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+# Sentry Error Monitoring Setup
+
+This frontend now includes Sentry error monitoring to capture and report client-side errors during critical user flows (payments, wallet operations, authentication).
+
+## What's Being Monitored
+
+### Error Boundaries
+- **Global Error Boundary** (`app/global-error.tsx`): Catches unhandled application-wide errors
+- **Wallet Error Boundary** (`app/wallet/error.tsx`): Catches errors specific to wallet operations
+
+### API Errors
+All API client errors are now reported to Sentry with contextual information:
+- **Payments API** (`lib/payments-api.ts`): Payment initiation, verification, refunds
+- **Wallet API** (`lib/wallet-api.ts`): Wallet provisioning, linking, status checks
+- **Auth API** (`lib/auth-api.ts`): Login and registration
+- **Admin API** (`lib/admin-api.ts`): Ledger accounts, settlements, revenue splits
+
+Each error includes:
+- API endpoint and HTTP status code
+- Request/response context (sanitized)
+- Error boundary source (when applicable)
+- User environment information
+
+## Setup Instructions
+
+### 1. Create a Sentry Project
+1. Go to [sentry.io](https://sentry.io) and create an account
+2. Create a new project for your Next.js application
+3. Copy the DSN (Data Source Name) from your project settings
+
+### 2. Configure Environment Variables
+Add your Sentry DSN to `.env.local`:
+
+```bash
+NEXT_PUBLIC_SENTRY_DSN=https://your-dsn@sentry.io/project-id
+NEXT_PUBLIC_SENTRY_ENVIRONMENT=production  # or development, staging
+```
+
+Reference `.env.example` for all required variables.
+
+### 3. Verify Installation
+After setting the DSN, Sentry will automatically:
+- Initialize on client and server
+- Capture unhandled exceptions
+- Record session replays for errors
+- Report API failures with context
+
+## Error Context
+Errors are tagged with:
+- `errorBoundary`: Which error boundary caught the error (global/wallet)
+- `api`: Which API module failed (payments/wallet/auth/admin)
+- `endpoint`: The specific API endpoint
+- `statusCode`: HTTP status code (for API errors)
+
+## Privacy
+- