Supported Networks
The facilitator at https://x402.dexter.cash handles verification and settlement across Solana and seven EVM chains. Use this table as the human-readable reference. For the live machine-facing contract, query GET /supported.
Network Matrix
| Network | CAIP-2 Identifier | Type | Status |
|---|---|---|---|
| Solana Mainnet | solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp | SVM | Production |
| Solana Devnet | solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1 | SVM | Testnet |
| Base Mainnet | eip155:8453 | EVM | Production |
| Base Sepolia | eip155:84532 | EVM | Testnet |
| Polygon | eip155:137 | EVM | Production |
| Arbitrum | eip155:42161 | EVM | Production |
| Optimism | eip155:10 | EVM | Production |
| Avalanche | eip155:43114 | EVM | Production |
| BNB Smart Chain | eip155:56 | EVM | Production |
| SKALE Base | eip155:1187947933 | EVM | Production |
| SKALE Base Sepolia | eip155:324705682 | EVM | Testnet |
Legacy v1 aliases (solana, base, polygon, etc.) still work for backward compatibility. Prefer CAIP-2 identifiers in new integrations.
Chain Notes
Solana is the primary payment path with full fee sponsorship. Most x402 traffic settles here. See the Solana chain page for SVM-specific details.
Base is the default EVM starting point. Lowest EVM fees, strongest Dexter integration coverage. See the Base chain page.
Polygon, Arbitrum, Optimism, Avalanche all follow the same EVM settlement path. The facilitator validates the transfer, confirms the recipient and amount match the payment requirements, and settles. No chain-specific configuration is needed beyond specifying the correct CAIP-2 identifier. All EVM chains also support Permit2 (assetTransferMethod: "permit2" in /supported), enabling payments with any ERC-20 token and approval relay via the erc20ApprovalGasSponsoring extension.
BNB Smart Chain (BSC) stablecoins lack EIP-3009, so BSC settles exclusively through Permit2. The payer pays a one-time Permit2 approval (~$0.001 BNB), after which all BSC payments are gasless. Both BSC stablecoins (USDT and USDC) use 18 decimals, not 6. See the BSC chain page for details.
SKALE Base is a zero-gas EVM chain, which makes it interesting for high-frequency low-value payments. See the SKALE chain page for positioning and partner guidance.
What the Facilitator Provides on Every Chain
- Verification of x402 payment payloads against requirements
- Settlement fee sponsorship — the facilitator pays settlement transaction fees on every supported chain (fee payer on Solana, gas on EVM; free on SKALE)
- On-chain settlement orchestration
- Extension support (bazaar discovery, sponsored access)
- Stable public endpoint at
https://x402.dexter.cash
Validating Chain Support
This returns the live list of supported network identifiers. Cross-reference with this table to confirm coverage.