feat(assets-controllers): enable token detection for DeFi Oracle Meta (138)

[defiQUG]

Summary

Add DeFi Oracle Meta Mainnet (chain 138 / 0x8a) to MetaMask token detection allowlists so mobile and extension users can use Autodetect tokens on Chain 138.

Mirrors recent network additions such as ARC (#9006) and HyperEVM (#7790): enum entry + Accounts API v4 list. Does not replace hosted Tokens API registration (token.api.cx.metamask.io).

Chain metadata is already on Chainlist: https://github.com/ethereum-lists/chains/blob/master/_data/chains/eip155-138.json

Changes

1. packages/assets-controllers/src/assetsUtil.ts

Add to SupportedTokenDetectionNetworks:

DefiOracleMeta = '0x8a', // decimal: 138 — DeFi Oracle Meta Mainnet

2. packages/assets-controllers/src/constants.ts

Add to SUPPORTED_NETWORKS_ACCOUNTS_API_V4:

'0x8a', // 138 DeFi Oracle Meta Mainnet

3. packages/assets-controllers/src/assetsUtil.test.ts

it('returns true for DeFi Oracle Meta Mainnet (138)', () => {
  expect(
    assetsUtil.isTokenDetectionSupportedForNetwork('0x8a'),
  ).toBe(true);
});

Not in scope for v1: SINGLE_CALL_BALANCES_ADDRESS_BY_CHAINID — modern chains (e.g. Monad) rely on Accounts API v4; ARC/HyperEVM PRs did not require a balance-checker deploy.

Token list (for MetaMask Tokens API ops)

URL	Role
https://tokens.d-bis.org/lists/dbis-138.tokenlist.json	Pinned Uniswap-schema list
https://explorer.d-bis.org/token-aggregation/api/v1/report/token-list?chainId=138&wallet=1	Wallet-eligible subset
https://explorer.d-bis.org/token-aggregation/api/v1/config/metamask?chainId=138	EIP-747 + tokenDetection metadata

Why

• Chain 138 is a live EVM mainnet (public RPC https://rpc-http-pub.d-bis.org, explorer https://explorer.d-bis.org).
• Mobile currently shows: “Token detection is not available on this network yet.”
• DBIS operates explorer-side detection (Blockscout index + EIP-747) until upstream gates clear; native autodetect requires this client allowlist and Tokens API ingestion.

Relationship to other DBIS PRs

• #9118 — Price API / native ETH spot fallback only; does not enable token detection.
• Tokens API email (separate Consensys track) — register eip155:138 on token.api.cx.metamask.io.

Test plan

• yarn test packages/assets-controllers/src/assetsUtil.test.ts
• isTokenDetectionSupportedForNetwork('0x8a') → true
• isTokenListSupportedForNetwork('0x8a') → true
• SUPPORTED_NETWORKS_ACCOUNTS_API_V4 includes '0x8a'

References

• Chainlist: eip155-138.json
• Pattern: MetaMask/core feat: add ARC mainnet account/asset detection #9006 (ARC), feat: add hyperevm assets detection/account #7790 (HyperEVM), feat: add Monad Mainnet support to @metamask/assets-controllers #6618 (Monad)
• Explorer wallet: https://explorer.d-bis.org/wallet

Made with Cursor

[defiQUG]

Operator note (2026-06-28): Companion to MetaMask/core #9118 (Price API client fallback).

• Tokens API registration email sent to support@codefi-data.zendesk.com (2026-06-28).
• Chainlist merged: eip155-138.json
• Operator token lists live: https://tokens.d-bis.org/lists/dbis-138.tokenlist.json

Hosted token.api.cx.metamask.io ingestion is a separate Consensys track; this PR enables the client-side allowlist gate only.