Swap API

import { SwapServiceClient, EstimateSwapRequest } from './proto/SwapServiceClientPb'

const client = new SwapServiceClient('http://localhost:5003')

const request = new EstimateSwapRequest()
request.setSendingCurrency({
  network: { protocol: 1, id: '0a03cf40' },
  assetId: '0x0000000000000000000000000000000000000000000000000000000000000000'
})
request.setReceivingCurrency({
  network: { protocol: 2, id: '11155111' },
  assetId: '0x0000000000000000000000000000000000000000'
})
request.setAmount({
  from: { amount: { value: '1000000' } } // 0.01 BTC
})

const response = await client.estimateSwap(request, {})
const match = response.getOrderMatch()

if (match) {
  console.log('Sending:', match.getSendingAmount())
  console.log('Receiving:', match.getReceivingAmount())
  console.log('Price:', match.getPrice())
} else {
  console.log('No liquidity available')
}

import (
    "context"
    "log"
    pb "your-package/proto"
)

client := pb.NewSwapServiceClient(conn)

req := &pb.EstimateSwapRequest{
    SendingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_BITCOIN,
            Id:       "0a03cf40",
        },
        AssetId: "0x0000000000000000000000000000000000000000000000000000000000000000",
    },
    ReceivingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_EVM,
            Id:       "11155111",
        },
        AssetId: "0x0000000000000000000000000000000000000000",
    },
    Amount: &pb.SwapAmount{
        Amount: &pb.SwapAmount_From_{
            From: &pb.SwapAmount_From{Amount: &pb.DecimalString{Value: "0.01"}},
        },
    },
}

resp, err := client.EstimateSwap(context.Background(), req)
if err != nil {
    log.Fatalf("Error: %v", err)
}

if match := resp.GetOrderMatch(); match != nil {
    log.Printf("Sending: %s", match.GetSendingAmount())
    log.Printf("Receiving: %s", match.GetReceivingAmount())
    log.Printf("Price: %s", match.GetPrice())
} else {
    log.Println("No liquidity available")
}

use tonic::Request;
use your_package::swap_service_client::SwapServiceClient;
use your_package::{EstimateSwapRequest, OrderbookCurrency, Network, SwapAmount, DecimalString};

let mut client = SwapServiceClient::connect("http://localhost:5003").await?;

let request = Request::new(EstimateSwapRequest {
    sending_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Bitcoin as i32,
            id: "0a03cf40".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000000000000000000000000000".to_string(),
    }),
    receiving_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Evm as i32,
            id: "11155111".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000".to_string(),
    }),
    amount: Some(SwapAmount {
        amount: Some(your_package::swap_amount::Amount::From(your_package::swap_amount::From {
            amount: Some(DecimalString { value: "0.01".to_string() }),
        })),
    }),
});

let response = client.estimate_swap(request).await?.into_inner();

if let Some(match_) = response.order_match {
    println!("Sending: {}", match_.sending_amount);
    println!("Receiving: {}", match_.receiving_amount);
    println!("Price: {}", match_.price);
} else {
    println!("No liquidity available");
}

const request = new SwapRequest()
request.setSendingCurrency({
  network: { protocol: 1, id: '0a03cf40' },
  assetId: '0x0000000000000000000000000000000000000000000000000000000000000000'
})
request.setReceivingCurrency({
  network: { protocol: 2, id: '11155111' },
  assetId: '0x0000000000000000000000000000000000000000'
})
request.setAmount({
  from: { amount: { value: '1000000' } }
})

const response = await client.swap(request, {})
const orderId = response.getOrderId()
console.log('Swap order created:', orderId)

req := &pb.SwapRequest{
    SendingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_BITCOIN,
            Id:       "0a03cf40",
        },
        AssetId: "0x0000000000000000000000000000000000000000000000000000000000000000",
    },
    ReceivingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_EVM,
            Id:       "11155111",
        },
        AssetId: "0x0000000000000000000000000000000000000000",
    },
    Amount: &pb.SwapAmount{
        Amount: &pb.SwapAmount_From_{From: &pb.SwapAmount_From{Amount: &pb.DecimalString{Value: "1000000"}}},
    },
}

resp, err := client.Swap(context.Background(), req)
if err != nil {
    log.Fatalf("Error: %v", err)
}

orderId := resp.GetOrderId()
log.Printf("Swap order created: %s", orderId)

