[NePreby]

Overview

Resolves #1 by adding full support for testnet USDC (Stellar Asset Contract) alongside native XLM for per-second micro-streams, complete with token selector, trustline pre-flight validation, and multi-token Earnings/Streams filtering.

Changes

1. Token Metadata & Registration (frontend/src/lib/config.ts):

   • Registered Circle Testnet USDC SAC (CBIELTK6YBZJU5UP2WWQEUCYKLPU6AUNZ2BQ4WWFEIE3USCIHMXQDAMA issued by GBBD47IF6LWK7P7MDEVSCWR7DPUWV3NY3DTQEVFL4NAT4AQH3ZLLFLA5) with 7 decimals.
   • Defined SUPPORTED_TOKENS with TokenInfo types for both XLM and USDC.
   • Fallback tokenMeta safely handles arbitrary unregistered SAC addresses.

2. Trustline & Horizon Balances (frontend/src/lib/wallet.ts):

   • Added hasTrustline(address, assetCode, issuer) to detect whether the recipient account can receive USDC transfers.
   • Added tokenBalance(address, tokenAddress) to query balances across both native XLM and classic credit assets on Horizon.

3. NewStreamModal Token Selector & Warning (frontend/src/components/NewStreamModal.tsx):

   • Added token selection cards for XLM and USDC with dynamic symbols, names, and check indicators.
   • Real-time recipient trustline verification: displays warning banner if recipient has not established a USDC trustline.
   • Dispatches create_stream with the chosen SAC contract ID.

4. Multi-Token Streams & Earnings Pages (frontend/src/pages/Streams.tsx, frontend/src/pages/Earnings.tsx):

   • Updated TopUpSheet to accept arbitrary token addresses and format amounts according to token metadata.
   • Removed single-token XLM lock from EarningsPage, adding All / XLM / USDC token filter tabs.

5. Unit Tests & Verification (frontend/src/lib/__tests__/tokens.test.ts):

   • 6 new unit tests verifying XLM/USDC metadata resolution, trustline detection, and token balance queries.
   • 85/85 vitest tests pass, tsc -b clean, and production Vite build succeeds.

Closes #1.

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Bounty Payout Wallet (TRC20 USDT / TRX):
TMqmJjRgVS21NL2eFtfyHciTxvE4BqGmEv