Supported Networks
Paratro’s Facilitator supports settlement across multiple EVM chains and Solana. All networks support USDC as the primary settlement token.
EVM Chains
| Chain | Network | Chain ID | USDC Contract | Status |
|---|
| Ethereum | Mainnet | 1 | 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 | Active |
| Ethereum | Sepolia | 11155111 | 0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238 | Active |
| Base | Mainnet | 8453 | 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 | Active |
| Base | Sepolia | 84532 | 0x036CbD53842c5426634e7929541eC2318f3dCF7e | Active |
| Polygon | Mainnet | 137 | 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359 | Active |
Solana
| Network | USDC Mint | Status |
|---|
| Mainnet | EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v | Active |
| Devnet | 4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU | Active |
Transfer Methods
Each chain supports one or more transfer methods for settlement:
| Method | Token Support | Supported Schemes | Description |
|---|
| ERC-3009 | USDC only | exact | Native transferWithAuthorization — gasless for the payer, no prior approval needed |
| Permit2 | Any ERC-20 | exact, upto | Universal token permits via Uniswap’s Permit2 contract |
| SPL Token | USDC (SPL) | exact | Solana-native TransferChecked instruction |
Proxy Contracts (EVM)
These proxy contracts are deployed via CREATE2 and have the same address on all supported EVM chains:
| Contract | Address | Purpose |
|---|
| x402ExactPermit2Proxy | 0x402085c248EeA27D92E8b30b2C58ed07f9E20001 | Exact-amount Permit2 settlement |
| x402UptoPermit2Proxy | 0x4020a4f3b7b90CCA423b9FabCC0CE57c6c240002 | Flexible-amount Permit2 settlement |
| Permit2 (Uniswap) | 0x000000000022D473030F116dDEE9F6B43aC78BA3 | Universal token permit registry |
The x402UptoPermit2Proxy (upto scheme) is currently available on Base Mainnet and Base Sepolia only. Other chains use exact scheme exclusively.
Network Identifiers
When constructing x402 payment requests, use the appropriate identifier for your protocol version:
| Version | Format | Example (Base Sepolia) |
|---|
| V1 | Human-readable string | base-sepolia |
| V2 | Chain ID (numeric) | 84532 |
V1 Network Strings
| Chain | Mainnet | Testnet |
|---|
| Ethereum | ethereum | ethereum-sepolia |
| Base | base | base-sepolia |
| Polygon | polygon | — |
| Solana | solana | solana-devnet |
Requesting New Networks
Need support for an additional chain? Contact us at support@paratro.com or reach out through the Dashboard. We evaluate new chain support based on USDC availability, RPC reliability, and merchant demand.
