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Overview

CCTP Go SDK supports three transfer types, each optimized for different use cases based on speed and cost requirements.

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Transfer Types

Fast Transfer

~8-20 seconds with a small fee (1-14 bps)

Standard Transfer

~13-19 minutes with no fee (or ~8 seconds for instant finality chains)

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Fast Transfer

Fast Transfer provides the fastest cross-chain USDC transfers at the cost of a small fee. Key characteristics:
  • Speed: ~8-20 seconds
  • Fee: 1-14 basis points (0.01%-0.14%) depending on source chain
  • Finality threshold: 1000
  • Availability: Not available when instant finality chains are the source
params := &cctp.TransferParams{
    SourceChain:      sourceChain,
    DestChain:        destChain,
    Amount:           amount,
    RecipientAddress: recipient,
    TransferType:     cctp.TransferTypeFast, // Fast Transfer
    Testnet:          false,
}

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Standard Transfer

Standard Transfer is the default mode with no fee, suitable for cost-sensitive transfers. Key characteristics:
  • Speed: ~13-19 minutes for most chains, ~8 seconds for instant finality chains
  • Fee: No fee (0 bps)
  • Finality threshold: 2000
  • Availability: Available on all chains
params := &cctp.TransferParams{
    SourceChain:      sourceChain,
    DestChain:        destChain,
    Amount:           amount,
    RecipientAddress: recipient,
    TransferType:     cctp.TransferTypeStandard, // Standard Transfer
    Testnet:          false,
}

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Auto Mode

Auto mode automatically selects the best transfer type based on the source chain capabilities. Selection logic:
  • Instant finality chains (Avalanche, Polygon PoS, Sonic, Sei, XDC, HyperEVM) → Standard Transfer
  • Other EVM chains → Fast Transfer
params := &cctp.TransferParams{
    SourceChain:      sourceChain,
    DestChain:        destChain,
    Amount:           amount,
    RecipientAddress: recipient,
    TransferType:     cctp.TransferTypeAuto, // Auto-select
    Testnet:          false,
}

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Comparison

AspectFast TransferStandard Transfer
Speed~8-20 seconds~13-19 minutes (or ~8 seconds for instant finality)
Fee1-14 bpsNo fee
Finality Threshold10002000
AvailabilityMost chainsAll chains
Best ForTime-sensitive transfersCost-sensitive transfers

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Fee Structure

Fast Transfer fees vary by source chain: 
// Fee calculation from transfer.go:263-286
var maxFee *big.Int
if feeBps > 0 {
    // Add 1 bps buffer for fee fluctuations
    feeWithBuffer := big.NewInt(int64(feeBps + 1))
    maxFee = new(big.Int).Mul(amount, feeWithBuffer)
    maxFee = maxFee.Div(maxFee, big.NewInt(10000))
    // Ensure minimum of 1 unit
    if maxFee.Cmp(big.NewInt(0)) == 0 {
        maxFee = big.NewInt(1)
    }
} else {
    // Standard Transfer with no fee
    maxFee = big.NewInt(1)
}

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Fee Examples by Chain

  • Ethereum, Arbitrum, Base, OP Mainnet: 1 bps (0.01%)
  • Linea: 14 bps (0.14%)
  • Polygon PoS, Avalanche, Sonic: Standard Transfer only (no fee)
The SDK automatically queries the Iris API for current fee rates and includes a 1 bps safety buffer.

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Choosing the Right Type

1

Use Fast Transfer when

  • Time is critical (e.g., trading, arbitrage)
  • The fee is acceptable for your use case
  • Source chain is not an instant finality chain
2

Use Standard Transfer when

  • Cost is the priority
  • You can wait 13-19 minutes
  • Source chain has instant finality
3

Use Auto mode when

  • You want the SDK to choose optimally
  • Building a general-purpose application

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See Also

Supported Chains

View all supported chains and their capabilities

Finality

Learn about finality thresholds

Fees

Detailed fee calculation

Transfer Orchestrator

API reference for executing transfers

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