API Reference

Complete API documentation for @tetherto/wdk-protocol-swap-stonfi-ton

Table of Contents

Class	Description	Methods
StonFiProtocolTon	Main class for swapping tokens on StonFi DEX on TON blockchain. Extends SwapProtocol from @tetherto/wdk-wallet/protocols.	Constructor - Creates swap service swap(options, config?) - Swaps tokens on StonFi DEX quoteSwap(options, config?) - Gets the cost of a swap operation without doing it

StonFiProtocolTon

The main class for swapping tokens on StonFi DEX on TON blockchain. Extends SwapProtocol from @tetherto/wdk-wallet/protocols.

Constructor

new StonFiProtocolTon(account, config?)

Parameters:

• account (WalletAccountTon | WalletAccountTonGasless | WalletAccountReadOnlyTon | WalletAccountReadOnlyTonGasless): The wallet account to use for swap operations

• config (SwapProtocolConfig, optional): Configuration object

  • swapMaxFee (bigint, optional): Maximum total swap cost in nanotons

Example:

import StonFiProtocolTon from '@tetherto/wdk-protocol-swap-stonfi-ton'
import { WalletAccountTon } from '@tetherto/wdk-wallet-ton'

const account = new WalletAccountTon(seedPhrase, {
  tonApiKey: 'YOUR_TON_API_KEY',
  tonApiEndpoint: 'YOUR_TON_API_ENDPOINT'
})

const swapProtocol = new StonFiProtocolTon(account, {
  swapMaxFee: 1000000000n // Maximum swap fee in nanotons
})

Methods

Method	Description	Returns	Throws
swap(options, config?)	Swaps tokens on StonFi DEX	Promise<SwapResult>	If no TON connection or fee exceeds max
quoteSwap(options, config?)	Gets the cost of a swap operation	Promise<Omit<SwapResult, 'hash'>>	If no TON connection

swap(options, config?)

Swaps tokens on StonFi DEX using the StonFi protocol.

Parameters:

• options (StonFiSwapOptions): Swap operation options

  • tokenIn (string): Token to sell (use 'ton' for native TON or jetton address)

  • tokenOut (string): Token to buy (use 'ton' for native TON or jetton address)

  • tokenInAmount (bigint, optional): Amount to sell in token base units

  • tokenOutAmount (bigint, optional): Exact amount to buy in token base units

  • slippageTolerance (number, optional): Max price change allowed (default: 0.0001 = 0.01%)

  • to (string, optional): Address to send bought tokens (default: your address)

• config (Pick<TonGaslessWalletConfig, 'paymasterToken'> & Pick<SwapProtocolConfig, 'swapMaxFee'>, optional): Override settings for gasless accounts

  • paymasterToken (string, optional): Token to use for paying fees

  • swapMaxFee (bigint, optional): Override maximum swap fee

Returns: Promise<SwapResult> - Swap operation result

Throws:

• Error if account is read-only

• Error if no TON connection is set up

• Error if swap fee goes over maximum allowed

• Error if no liquidity pool found for token pair

• Error if gasless account tries to swap native TON

Example:

// Standard TON account - TON to jetton
const result = await swapProtocol.swap({
  tokenIn: 'ton',
  tokenOut: 'JETTON_TOKEN_ADDRESS',
  tokenInAmount: 1000000000n, // 1 TON
  slippageTolerance: 0.01 // 1%
})

console.log('Swap hash:', result.hash)
console.log('Total fee:', result.fee)
console.log('Tokens sold:', result.tokenInAmount)
console.log('Tokens bought:', result.tokenOutAmount)

// Gasless TON account - jetton to jetton only
const result2 = await swapProtocol.swap({
  tokenIn: 'USDT_TOKEN_ADDRESS',
  tokenOut: 'USDT_TOKEN_ADDRESS',
  tokenInAmount: 1000000n // 1 USD₮
}, {
  paymasterToken: 'USDT', // Token used to pay fees
  swapMaxFee: 1000000000n
})

console.log('Swap hash:', result2.hash)
console.log('Total fee:', result2.fee)
console.log('Tokens sold:', result2.tokenInAmount)
console.log('Tokens bought:', result2.tokenOutAmount)

