Swap & Unwrap (EVM/TON → BTC)

swapAndUnwrap takes a token on a target network and delivers BTC on Bitcoin.

1. Estimate the output

import BigNumber from 'bignumber.js';

const networkName = 'optimism';
const exchangeInfo = {
  inputToken: 'Token Contract Address',
  inputAmount: new BigNumber('50').multipliedBy(10 ** 18).toFixed(0), // 50 tokens, 18 decimals
};

const estimate = await sdk.swapAndUnwrapEstimate(exchangeInfo, networkName);
console.log(estimate.outputAmountBTC, estimate.teleswapFee);

For TON, use swapAndUnwrapEstimateTon(exchangeInfo) (TON amounts use 9 decimals).

2. Get the contract-call inputs

swapAndUnwrap settles by calling a contract on the source network. Get the inputs, then call the contract directly from your wallet/app.

const exchangeInfo = {
  inputToken: 'Token Contract Address',
  inputAmount: new BigNumber('50').multipliedBy(10 ** 18).toFixed(0),
};
const network = 'optimism';
const minimumExpectedBTCAmount = '0'; // tx fails if received BTC < this

const inputs = await sdk.swapAndUnwrapInputs(
  exchangeInfo,
  btcAddress,
  network,
  minimumExpectedBTCAmount,
);

For TON, use swapAndUnwrapInputsTon(...).

Which contract do I call?

• Base networks (Polygon, BNB) → call the BurnRouter contract.
• Cross-chain networks (Ethereum, Optimism, Arbitrum, Base, Unichain) → call the EthConnector contract.

You must first approve the contract to spend an amount equal to your input.

Contract ABIs & addresses

import { ABI } from '@teleportdao/contracts-helper';
import { teleswap } from '@teleportdao/configs';

const ccBurnABI = ABI.CCBurnRouterABI;           // BurnRouter
const connectorABI = ABI.TeleswapEthConnectorABI; // EthConnector

// BurnRouter addresses (base networks)
const polygonCCBurn = teleswap.contracts.polygon.mainnet.ccBurnAddress;
const bscCCBurn = teleswap.contracts.bsc.mainnet.ccBurnAddress;

// Connector addresses (cross-chain networks)
const ethConnector = teleswap.connectors.ethereum.mainnet.connectorAddress;
const opConnector = teleswap.connectors.optimism.mainnet.connectorAddress;
// ...arbitrum, base, unichain

REST equivalents

Stage	EVM endpoint	TON endpoint
Estimate	POST .../swap-and-unwrap-estimate	POST .../swap-and-unwrap-estimate-ton
Build	POST .../swap-and-unwrap-inputs	POST .../swap-and-unwrap-inputs-ton

See the API reference.