Closes #166 Anchor selection dropdown

[limitlxx]

Closes #166

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Anchor Selection Dropdown - Quick Start Guide

Issue #166 Implementation

This guide will help you get the anchor selection feature up and running.

What Was Implemented

✅ Backend API for anchor provider data
✅ Frontend React component with dropdown UI
✅ Fee structure display
✅ Transaction limits display
✅ Compliance requirements display
✅ Filtering by currency and status
✅ Unit tests for both backend and frontend

File Structure

api/
├── src/
│   ├── routes/
│   │   └── anchors.ts          # Anchor API endpoints
│   ├── types/
│   │   └── anchor.ts           # TypeScript interfaces
│   ├── __tests__/
│   │   └── anchors.test.ts     # API tests
│   └── app.ts                  # Updated with anchors route

frontend/
├── src/
│   └── components/
│       ├── AnchorSelector.tsx  # Main component
│       ├── AnchorSelector.css  # Styling
│       └── __tests__/
│           └── AnchorSelector.test.tsx  # Component tests

Quick Start

1. Start the Backend API

cd api
npm install
npm run dev

The API will be available at http://localhost:3000

2. Test the API

# Get all anchors
curl http://localhost:3000/api/anchors

# Get anchors for USD
curl http://localhost:3000/api/anchors?currency=USD

# Get specific anchor
curl http://localhost:3000/api/anchors/anchor-1

3. Use the Frontend Component

import { AnchorSelector } from './components/AnchorSelector';

function RemittanceForm() {
  const handleAnchorSelect = (anchor) => {
    console.log('Selected anchor:', anchor);
    // Use anchor data for your remittance
  };

  return (
    <AnchorSelector
      onSelect={handleAnchorSelect}
      currency="USD"
      apiUrl="http://localhost:3000"
    />
  );
}

Features

Dropdown Selection

• Click to open dropdown
• View all available anchors
• See ratings and verification status
• Quick view of fees, limits, and processing time

Detailed View

• Click "Show Details" to expand
• Complete fee structure
• All transaction limits
• Full compliance requirements
• Supported countries and restrictions

Data Displayed

Fees:

• Deposit fee (% + fixed)
• Withdrawal fee (% + fixed)
• Min/max fee caps

Limits:

• Per transaction (min/max)
• Daily limits
• Monthly limits

Compliance:

• KYC level (Basic/Standard/Enhanced)
• Required documents
• Supported countries
• Restricted countries

Mock Data

Currently includes 3 anchor providers:

1. MoneyGram Access - Global coverage, intermediate KYC
2. Circle USDC - Instant settlement, enhanced KYC
3. AnchorUSD - Americas focus, basic KYC

Next Steps

For Production

1. Database Integration

   • Replace mock data with database queries
   • Add anchor CRUD operations
   • Implement caching

2. Authentication

   • Add API authentication
   • Implement rate limiting per user
   • Add admin endpoints

3. Real-time Updates

   • WebSocket for status changes
   • Live fee updates
   • Availability notifications

4. Smart Contract Integration

   • Store anchor verification on-chain
   • Integrate with remittance contract
   • Add settlement tracking

Testing

# Backend tests
cd api
npm test

# Frontend tests
cd frontend
npm test

API Documentation

Full API documentation is available in api/README.md

Component Props

interface AnchorSelectorProps {
  onSelect: (anchor: AnchorProvider) => void;
  selectedAnchorId?: string;
  currency?: string;
  apiUrl?: string;
}

Styling

The component uses CSS modules. Customize by editing:

• frontend/src/components/AnchorSelector.css

Support

For issues or questions, refer to:

• ANCHOR_SELECTION.md - Full implementation details
• api/README.md - API documentation
• Component source code with inline comments