let request = Request::new(SwapRequest {
    sending_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Bitcoin as i32,
            id: "0a03cf40".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000000000000000000000000000".to_string(),
    }),
    receiving_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Evm as i32,
            id: "11155111".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000".to_string(),
    }),
    amount: Some(SwapAmount {
        amount: Some(your_package::swap_amount::Amount::From(swap_amount::From { amount: Some(DecimalString { value: "1000000".to_string() }) })),
    }),
});

let response = client.swap(request).await?.into_inner();
let order_id = response.order_id;
println!("Swap order created: {}", order_id);

const request = new SimpleSwapRequest()
request.setSendingCurrency({
  network: { protocol: 1, id: '0a03cf40' },
  assetId: '0x0000000000000000000000000000000000000000000000000000000000000000'
})
request.setReceivingCurrency({
  network: { protocol: 2, id: '11155111' },
  assetId: '0x0000000000000000000000000000000000000000'
})
request.setAmount({
  from: { amount: { value: '10000000' } }
})
request.setPriceChangeTolerance('0.01')
request.setWithdrawSendingFunds(false)
request.setWithdrawReceivingFunds(true)

const response = await client.simpleSwap(request, {})
const output = response.getOutput()
const swapId = output.getSimpleSwapId()

console.log('Simple swap started:', swapId)

if (output.hasInstant()) {
  const instant = output.getInstant()
  console.log('Swap order:', instant.getOrderId())
}

if (output.hasDeferred()) {
  console.log('Setting up channels...')
  console.log('Subscribe to updates with SubscribeSimpleSwaps')
}

req := &pb.SimpleSwapRequest{
    SendingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_BITCOIN,
            Id:       "0a03cf40",
        },
        AssetId: "0x0000000000000000000000000000000000000000000000000000000000000000",
    },
    ReceivingCurrency: &pb.OrderbookCurrency{
        Network: &pb.Network{
            Protocol: pb.Protocol_PROTOCOL_EVM,
            Id:       "11155111",
        },
        AssetId: "0x0000000000000000000000000000000000000000",
    },
    Amount: &pb.SwapAmount{
        Amount: &pb.SwapAmount_From_{From: &pb.SwapAmount_From{Amount: &pb.DecimalString{Value: "10000000"}}},
    },
    PriceChangeTolerance:   "0.01",
    WithdrawSendingFunds:   false,
    WithdrawReceivingFunds: true,
}

resp, err := client.SimpleSwap(context.Background(), req)
if err != nil {
    log.Fatalf("Error: %v", err)
}

output := resp.GetOutput()
swapId := output.GetSimpleSwapId()

log.Printf("Simple swap started: %s", swapId)

if instant := output.GetInstant(); instant != nil {
    log.Printf("Swap order: %s", instant.GetOrderId())
}

if output.GetDeferred() != nil {
    log.Println("Setting up channels...")
    log.Println("Subscribe to updates with SubscribeSimpleSwaps")
}

let request = Request::new(SimpleSwapRequest {
    sending_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Bitcoin as i32,
            id: "0a03cf40".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000000000000000000000000000".to_string(),
    }),
    receiving_currency: Some(OrderbookCurrency {
        network: Some(Network {
            protocol: Protocol::Evm as i32,
            id: "11155111".to_string(),
        }),
        asset_id: "0x0000000000000000000000000000000000000000".to_string(),
    }),
    amount: Some(SwapAmount {
        amount: Some(your_package::swap_amount::Amount::From(swap_amount::From { amount: Some(DecimalString { value: "10000000".to_string() }) })),
    }),
    price_change_tolerance: "0.01".to_string(),
    withdraw_sending_funds: false,
    withdraw_receiving_funds: true,
});

let response = client.simple_swap(request).await?.into_inner();
let output = response.output.unwrap();
let swap_id = output.simple_swap_id;

println!("Simple swap started: {}", swap_id);

match output.output {
    Some(Output::Instant(instant)) => {
        println!("Swap order: {}", instant.order_id);
    }
    Some(Output::Deferred(_)) => {
        println!("Setting up channels...");
        println!("Subscribe to updates with SubscribeSimpleSwaps");
    }
    _ => {}
}

const request = new SubscribeSimpleSwapsRequest()
const stream = client.subscribeSimpleSwaps(request, {})

stream.on('data', (update) => {
  const timestamp = update.getTimestamp()
  const swapId = update.getSimpleSwapId()

