feat: add arbitrum and arbitrum-sepolia to NetworkSchema#180
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Description
Adds
arbitrum(chain ID 42161) andarbitrum-sepolia(chain ID 421614) to the TypeScriptNetworkSchemaenum,SupportedEVMNetworksarray, andEvmNetworkToChainIdmap intypescript/packages/legacy/x402/src/types/shared/network.ts.Why Arbitrum: Second-largest EVM chain by TVL. Circle issues native USDC on Arbitrum One (
0xaf88d065e77c8cC2239327C5EDb3A432268e5831) with full EIP-3009 (transferWithAuthorization) support — the same transfer method used by Base and Polygon. No Permit2 fallback needed.What was already in the repo (this PR completes the picture):
typescript/packages/mechanisms/evm/src/shared/defaultAssets.ts—eip155:42161andeip155:421614already defined ✅go/mechanisms/evm/constants.go—ChainIDArbOneandChainIDArbSepoliaalready defined ✅This PR adds the missing network shortname entries so that clients and servers can reference
"arbitrum"by name, consistent with how"polygon","avalanche", and other chains are registered.Tests
Verified end-to-end against a live x402 infrastructure with real USDC settlement on Arbitrum One using the native
0xaf88d065e77c8cC2239327C5EDb3A432268e5831token contract. EIP-3009transferWithAuthorizationsignatures produce valid on-chain USDC transfers on Arbitrum One, confirming the chain is fully compatible with the existing exact-evm scheme.The TypeScript change is additive only (new enum values, no logic changes), so existing tests for other networks are unaffected.
Checklist