feat(arc): add USDC by default and treat native as USDC on Arc#43455
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salimtb wants to merge 11 commits into
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feat(arc): add USDC by default and treat native as USDC on Arc#43455salimtb wants to merge 11 commits into
salimtb wants to merge 11 commits into
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- Auto-import USDC for all EVM accounts on Arc when the network is present, and for newly created EVM accounts thereafter. - Hide the Arc native zero-address token everywhere it would otherwise appear as a duplicate USDC entry (token list, send asset picker, aggregated balance). - Skip rendering the pay-with row on Arc since the transaction always pays with the native token; this prevents the "no payment route" error.
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CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes. |
✨ Files requiring CODEOWNER review ✨✅ @MetaMask/confirmations (8 files, +400 -21)
👨🔧 @MetaMask/core-extension-ux (1 files, +2 -0)
💎 @MetaMask/metamask-assets (2 files, +73 -3)
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…accounts Subscribe to the NetworkController:networkAdded event at the controller layer so USDC is added the moment Arc is added — independent of whether any UI provider (AssetPollingProvider) happens to be mounted. The UI-side hook still handles backfill for accounts added later. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
| * Adds USDC on Arc for all EVM accounts that don't already have it, whenever | ||
| * the Arc network is present. Also handles new accounts added after Arc. | ||
| */ | ||
| export function useArcDefaultTokens() { |
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Nice, I don't think we need both metamask-controller changes if we have this effect :)
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Builds ready [7e4b9f0]
⚡ Performance Benchmarks (Total: 🟢 19 pass · 🟡 6 warn · 🔴 0 fail)
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Builds ready [e015356]
⚡ Performance Benchmarks (Total: 🟢 17 pass · 🟡 8 warn · 🔴 0 fail)
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bergarces
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Jun 12, 2026
| useTokenListPolling(); | ||
| useDeFiPolling(); | ||
| useStaticTokensPollingHook(); | ||
| useArcDefaultTokens(); |
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This is genius as a quick fix.
matthewwalsh0
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Jun 12, 2026
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Builds ready [451bce1]
⚡ Performance Benchmarks (Total: 🟢 17 pass · 🟡 8 warn · 🔴 0 fail)
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Builds ready [928d8db]
⚡ Performance Benchmarks (Total: 🟢 19 pass · 🟡 6 warn · 🔴 0 fail)
Bundle size diffs [🚨 Warning! Bundle size has increased!]
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Closing this one as the other one is: #43509 |
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Description
Changelog
CHANGELOG entry: add USDC by default and treat native as USDC on Arc
Related issues
Fixes:
Manual testing steps
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Pre-merge author checklist
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Note
Medium Risk
Changes span send max-amount math, aggregated balances, and MetaMask Pay token selection—user-visible fund and gas behavior on Arc, though scoped to one chain and covered by new tests.
Overview
Adds Arc-specific USDC treatment so users see one balance (the mirrored USDC ERC20) instead of duplicate native/USDC entries, with gas and pay flows aligned to the shared on-chain balance.
Default USDC on Arc: When Arc is added, the background subscribes to
NetworkController:networkAddedand callsaddCustomAssetfor Arc USDC on every EVM account;useArcDefaultTokensdoes the same from the UI polling path for accounts that do not already have the asset.ARC_USDC_TOKEN_ADDRESSis documented in shared network constants.Display and balances: Arc native assets (zero address /
isNative) are stripped in asset selectors and token balances; the token list always surfaces Arc USDC (including zero balance on Arc) outside the low-value bucket; the send asset picker omits the separate native row on Arc. Token management disables hide/import toggles for the Arc USDC identifier (bare address or full CAIP id).Send max on Arc:
sharesBalanceWithNativeGasTokenroutes Arc USDC throughgetArcMaxAmountFn, reserving ERC20-transfer gas with 18→6 decimal scaling and optionalfetchSuggestedMaxFeePerGaswhen controller estimates are missing.Pay / confirmations: Arc USDC is excluded from MetaMask Pay selectable tokens; required-tokens UI uses native vs ERC20 asset pills when the required token is the native address.
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