  if (update.hasFundingSendingChannel()) {
    const funding = update.getFundingSendingChannel()
    console.log(`[${swapId}] Funding channel ${funding.getChannelId()}`)
    console.log(`  TX: ${funding.getTxid()}`)
    console.log(`  Amount: ${funding.getAmount()}`)
  }

  if (update.hasLeasingReceivingChannel()) {
    const renting = update.getLeasingReceivingChannel()
    console.log(`[${swapId}] Renting channel ${renting.getChannelId()}`)
    console.log(`  TX: ${renting.getTxid()}`)
  }

  if (update.hasSendingChannelReady()) {
    console.log(`[${swapId}] Sending channel ready`)
  }

  if (update.hasReceivingChannelReady()) {
    console.log(`[${swapId}] Receiving channel ready`)
  }

  if (update.hasWaitingForBalances()) {
    const waiting = update.getWaitingForBalances()
    console.log(`[${swapId}] Waiting for balances...`)
    console.log(`  Need sending: ${waiting.getNeededSending()}`)
    console.log(`  Need receiving: ${waiting.getNeededReceiving()}`)
  }

  if (update.hasBalancesReady()) {
    console.log(`[${swapId}] Balances ready!`)
  }

  if (update.hasOrderCreated()) {
    const order = update.getOrderCreated()
    console.log(`[${swapId}] Order created: ${order.getOrderId()}`)
  }

  if (update.hasOrderCompleted()) {
    const completed = update.getOrderCompleted()
    console.log(`[${swapId}] Order completed!`)
    console.log(`  Sent: ${completed.getSentAmount()}`)
    console.log(`  Received: ${completed.getReceivedAmount()}`)
  }

  if (update.hasWithdrawingReceivingFunds()) {
    const withdrawing = update.getWithdrawingReceivingFunds()
    console.log(`[${swapId}] Withdrawing funds...`)
    console.log(`  TXs: ${withdrawing.getTxidsList()}`)
  }

  if (update.hasSimpleSwapCompleted()) {
    console.log(`[${swapId}] ✓ Swap completed successfully!`)
  }

  if (update.hasSimpleSwapError()) {
    const error = update.getSimpleSwapError()
    console.error(`[${swapId}] ✗ Error: ${error.getError()}`)
  }
})

stream.on('error', (err) => console.error('Stream error:', err))

req := &pb.SubscribeSimpleSwapsRequest{}
stream, err := client.SubscribeSimpleSwaps(context.Background(), req)
if err != nil {
    log.Fatalf("Error: %v", err)
}

for {
    update, err := stream.Recv()
    if err != nil {
        log.Printf("Stream error: %v", err)
        break
    }

    swapId := update.GetSimpleSwapId()

    if funding := update.GetFundingSendingChannel(); funding != nil {
        log.Printf("[%s] Funding channel %s", swapId, funding.GetChannelId())
        log.Printf("  TX: %s", funding.GetTxid())
        log.Printf("  Amount: %s", funding.GetAmount())
    }

    if renting := update.GetLeasingReceivingChannel(); renting != nil {
        log.Printf("[%s] Renting channel %s", swapId, renting.GetChannelId())
        log.Printf("  TX: %s", renting.GetTxid())
    }

    if update.GetSendingChannelReady() != nil {
        log.Printf("[%s] Sending channel ready", swapId)
    }

    if update.GetReceivingChannelReady() != nil {
        log.Printf("[%s] Receiving channel ready", swapId)
    }

    if waiting := update.GetWaitingForBalances(); waiting != nil {
        log.Printf("[%s] Waiting for balances...", swapId)
        log.Printf("  Need sending: %s", waiting.GetNeededSending())
        log.Printf("  Need receiving: %s", waiting.GetNeededReceiving())
    }

    if update.GetBalancesReady() != nil {
        log.Printf("[%s] Balances ready!", swapId)
    }

    if order := update.GetOrderCreated(); order != nil {
        log.Printf("[%s] Order created: %s", swapId, order.GetOrderId())
    }

    if completed := update.GetOrderCompleted(); completed != nil {
        log.Printf("[%s] Order completed!", swapId)
        log.Printf("  Sent: %s", completed.GetSentAmount())
        log.Printf("  Received: %s", completed.GetReceivedAmount())
    }

    if withdrawing := update.GetWithdrawingReceivingFunds(); withdrawing != nil {
        log.Printf("[%s] Withdrawing funds...", swapId)
        log.Printf("  TXs: %v", withdrawing.GetTxids())
    }

    if update.GetSimpleSwapCompleted() != nil {
        log.Printf("[%s] Swap completed successfully!", swapId)
    }

