---
taskmaster_id: "8"
status: "pending"
priority: "high"
depends_on: []
parent_id: ""
source: "taskmaster"
generated_at: "2026-05-28T11:49:27.076Z"
---

# 8 - Multichain RN proxy registry + USDC/USDT support

- [ ] 8 - Multichain RN proxy registry + USDC/USDT support #taskmaster #priority/high #status/pending ⏫ 🆔 tm-8

## Metadata

| Field | Value |
| --- | --- |
| Taskmaster ID | 8 |
| Status | pending |
| Priority | high |
| Dependencies | None |
| Parent | None |

## Description

Probe and persist RN ERC20FeeProxy addresses on BSC/Arb/ETH/Polygon/Base, add USDC + USDT token entries with correct decimals per chain, and surface an admin networks page. Include the USDT-mainnet approve(0) reset quirk in the frontend approve step.

## Details

See PRD - Wallet, Multichain, Confirmations, AML, Trezor.md §2. Tasks: new backend/scripts/probe-rn-chains.ts that walks each chain in supported-chains.json and verifies the canonical 0x0DfbEe143b42B41eFC5A6F87bFD1fFC78c2f0aC9 proxy is the real RN proxy via a known view fn (CREATE2 is deterministic, but verify); promote backend/src/services/payment/requestNetwork/tokens.ts to load from JSON + admin override; add USDT entries on all 5 chains (BSC USDT 18-dec quirk, mainnet/Arb/Polygon/Base USDT 6-dec); buildInHouseCheckoutBlock returns reason='unsupported_chain:<id>' for unknowns; new admin route GET /api/admin/rn/networks + frontend page /dashboard/admin/networks rendering the registry with per-row 'probe again'. Frontend approve flow: if buyer is on Ethereum mainnet AND token is USDT AND current allowance > 0, do approve(spender, 0) first then approve(spender, amount). Acceptance: probe succeeds on at least BSC/Arb/Polygon/ETH/Base; one paid probe on BSC USDT end-to-end; mainnet USDT approve(0) reset works; admin page reflects registry. Dependencies: none — runs in parallel with #9. This is task #8 in the PRD.

## Verification

_No verification strategy._