Base

Default EVM

Base

Base is the default EVM chain in Dexter. Lowest EVM fees, native Circle USDC, smart wallet support, and the only EVM chain with Solana↔Base cross-chain bridge.

Cross-chain bridge

Network IDs

Why Base Is the Default EVM

• Native Circle USDC — standard USDC, same contract as everywhere else on Base
• Gas sponsored — the facilitator pays gas on every Base transaction
• Smart wallets — ERC-4337 smart wallet deployment and verification supported
• Cross-chain bridge — Solana↔Base settlement via the bridge scheme
• Lowest EVM fees — Base L2 fees are consistently the cheapest among supported EVM chains

Token Details

Settlement Model

On Base, the default settlement path uses EIP-3009 transferWithAuthorization. The facilitator validates the payload against payment requirements before settlement:

• Recipient must match payTo
• Token must match the required asset
• Amount must be at least the required value
• Timing — validBefore must be future, validAfter must be past

The facilitator submits the transaction and pays gas. Buyers only need USDC.

Permit2 is also available on Base. The facilitator signals assetTransferMethod: "permit2" in the /supported response, enabling payments with any ERC-20 token. The one-time Permit2 approval costs the payer a small amount of ETH (~$0.001). After that, every Permit2 payment is gasless. The facilitator can relay the approval via the erc20ApprovalGasSponsoring extension.

Best Fit

• merchants who want EVM first
• teams already building on Base
• cross-chain use cases where buyers and sellers are on different chains (Solana↔Base)
• integrations that want smart wallet support on EVM

Quick Support Check

curl -s https://x402.dexter.cash/supported | jq '.kinds[] | select(.network == "eip155:8453")'

Validate Before Shipping

1. Confirm you are using the correct Base CAIP-2 identifier (eip155:8453 or eip155:84532 for testnet).
2. Confirm the payment asset is USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).
3. Test POST /verify and POST /settle with a real Base-targeted payment.
4. If using cross-chain bridge, test the bridge quote and settlement flow separately.

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