    if swapError := update.GetSimpleSwapError(); swapError != nil {
        log.Printf("[%s] Error: %s", swapId, swapError.GetError())
    }
}

let request = Request::new(SubscribeSimpleSwapsRequest {});
let mut stream = client.subscribe_simple_swaps(request).await?.into_inner();

while let Some(update) = stream.message().await? {
    let swap_id = &update.simple_swap_id;

    if let Some(funding) = &update.funding_sending_channel {
        println!("[{}] Funding channel {}", swap_id, funding.channel_id);
        println!("  TX: {}", funding.txid);
        println!("  Amount: {}", funding.amount);
    }

    if let Some(renting) = &update.leasing_receiving_channel {
        println!("[{}] Renting channel {}", swap_id, renting.channel_id);
        println!("  TX: {}", renting.txid);
    }

    if update.sending_channel_ready.is_some() {
        println!("[{}] Sending channel ready", swap_id);
    }

    if update.receiving_channel_ready.is_some() {
        println!("[{}] Receiving channel ready", swap_id);
    }

    if let Some(waiting) = &update.waiting_for_balances {
        println!("[{}] Waiting for balances...", swap_id);
        println!("  Need sending: {}", waiting.needed_sending);
        println!("  Need receiving: {}", waiting.needed_receiving);
    }

    if update.balances_ready.is_some() {
        println!("[{}] Balances ready!", swap_id);
    }

    if let Some(order) = &update.order_created {
        println!("[{}] Order created: {}", swap_id, order.order_id);
    }

    if let Some(completed) = &update.order_completed {
        println!("[{}] Order completed!", swap_id);
        println!("  Sent: {}", completed.sent_amount);
        println!("  Received: {}", completed.received_amount);
    }

    if let Some(withdrawing) = &update.withdrawing_receiving_funds {
        println!("[{}] Withdrawing funds...", swap_id);
        println!("  TXs: {:?}", withdrawing.txids);
    }

    if update.simple_swap_completed.is_some() {
        println!("[{}] Swap completed successfully!", swap_id);
    }

    if let Some(error) = &update.simple_swap_error {
        eprintln!("[{}] Error: {}", swap_id, error.error);
    }
}

async function oneClickSwap(
  client: SwapServiceClient,
  fromCurrency: OrderbookCurrency,
  toCurrency: OrderbookCurrency,
  amount: string,
  withdrawToWallet: boolean = true
) {
  // 1. Estimate
  const estimateReq = new EstimateSimpleSwapRequest()
  estimateReq.setSendingCurrency(fromCurrency)
  estimateReq.setReceivingCurrency(toCurrency)
  estimateReq.setAmount({ sending: { value: amount } })
  estimateReq.setPriceChangeTolerance('0.02') // 2% max slippage
  estimateReq.setWithdrawSendingFunds(false)
  estimateReq.setWithdrawReceivingFunds(withdrawToWallet)

  const estimate = await client.estimateSimpleSwap(estimateReq, {})

  if (estimate.getEstimate().hasNoLiquidity()) {
    throw new Error('No liquidity available')
  }
  if (estimate.getEstimate().hasFeesHigherThanAmount()) {
    throw new Error('Setup fees would exceed the swap amount')
  }
  if (estimate.getEstimate().hasLeaseTooBig()) {
    const ltb = estimate.getEstimate().getLeaseTooBig()
    throw new Error(
      `Lease unavailable — needed ${ltb?.getNeededLease()?.getValue()}, ` +
      `have ${ltb?.getAvailableLeaseLiquidity()?.getValue()}`
    )
  }

  // 2. Execute
  const swapReq = new SimpleSwapRequest()
  swapReq.setSendingCurrency(fromCurrency)
  swapReq.setReceivingCurrency(toCurrency)
  swapReq.setAmount({ sending: { value: amount } })
  swapReq.setPriceChangeTolerance('0.02')
  swapReq.setWithdrawSendingFunds(false)
  swapReq.setWithdrawReceivingFunds(withdrawToWallet)

  const response = await client.simpleSwap(swapReq, {})
  return response.getOutput().getSimpleSwapId()
}

