CCTP fees

• Fee range: 0-13 basis points depending on source blockchain, for example $0–$1.30 per $1,000 transferred
• When and how the fee is collected: The fee is deducted from the transferred amount when USDC is minted on the destination blockchain

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Get the current fee

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Maximum fee parameter

await tokenMessenger.depositForBurn(
  amount,
  destinationDomain,
  mintRecipient,
  burnToken,
  destinationCaller,
  500n, // maxFee: 500 subunits (0.0005 USDC)
  1000, // minFinalityThreshold: Fast Transfer
);

1. Retrieve the current fee before initiating a transfer
2. Add a small buffer (for example, 10-20%) to account for potential fee fluctuations
3. Set maxFee to this buffered amount

async function calculateMaxFee(
  sourceDomain: number,
  destDomain: number,
  transferAmountUSDC: string, // USDC amount like "1" or "10.5"
) {
  // Convert USDC to subunits (6 decimals)
  const [whole, decimal = ""] = transferAmountUSDC.split(".");
  const decimal6 = (decimal + "000000").slice(0, 6);
  const transferAmount = BigInt(whole + decimal6);

  // Get current fee
  const response = await fetch(
    `https://iris-api-sandbox.circle.com/v2/burn/USDC/fees/${sourceDomain}/${destDomain}`,
  );
  const fees = await response.json();

  // Extract minimumFee for Fast Transfer (finalityThreshold 1000)
  const minimumFee = fees[0].minimumFee; // Fee in basis points

  // Calculate fee as percentage of transfer amount
  const protocolFee =
    (transferAmount * BigInt(Math.round(minimumFee * 100))) / 1_000_000n;

  // Add 20% buffer to protocol fee (protocolFee × 1.2) - result in subunits
  const maxFee = (protocolFee * 120n) / 100n;

  return maxFee; // denominated in USDC subunits (6 decimals)
}

// Use in your burn call
const maxFee = await calculateMaxFee(0, 1, "10.5");

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Fee tables

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Standard Transfer fee switch

• Some deployments of the TokenMessengerV2 contract include a fee switch that enforces a minimum onchain fee. This fee is collected during USDC minting in a Standard Transfer. See tables below for supported blockchains.
• TokenMessengerV2 contracts with fee switch support include the getMinFeeAmount function, which calculates and returns the minimum fee required for a given burn amount, in units of the burnToken.

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TokenMessenger contracts without fee switch support

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TokenMessenger contracts with fee switch support

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Fee optimization strategies

• Choose the right method: Use Fast Transfer when speed is critical and Standard Transfer when cost optimization is the priority.
• Monitor allowance: For high-volume applications, monitor the Fast Transfer allowance and switch to Standard Transfer when it’s low.
• Batch transfers: If you’re making multiple transfers, consider batching them during periods when Fast Transfer allowance is high.
• Set appropriate maxFee: Always retrieve the current fee before initiating a transfer and set maxFee with a buffer to account for minor fluctuations.

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Charging your own application fee