// Exact output swap
const result3 = await swapProtocol.swap({
  tokenIn: 'ton',
  tokenOut: 'JETTON_TOKEN_ADDRESS',
  tokenOutAmount: 1000000n, // Exact amount to buy
  slippageTolerance: 0.005 // 0.5%
})

console.log('TON sold:', result3.tokenInAmount, 'nanotons')
console.log('Tokens bought:', result3.tokenOutAmount)

quoteSwap(options, config?)

Gets the cost of a swap operation without doing it.

Parameters:

• options (StonFiSwapOptions): Swap operation options (same as swap method)

• config (Pick<TonGaslessWalletConfig, 'paymasterToken'>, optional): Override settings for gasless accounts

  • paymasterToken (string, optional): Token to use for paying fees

Returns: Promise<Omit<SwapResult, 'hash'>> - Swap cost estimate

Throws: Error if no TON connection is set up

Example:

const quote = await swapProtocol.quoteSwap({
  tokenIn: 'ton',
  tokenOut: 'JETTON_TOKEN_ADDRESS',
  tokenInAmount: 1000000000n
})

console.log('Fee:', quote.fee, 'nanotons')
console.log('Tokens sold:', quote.tokenInAmount, 'nanotons')
console.log('Tokens bought:', quote.tokenOutAmount)

// Check if swap is good
if (quote.fee > 500000000n) {
  console.log('Swap fees too high')
} else {
  // Do swap
  const result = await swapProtocol.swap({
    tokenIn: 'ton',
    tokenOut: 'JETTON_TOKEN_ADDRESS',
    tokenInAmount: 1000000000n
  })
}

Types

StonFiSwapOptions

interface StonFiSwapOptions {
  tokenIn: string;                      // Token to sell
  tokenOut: string;                     // Token to buy
  tokenInAmount?: bigint;               // Amount to sell (use this OR tokenOutAmount)
  tokenOutAmount?: bigint;              // Exact amount to buy (use this OR tokenInAmount)
  slippageTolerance?: number;           // Max price change (default: 0.0001)
  to?: string;                          // Where to send bought tokens (optional)
}

SwapResult

interface SwapResult {
  hash: string;                         // Swap transaction hash
  fee: bigint;                          // Total cost in nanotons
  tokenInAmount: bigint;                // Actual tokens sold in base units
  tokenOutAmount: bigint;               // Actual tokens bought in base units
}

SwapProtocolConfig

interface SwapProtocolConfig {
  swapMaxFee?: bigint;                  // Maximum total swap cost in nanotons
}

TonGaslessWalletConfig

interface TonGaslessWalletConfig {
  paymasterToken?: string;              // Token to use for paying fees
}

Supported Network

The swap service supports TON blockchain:

Source and Target Network:

• 'ton' - TON blockchain with StonFi DEX

Token Support:

• Native TON (use 'ton' string)

• All jetton tokens available on StonFi DEX

• Token addresses are TON jetton contract addresses

Note: Gasless accounts can only swap jetton-to-jetton pairs. TON-to-jetton and jetton-to-TON swaps need standard accounts.

Error Handling

The swap service throws specific errors for different problems:

try {
  const result = await swapProtocol.swap({
    tokenIn: 'ton',
    tokenOut: 'JETTON_TOKEN_ADDRESS',
    tokenInAmount: 1000000000n
  })
} catch (error) {
  if (error.message.includes('liquidity pool')) {
    console.error('No liquidity for this token pair')
  }
  if (error.message.includes('max fee')) {
    console.error('Swap fee too high')
  }
  if (error.message.includes('ton center')) {
    console.error('TON connection problem')
  }
  if (error.message.includes('non read-only account')) {
    console.error('Cannot swap with read-only account')
  }
  if (error.message.includes('gasless')) {
    console.error('Gasless accounts cannot swap TON')
  }
}