// Example usage
const swapId = await oneClickSwap(
  client,
  btcCurrency,
  ethCurrency,
  '10000000', // 0.1 BTC
  true // Auto-withdraw ETH to wallet
)

console.log('Swap started:', swapId)
console.log('Monitor progress with SubscribeSimpleSwaps')

func oneClickSwap(
    client pb.SwapServiceClient,
    fromCurrency *pb.OrderbookCurrency,
    toCurrency *pb.OrderbookCurrency,
    amount string,
    withdrawToWallet bool,
) (string, error) {
    // 1. Estimate
    estimateReq := &pb.EstimateSimpleSwapRequest{
        SendingCurrency:   fromCurrency,
        ReceivingCurrency: toCurrency,
        Amount: &pb.SwapAmount{
            Amount: &pb.SwapAmount_From_{From: &pb.SwapAmount_From{Amount: &pb.DecimalString{Value: amount}}},
        },
        PriceChangeTolerance:   "0.02", // 2% max slippage
        WithdrawSendingFunds:   false,
        WithdrawReceivingFunds: withdrawToWallet,
    }

    estimate, err := client.EstimateSimpleSwap(context.Background(), estimateReq)
    if err != nil {
        return "", err
    }

    if estimate.GetEstimate().GetNoLiquidity() != nil {
        return "", fmt.Errorf("no liquidity available")
    }
    if estimate.GetEstimate().GetFeesHigherThanAmount() != nil {
        return "", fmt.Errorf("setup fees would exceed the swap amount")
    }
    if ltb := estimate.GetEstimate().GetLeaseTooBig(); ltb != nil {
        return "", fmt.Errorf("lease unavailable — needed %s, have %s",
            ltb.GetNeededLease().GetValue(),
            ltb.GetAvailableLeaseLiquidity().GetValue())
    }

    // 2. Execute
    swapReq := &pb.SimpleSwapRequest{
        SendingCurrency:        fromCurrency,
        ReceivingCurrency:      toCurrency,
        Amount: &pb.SwapAmount{
            Amount: &pb.SwapAmount_From_{From: &pb.SwapAmount_From{Amount: &pb.DecimalString{Value: amount}}},
        },
        PriceChangeTolerance:   "0.02",
        WithdrawSendingFunds:   false,
        WithdrawReceivingFunds: withdrawToWallet,
    }

    response, err := client.SimpleSwap(context.Background(), swapReq)
    if err != nil {
        return "", err
    }

    return response.GetOutput().GetSimpleSwapId(), nil
}

// Example usage
swapId, err := oneClickSwap(
    client,
    btcCurrency,
    ethCurrency,
    "10000000", // 0.1 BTC
    true,       // Auto-withdraw ETH to wallet
)
if err != nil {
    log.Fatalf("Error: %v", err)
}

log.Printf("Swap started: %s", swapId)
log.Println("Monitor progress with SubscribeSimpleSwaps")

async fn one_click_swap(
    client: &mut SwapServiceClient<Channel>,
    from_currency: OrderbookCurrency,
    to_currency: OrderbookCurrency,
    amount: String,
    withdraw_to_wallet: bool,
) -> Result<String, Box<dyn std::error::Error>> {
    // 1. Estimate
    let estimate_req = Request::new(EstimateSimpleSwapRequest {
        sending_currency: Some(from_currency.clone()),
        receiving_currency: Some(to_currency.clone()),
        amount: Some(SwapAmount {
            amount: Some(your_package::swap_amount::Amount::From(swap_amount::From { amount: Some(DecimalString { value: amount.clone().to_string() }) })),
        }),
        price_change_tolerance: "0.02".to_string(), // 2% max slippage
        withdraw_sending_funds: false,
        withdraw_receiving_funds: withdraw_to_wallet,
    });

    let estimate = client.estimate_simple_swap(estimate_req).await?.into_inner();

    match &estimate.estimate.as_ref().unwrap().estimate {
        Some(Estimate::NoLiquidity(_)) => {
            return Err("No liquidity available".into());
        }
        Some(Estimate::FeesHigherThanAmount(_)) => {
            return Err("Setup fees would exceed the swap amount".into());
        }
        Some(Estimate::LeaseTooBig(ltb)) => {
            return Err(format!(
                "Lease unavailable — needed {}, have {}",
                ltb.needed_lease.as_ref().unwrap().value,
                ltb.available_lease_liquidity.as_ref().unwrap().value
            ).into());
        }
        _ => {}
    }

