };
                    if let (Some(price), Some(quantity), Some(fee_usd)) = (
                        parse_decimal(&fill.px),
                        parse_decimal(&fill.sz),
                        parse_decimal(&fill.fee),
                    ) {
                        yield UserFill { order_id: fill.oid, symbol: fill.coin, side, price, quantity, fee_usd, timestamp_ms: fill.time };
                    }
                }
            }
        })
    }

    /// Streams order lifecycle events via the `orderUpdates` WS subscription.
    /// Requires `with_auth`.
    fn subscribe_order_updates(&self) -> BoxStream<OrderUpdate> {
        let Some(addr) = self.user_address else { return Box::pin(stream::empty()); };
        let user = format!("{:#x}", addr);
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "orderUpdates", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "orderUpdates" { continue; }
                let Ok(updates) = serde_json::from_value::<Vec<WsOrderUpdate>>(env.data) else { continue; };
                for upd in updates {
                    let status = match upd.status.as_str() {
                        "open" => OrderStatus::Placed,
                        "filled" => OrderStatus::Filled,
                        "canceled" | "cancelled" => OrderStatus::Cancelled,
                        _ => OrderStatus::PartiallyFilled,
                    };
                    let side = if upd.order.side == "B" { OrderSide::Buy } else { OrderSide::Sell };
                    yield OrderUpdate {
                        order_id: upd.order.oid,
                        symbol: upd.order.coin,
                        status,
                        side: Some(side),
                        price: parse_decimal(&upd.order.limit_px),
                        quantity: parse_decimal(&upd.order.orig_sz),
                        remaining_quantity: parse_decimal(&upd.order.sz),
                        timestamp_ms: upd.status_timestamp,
                    };
                }
            }
        })
    }

    /// Streams funding payments applied to positions via the `userEvents` WS subscription.
    /// Requires `with_auth`.
    fn subscribe_funding_payments(&self) -> BoxStream<FundingPayment> {
        let Some(addr) = self.user_address else { return Box::pin(stream::empty()); };
        let user = format!("{:#x}", addr);
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "userEvents", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }

            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "userEvents" { continue; }
                let Ok(event) = serde_json::from_value::<WsUserEvent>(env.data) else { continue; };
                let Some(funding) = event.funding else { continue; };
                if let Some(amount_usd) = parse_decimal(&funding.usdc) {
                    yield FundingPayment { symbol: funding.coin, amount_usd, timestamp_ms: funding.time };
                }
            }
        })
    }

    fn subscribe_deposits(&self) -> BoxStream<Deposit> {
        let Some(addr) = self.user_address else { return Box::pin(stream::empty()); };
        let user = format!("{:#x}", addr);
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "userNonFundingLedgerUpdates", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }
            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "userNonFundingLedgerUpdates" { continue; }
                let Ok(ledger) = serde_json::from_value::<WsLedgerUpdates>(env.data) else { continue; };
                for entry in ledger.updates {
                    if entry.delta.kind == "deposit" {
                        if let Some(amount_usd) = entry.delta.usdc.as_deref().and_then(parse_decimal) {
                            yield Deposit { asset: "USDC".to_string(), amount_usd, timestamp_ms: entry.time };
                        }
                    }
                }
            }
        })
    }

    fn subscribe_withdrawals(&self) -> BoxStream<Withdrawal> {
        let Some(addr) = self.user_address else { return Box::pin(stream::empty()); };
        let user = format!("{:#x}", addr);
        Box::pin(async_stream::stream! {
            let Ok((mut ws, _)) = connect_async(HYPERLIQUID_WS_URL).await else { return; };
            let sub = serde_json::json!({
                "method": "subscribe",
                "subscription": {"type": "userNonFundingLedgerUpdates", "user": user}
            });
            if ws.send(Message::Text(sub.to_string().into())).await.is_err() { return; }
            while let Some(Ok(Message::Text(text))) = ws.next().await {
                let Ok(env) = serde_json::from_str::<WsEnvelope>(&text) else { continue; };
                if env.channel != "userNonFundingLedgerUpdates" { continue; }
                let Ok(ledger) = serde_json::from_value::<WsLedgerUpdates>(env.data) else { continue; };
                for entry in ledger.updates {
                    if entry.delta.kind == "withdraw" {
                        if let Some(amount_usd) = entry.delta.usdc.as_deref().and_then(parse_decimal) {
                            yield Withdrawal { asset: "USDC".to_string(), amount_usd, timestamp_ms: entry.time };
                        }
                    }
                }
            }
        })
    }
}