Key Concepts

What are Intents?

An intent describes what the user wants to do. For example, sending USDC from one chain to another. It includes things like:

• The source and destination chains.

• How much to send.

• Who is sending and receiving.

The SDK takes this intent and finds the best way to make it happen.

What is Automatic Cross-Chain Relaying?

Automatic Cross-Chain Relaying allows transfers to be completed with just a signature from the source chain wallet. No manual transactions, no wallet switching, and no interaction with the destination chain.

The SDK handles everything behind the scenes:

1. User signs a permit message (no onchain approval needed).

2. SDK submits a gasless transfer to the Stableit relayer.

3. The relayer waits for Circle’s attestation.

4. Once confirmed, the relayer completes the transfer on the destination chain.

5. Any required intermediate hops (e.g. via Avalanche) are handled automatically.

This means you just sign a message and you’re done.

Without relaying, you’d need to:

• Connect to the source chain

• Send a transfer transaction and pay gas

• Switch to the destination chain

• Sign a receive transaction and pay more gas

With relaying, the entire experience is seamless.

What are Gasless Transfers?

Gasless transfers allow users to pay transaction fees using USDC instead of native tokens like ETH, MATIC, or AVAX.

With this feature enabled:

• Users don’t need to hold any native gas tokens on the source or destination chain.

• The SDK handles all gas fees under the hood using USDC.

• Transfers become more accessible, especially for new wallets or non-technical users.

This results in a seamless experience where users only need USDC to initiate and complete a transfer. No gas, no chain switching, no friction.

What is Gas Drop-off on Destination?

Gas drop-off allows you to include a small amount of the destination chain’s native gas token (e.g., ETH, MATIC, AVAX) when sending USDC. This ensures the recipient wallet has enough gas to cover transaction fees on the destination chain.

What is CCTPv2?

CCTPv2 is Circle’s protocol that lets you move USDC between blockchains by burning it on the source chain and minting it on the destination chain, all with instant finality on supported networks like Ethereum, Avalanche, and Base.

What is CCTPr?

CCTPr is Stableit’s smart routing system built on top of Circle’s CCTP. Whether you're going between V2 chains, V1-only chains, or a mix, CCTPr handles advanced features for you like:

• Gas drop-off (receive native gas on the target chain).

• Cross-version routing via Avalanche.

• Off-chain relaying with fast delivery.

By utilizing Avalanche’s fast-finality network as a routing hub, we dramatically reduce wait times for transfers between V2 and V1 chains, making them nearly as fast as direct V2 transfers.

What is Avax Router?

A compatibility layer developed by Stableit to enable transfers to V1-only chains by using Avalanche as a fast-finality intermediate hop. It bridges the gap between V2 and V1 corridors where direct V2 routes aren’t yet available.