Gateway support is divided into two categories:
- Source Chains where USDC can be deposited to the Gateway Wallet smart contract to create a unified balance.
- Destination Chains where USDC can be instantly minted from the unified balance.
The following sections show the chains that Gateway supports and their status as a source or destination chain.
| Blockchain | Source | Destination |
|---|---|---|
| Avalanche Fuji | ✅ | ✅ |
| Base Sepolia | ✅ | ✅ |
| Ethereum Sepolia | ✅ | ✅ |
Before updating the unified USDC balance or issuing attestations, the Gateway API waits for a specific number of block confirmations so that the deposit transaction is unlikely to be reverted.
The following table shows the number of block confirmations and the average time to attestation for each supported chain. The average time to attestation is the time it takes for a transaction to be included in a block and confirmed by the network.
| Blockchain | Number of blocks | Average time |
|---|---|---|
| Avalanche | 1 | ~8 seconds |
| Base | ~65 ETH blocks | ~13 to 19 minutes |
| Ethereum | ~65 | ~13 to 19 minutes |
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