Usage Examples

Basic Swap Operation

import StonFiProtocolTon from '@tetherto/wdk-protocol-swap-stonfi-ton'
import { WalletAccountTon } from '@tetherto/wdk-wallet-ton'

async function swapTokens() {
  // Create wallet account
  const account = new WalletAccountTon(seedPhrase, {
    tonApiKey: 'YOUR_TON_API_KEY',
    tonApiEndpoint: 'YOUR_TON_API_ENDPOINT'
  })
  
  // Create swap service
  const swapProtocol = new StonFiProtocolTon(account, {
    swapMaxFee: 1000000000n
  })
  
  // Get quote first
  const quote = await swapProtocol.quoteSwap({
    tokenIn: 'ton',
    tokenOut: 'JETTON_TOKEN_ADDRESS',
    tokenInAmount: 1000000000n
  })
  
  console.log('Swap quote:', quote)
  
  // Do swap
  const result = await swapProtocol.swap({
    tokenIn: 'ton',
    tokenOut: 'JETTON_TOKEN_ADDRESS',
    tokenInAmount: 1000000000n,
    slippageTolerance: 0.01
  })
  
  console.log('Swap result:', result)
  
  return result
}

Multiple Token Swaps

async function swapMultipleTokens(swapProtocol) {
  const swaps = [
    { tokenIn: 'ton', tokenOut: 'USDT_ADDRESS', amount: 1000000000n },
    { tokenIn: 'USDT_ADDRESS', tokenOut: 'USDT_ADDRESS', amount: 1000000n },
    { tokenIn: 'USDT_ADDRESS', tokenOut: 'ton', amount: 1000000n }
  ]
  
  const results = []
  
  for (const swap of swaps) {
    try {
      // Get quote
      const quote = await swapProtocol.quoteSwap({
        tokenIn: swap.tokenIn,
        tokenOut: swap.tokenOut,
        tokenInAmount: swap.amount
      })
      
      console.log(`Swap ${swap.tokenIn} to ${swap.tokenOut}:`, quote)
      
      // Do swap
      const result = await swapProtocol.swap({
        tokenIn: swap.tokenIn,
        tokenOut: swap.tokenOut,
        tokenInAmount: swap.amount,
        slippageTolerance: 0.01
      })
      
      results.push({ swap, result })
      console.log(`Swap ${swap.tokenIn} to ${swap.tokenOut} successful:`, result.hash)
      
    } catch (error) {
      console.error(`Swap ${swap.tokenIn} to ${swap.tokenOut} failed:`, error.message)
    }
  }
  
  return results
}

Gasless Swap

import { WalletAccountTonGasless } from '@tetherto/wdk-wallet-ton-gasless'

async function gaslessSwap() {
  // Create gasless account
  const account = new WalletAccountTonGasless(seedPhrase, {
    tonApiKey: 'YOUR_TON_API_KEY',
    tonApiEndpoint: 'YOUR_TON_API_ENDPOINT',
    paymasterToken: 'USDT'
  })
  
  // Create swap service
  const swapProtocol = new StonFiProtocolTon(account, {
    swapMaxFee: 1000000000n
  })
  
  // Swap jetton to jetton with no TON fees
  const result = await swapProtocol.swap({
    tokenIn: 'USDT_TOKEN_ADDRESS',
    tokenOut: 'USDT_TOKEN_ADDRESS',
    tokenInAmount: 1000000n
  }, {
    paymasterToken: 'USDT' // Use USDT to pay fees
  })
  
  console.log('Gasless swap result:', result)
  return result
}

Node.js Quickstart

Get started with WDK in a Node.js environment

WDK Stonfi Swap Protocol Configuration

Get started with WDK's Stonfi Swap Protocol configuration

WDK Stonfi Swap Protocol Usage

Get started with WDK's Stonfi Swap Protocol usage

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