Document Arc native token handling - #286
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Arc uses USDC as both its native gas token and an enshrined ERC-20 at 0x3600000000000000000000000000000000000000. The two identities share one balance but differ in decimals (18 vs 6), so integrators that mix them misprice swaps by 10^12. Adds a section covering the two identities, the decimals footgun, the 20 gwei maxFeePerGas floor, the absence of a wrapped-native token, and wallet/indexer notes (single balance row, duplicate transfer logs, SELFDESTRUCT restrictions).
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Mantle was buried as a subsection of the representation notes and the Arc material had grown into the largest part of the page. Both now live on a Chain-Specific Native Tokens page, leaving the main guide as a single straight-through path: overview, steps, code example, ETH/WETH wrapping.
This reverts commit 8749d29.
duncancmt
approved these changes
Sep 16, 2026
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Summary
Adds an Arc section to the Handle Native Tokens guide, ahead of Arc support shipping Thursday.
On Arc, USDC is both the native gas token (18 decimals,
0xEeee…) and an enshrined ERC-20 (0x3600000000000000000000000000000000000000, 6 decimals). The two share a single balance. The Swap API returns amounts in the base units of whichever identity was requested and does no conversion, so an integrator that assumes the wrong one misprices by 10^12.Changes
#### Arc Exceptionunder Notes on Native Token Representation, pointing to the full section.## Arc: USDC as the native gas token:maxFeePerGasto at least 20 gwei.SELFDESTRUCTpatterns.Notes for reviewers
supported-chains.mdxuntouched: Arc docs currently publish only the testnet ID (5042002). Happy to add the rows once the mainnet ID is confirmed.