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Overview

Private swaps route through multiple CEX hops to provide maximum privacy. Like standard swaps, they use CEX tokens from the /tokens endpoint. Optionally uses Monero (XMR) for enhanced anonymity. This breaks transaction trails across exchanges, providing enhanced anonymity without requiring wallet connections.
Best For: Users who prioritize privacy and are willing to accept longer completion times (15-45 minutes) for enhanced anonymity.

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Key Features

Multi-Hop Routing

Routes through 2 exchanges to break transaction trail

Optional XMR Privacy Layer

Can use Monero for untraceable intermediate transactions

No Wallet Connection

No browser wallet or approvals required

Maximum Anonymity

No direct on-chain link between source and destination

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How It Works

Private swaps follow this multi-hop flow:
1

Get Supported Assets

Fetch available tokens from /tokens
2

Request Private Quote

Get a quote with anonymous: true to request private routing
3

Create Swap Order

Submit swap with destination address
4

Multi-Hop Routing

Funds route through multiple CEXs (optionally via Monero)
5

Privacy Delivery

Final output sent to destination with broken trail

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Integration Guide

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Step 1: Get Supported Assets

Before requesting a quote, fetch the available tokens. Learn more about CEX tokens.
Performance Note: The /tokens endpoint can take several seconds to minute to respond due to the large token list.
  • Save tokens in your backend database
  • Load tokens on server startup or via scheduled job
  • Serve token list from your database to frontend
  • Refresh cache periodically (e.g., every 24 hours)
const tokens = await fetchFromHoudini('/tokens');

console.log('Available tokens:', tokens.length);

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Step 2: Request Private Quote

Request a quote with anonymous: true for maximum privacy. Use token symbols from the /tokens endpoint: 
// Request a private quote
const quote = await fetchFromHoudini('/quote', {
  amount: '1',
  from: 'ETH',         // Token symbol from /tokens
  to: 'SOL',           // Token symbol from /tokens
  anonymous: 'true',   // Enable private routing
  useXmr: 'false'      // System decides XMR usage
});

console.log('Route type:', quote.type);      // "private"
console.log('Privacy hops:', quote.path);    // "se:cl" (multi-hop)
console.log('XMR amount:', quote.xmrAmount); // Amount routed via Monero
console.log('ETA:', quote.duration, 'minutes');

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Quote Response

{
  "amountOut": 23.6634,
  "amountIn": 1,
  "type": "private",
  "duration": 11,
  "path": "cl:qx",
  "xmrAmount": 38.231647970000004,
  "inQuoteId": "694cd4b5d924391f000561da",
  "outQuoteId": "694cd4b5d924391f000561e3",
  "quoteId": "694cd4b5d924391f000561e3",
  "amountOutUsd": 2893.323918,
  "rewardsAvailable": true
}
Key Private Route Fields:
  • type: "private" indicating multi-hop routing
  • path: Multi-hop CEX path (e.g., "cl:qx" = Changelly → Quickex)
  • xmrAmount: Amount routed through Monero privacy layer
  • inQuoteId / outQuoteId: Separate quotes for each hop
  • duration: Estimated time to complete the exchange, longer completion time (15-45 min) due to multi-hop

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Step 3: Create Private Swap

Create the swap order using the /exchange endpoint: 
// Create a private swap
const swapRequest = {
  amount: 1,
  from: 'ETH',
  to: 'SOL',
  addressTo: '1nc1nerator11111111111111111111111111111111',
  receiverTag: '',
  anonymous: true,   // Enable private routing
  ip: '192.168.1.1',
  userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
  timezone: 'America/New_York',
  useXmr: false
};

const response = await fetch(`${API_BASE_URL}/exchange`, {
  method: 'POST',
  headers: {
    'Authorization': `${API_KEY}:${API_SECRET}`,
    'Content-Type': 'application/json',
    'x-user-ip': swapRequest.ip,
    'x-user-agent': swapRequest.userAgent,
    'x-user-timezone': swapRequest.timezone
  },
  body: JSON.stringify(swapRequest)
});

const swap = await response.json();
console.log('Private swap created:', swap.houdiniId);
console.log('Deposit to:', swap.senderAddress);

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Exchange Response

{
  "houdiniId": "bwc5iKVeeW5GiQpLHCm65w",
  "created": "2025-12-25T06:13:21.293Z",
  "senderAddress": "0xA2fC2BD472aB6FAF3176EBcBCaeeC7f95F563Ada",
  "receiverAddress": "1nc1nerator11111111111111111111111111111111",
  "anonymous": true,
  "status": 0,
  "inAmount": 1,
  "inSymbol": "ETH",
  "outAmount": 23.66258493,
  "outSymbol": "SOL",
  "eta": 28,
  "expires": "2025-12-25T06:43:21.293Z",
  "quote": {
    "path": "se:cl",
    "xmrAmount": 10393.30176114,
    "type": "private"
  },
  "inStatus": 0,
  "outStatus": 0
}
Critical: Send exactly inAmount of inSymbol to the senderAddress within the expiration time (typically 30 minutes).

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Step 4: Monitor Swap Status

Poll the status endpoint to track the multi-hop progress: 
// Check swap status
const status = await fetchFromHoudini('/status', {
  id: swap.houdiniId
});

console.log('Overall status:', status.status);
console.log('Input leg:', status.inStatus);   // First hop status
console.log('Output leg:', status.outStatus); // Second hop status

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Private Swap Status Progression

Private swaps have additional status stages for multi-hop routing: 
0 (WAITING)
  ↓ User sends deposit
1 (CONFIRMING)
  ↓ Deposit confirmed
2 (EXCHANGING)
  ↓ First CEX hop processing
3 (ANONYMIZING)
  ↓ Routing through privacy layer (XMR)
  ↓ Second CEX hop processing
4 (COMPLETED)
Status Fields:
  • status: Overall swap status (0-8)
  • inStatus: First hop status
  • outStatus: Second hop status (private swaps only)
Polling: Check status every 30 seconds or more. Private swaps take 15-45 minutes due to multi-hop routing.

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Complete Example

For a complete, runnable Node.js example:

Private Swap Example

Complete private swap script with multi-hop status tracking

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Best Practices

Clearly communicate the 15-45 minute completion time for private swaps. Users should understand they’re trading speed for privacy.
Explain how multi-hop routing provides privacy benefits. Help users understand what they’re getting.
Implement proper loading states and progress indicators. Private swaps take longer due to multiple hops.

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Common Issues

Cause: Multi-hop routing through 2 exchanges takes longerSolution: This is normal for private swaps. Monitor inStatus and outStatus to see which hop is processing.
Question: “How private is this really?”Answer: Private swaps break the transaction trail by routing through multiple exchanges. When XMR routing is used, it adds an untraceable intermediate step. However, this is not absolute anonymity - compliance checks still apply.

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Next Steps

DEX Swaps

On-chain decentralized swaps

Order Lifecycle

Understand swap status progression

Routing Types

Learn about private vs standard routing