feat(evm): add XDC Network (50) and XDC Apothem testnet (51) default assets#217
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feat(evm): add XDC Network (50) and XDC Apothem testnet (51) default assets#217AnilChinchawale wants to merge 1 commit into
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…assets
Registers XDC Network mainnet and Apothem testnet in the EVM default-asset
registries (TypeScript, Go, Python) so USD-string pricing ("$0.01") resolves
to native USDC on XDC.
XDC has native Circle USDC (not bridged) with EIP-3009
transferWithAuthorization, so the default exact scheme works without Permit2.
EIP-712 domain values were read on-chain:
- mainnet (eip155:50): 0xfA2958CB79b0491CC627c1557F441eF849Ca8eb1,
name "USDC", version "2", 6 decimals
- apothem (eip155:51): 0xb5AB69F7bBada22B28e79C8FFAECe55eF1c771D4,
name "USDC", version "2", 6 decimals
Note: the EIP-712 domain name is "USDC" (not "USD Coin").
Native USDC + CCTP V2 launched on XDC in Aug 2025.
🟡 Heimdall Review Status
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Summary
Adds XDC Network mainnet (
eip155:50) and XDC Apothem testnet (eip155:51) to the EVM default-asset registries, followingDEFAULT_ASSETS.md. This lets USD-string pricing (price: "$0.10") resolve to native USDC on XDC out of the box, across all three SDKs.Changes
Per the cross-SDK checklist in
DEFAULT_ASSETS.md, same CAIP-2 key / address / EIP-712name+version/ decimals in each:typescript/packages/mechanisms/evm/src/shared/defaultAssets.tsDEFAULT_STABLECOINSgo/mechanisms/evm/constants.goNetworkConfigs(+ChainIDXDC/ChainIDXDCApothemvars)python/x402/mechanisms/evm/constants.pyNETWORK_CONFIGSAsset selection & on-chain-verified values
XDC's default asset is native Circle USDC — Circle launched native USDC + CCTP V2 on XDC Network in August 2025 (native issuance, not a bridge wrapper). Native USDC implements EIP-3009
transferWithAuthorization, so the defaultexactscheme works with no Permit2 fallback required.The EIP-712 domain values below were read directly from the token contracts on-chain (not from docs), since
DEFAULT_ASSETS.mdrequiresname/versionto match the domain separator exactly:eip155:50)eip155:51)0xfA2958CB79b0491CC627c1557F441eF849Ca8eb10xb5AB69F7bBada22B28e79C8FFAECe55eF1c771D4name()USDCUSDCversion()22decimals()66authorizationState()Validation
go build ./mechanisms/evm/andgo vet ./mechanisms/evm/pass;gofmtclean.python -m py_compileonconstants.pypasses.DEFAULT_STABLECOINSshape exactly.eth_call/eth_getCodeagainst XDC mainnet (https://rpc.xdc.org) and Apothem (https://rpc.apothem.network).Ecosystem note
XDC mainnet already has the canonical Permit2 (
0x0000…78BA3) and the x402 exact-permit2 proxy (0x402085…0001) deployed, so both the EIP-3009 and Permit2 paths are viable there. (Multicall3 is not yet deployed on XDC; flagging in case facilitator batch-verification relies on it.)This follows
DEFAULT_ASSETS.mdexactly (the three registry files). Happy to add a changeset or touch the legacy/e2e network tables if maintainers would like parity there.