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getCheckoutTransactionQuote

Fetches a conversion quote for a checkout transaction. The quote includes fee breakdowns and the signing payload needed for on-chain execution. Call attachCheckoutTransactionSource before requesting a quote to specify the source wallet and chain.

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Usage

import { getCheckoutTransactionQuote } from '@dynamic-labs-sdk/client';

const transaction = await getCheckoutTransactionQuote({
  transactionId: 'txn_abc123',
  fromTokenAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', // USDC
});

console.log('Total fee:', transaction.quote.fees?.totalFeeUsd);

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Parameters

ParameterTypeDescription
transactionIdstringThe checkout transaction ID returned by createCheckoutTransaction.
fromTokenAddressstringThe contract address of the token the user is paying with.
fromChainIdstring (optional)Overrides the source chain ID recorded by attachCheckoutTransactionSource for this quote. The chain family (fromChainName) and source address (fromAddress) remain locked to the attached source — to switch chain families or wallets, call attachCheckoutTransactionSource again.
slippagenumber (optional)Maximum allowed slippage as a decimal (e.g., 0.005 for 0.5%).

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Returns

Promise<CheckoutTransaction> - The updated transaction with quote data populated: 
type CheckoutTransactionQuote = {
  estimatedTimeSec: number;          // Estimated execution time
  fees?: CheckoutFeeBreakdown;       // Fee details
  signingPayload: object;            // Data for on-chain signing
  // ... additional quote fields
};

type CheckoutFeeBreakdown = {
  totalFeeUsd?: string;              // Total fees in USD
  // ... individual fee components
};

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Examples

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Display quote to user

import {
  attachCheckoutTransactionSource,
  getCheckoutTransactionQuote,
  getActiveNetworkData,
} from '@dynamic-labs-sdk/client';

const getQuote = async (transactionId, walletAccount, tokenAddress) => {
  const { networkData } = await getActiveNetworkData({ walletAccount });

  // Attach source wallet
  await attachCheckoutTransactionSource({
    transactionId,
    fromAddress: walletAccount.address,
    fromChainId: networkData?.networkId ?? '',
    fromChainName: walletAccount.chain,
  });

  // Fetch quote
  const transaction = await getCheckoutTransactionQuote({
    transactionId,
    fromTokenAddress: tokenAddress,
  });

  const { quote } = transaction;
  console.log(`Amount: $${transaction.amount}`);
  console.log(`Fees: $${quote.fees?.totalFeeUsd ?? '0.00'}`);

  return transaction;
};

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With custom slippage

import { getCheckoutTransactionQuote } from '@dynamic-labs-sdk/client';

const transaction = await getCheckoutTransactionQuote({
  transactionId: 'txn_abc123',
  fromTokenAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
  slippage: 0.01, // 1% slippage tolerance
});

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Quote against a different source chain on the same chain family

The attached source locks the chain family (e.g. EVM) and the source address, but you can request quotes against any chain in that family by passing fromChainId. This avoids re-calling attachCheckoutTransactionSource just to switch between, for example, Ethereum mainnet and Base. 
import { getCheckoutTransactionQuote } from '@dynamic-labs-sdk/client';

// Source previously attached on Ethereum mainnet (chain id '1').
// Re-quote the same transaction as if paying from Base (chain id '8453').
const transaction = await getCheckoutTransactionQuote({
  transactionId: 'txn_abc123',
  fromTokenAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
  fromChainId: '8453',
});