Documentation Index
Fetch the complete documentation index at: https://circle-devdocs-test-ai-codegen-component.mintlify.app/llms.txt
Use this file to discover all available pages before exploring further.
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.
Testnet
| Blockchain | Source | Destination |
|---|
| Avalanche Fuji | ✅ | ✅ |
| Base Sepolia | ✅ | ✅ |
| Ethereum Sepolia | ✅ | ✅ |
| HyperEVM Testnet | ✅ | ✅ |
| Sei Atlantic | ✅ | ✅ |
| Sonic Testnet | ✅ | ✅ |
| World Chain Sepolia | ✅ | ✅ |
Mainnet
| Blockchain | Source | Destination |
|---|
| Arbitrum | ✅ | ✅ |
| Avalanche | ✅ | ✅ |
| Base | ✅ | ✅ |
| Ethereum | ✅ | ✅ |
| HyperEVM | ✅ | ✅ |
| OP | ✅ | ✅ |
| Polygon PoS | ✅ | ✅ |
| Sei | ✅ | ✅ |
| Sonic | ✅ | ✅ |
| Unichain | ✅ | ✅ |
| World Chain | ✅ | ✅ |
Required block confirmations
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 |
|---|
| Arbitrum | ~65 ETH blocks | ~13 to 19 minutes |
| Avalanche | 1 | ~8 seconds |
| Base | ~65 ETH blocks | ~13 to 19 minutes |
| Ethereum | ~65 | ~13 to 19 minutes |
| HyperEVM | ~1 | ~5 seconds |
| OP | ~65 ETH blocks | ~13 to 19 minutes |
| Polygon PoS | ~2-3 | ~8 seconds |
| Sei | ~1 | ~5 seconds |
| Sonic | ~1 | ~8 seconds |
| Unichain | ~65 ETH blocks | ~13 to 19 minutes |
| World Chain | ~65 ETH blocks | ~13 to 19 minutes |