    // 2. Execute
    let swap_req = Request::new(SimpleSwapRequest {
        sending_currency: Some(from_currency),
        receiving_currency: Some(to_currency),
        amount: Some(SwapAmount {
            amount: Some(your_package::swap_amount::Amount::From(swap_amount::From { amount: Some(DecimalString { value: amount.to_string() }) })),
        }),
        price_change_tolerance: "0.02".to_string(),
        withdraw_sending_funds: false,
        withdraw_receiving_funds: withdraw_to_wallet,
    });

    let response = client.simple_swap(swap_req).await?.into_inner();
    Ok(response.output.unwrap().simple_swap_id)
}

// Example usage
let swap_id = one_click_swap(
    &mut client,
    btc_currency,
    eth_currency,
    "10000000".to_string(), // 0.1 BTC
    true,                    // Auto-withdraw ETH to wallet
).await?;

println!("Swap started: {}", swap_id);
println!("Monitor progress with SubscribeSimpleSwaps");

async function waitForSwapCompletion(
  client: SwapServiceClient,
  swapId: string
): Promise<void> {
  return new Promise((resolve, reject) => {
    const stream = client.subscribeSimpleSwaps(new SubscribeSimpleSwapsRequest(), {})

    stream.on('data', (update) => {
      if (update.getSimpleSwapId() !== swapId) return

      if (update.hasSimpleSwapCompleted()) {
        stream.cancel()
        resolve()
      }

      if (update.hasSimpleSwapError()) {
        stream.cancel()
        reject(new Error(update.getSimpleSwapError()?.getError()))
      }
    })

    stream.on('error', (err) => reject(err))
  })
}

// Usage
try {
  await waitForSwapCompletion(client, swapId)
  console.log('Swap completed successfully!')
} catch (error) {
  console.error('Swap failed:', error.message)
}

func waitForSwapCompletion(
    client pb.SwapServiceClient,
    swapId string,
) error {
    req := &pb.SubscribeSimpleSwapsRequest{}
    stream, err := client.SubscribeSimpleSwaps(context.Background(), req)
    if err != nil {
        return err
    }

    for {
        update, err := stream.Recv()
        if err != nil {
            return err
        }

        if update.GetSimpleSwapId() != swapId {
            continue
        }

        if update.GetSimpleSwapCompleted() != nil {
            return nil
        }

        if swapError := update.GetSimpleSwapError(); swapError != nil {
            return fmt.Errorf("swap error: %s", swapError.GetError())
        }
    }
}

// Usage
err := waitForSwapCompletion(client, swapId)
if err != nil {
    log.Printf("Swap failed: %v", err)
} else {
    log.Println("Swap completed successfully!")
}

async fn wait_for_swap_completion(
    client: &mut SwapServiceClient<Channel>,
    swap_id: String,
) -> Result<(), Box<dyn std::error::Error>> {
    let request = Request::new(SubscribeSimpleSwapsRequest {});
    let mut stream = client.subscribe_simple_swaps(request).await?.into_inner();

    while let Some(update) = stream.message().await? {
        if update.simple_swap_id != swap_id {
            continue;
        }

        if update.simple_swap_completed.is_some() {
            return Ok(());
        }

        if let Some(error) = update.simple_swap_error {
            return Err(format!("Swap error: {}", error.error).into());
        }
    }

    Err("Stream ended unexpectedly".into())
}

// Usage
match wait_for_swap_completion(&mut client, swap_id).await {
    Ok(_) => println!("Swap completed successfully!"),
    Err(e) => eprintln!("Swap failed: {}", e),
}

// Formula: (max_tolerated_price - intended_price) / intended_price

// Example: BTC/ETH at 28.5 ETH per BTC
// With 1% tolerance (0.01):
// - Max buy price: 28.5 * 1.01 = 28.785 ETH/BTC
// - Min sell price: 28.5 * 0.99 = 28.215 ETH/BTC

request.setPriceChangeTolerance('0.01') // 1% tolerance

// Formula: (max_tolerated_price - intended_price) / intended_price

// Example: BTC/ETH at 28.5 ETH per BTC
// With 1% tolerance (0.01):
// - Max buy price: 28.5 * 1.01 = 28.785 ETH/BTC
// - Min sell price: 28.5 * 0.99 = 28.215 ETH/BTC

request.PriceChangeTolerance = "0.01" // 1% tolerance

// Formula: (max_tolerated_price - intended_price) / intended_price

// Example: BTC/ETH at 28.5 ETH per BTC
// With 1% tolerance (0.01):
// - Max buy price: 28.5 * 1.01 = 28.785 ETH/BTC
// - Min sell price: 28.5 * 0.99 = 28.215 ETH/BTC

request.price_change_tolerance = "0.01".to_string(); // 1% tolerance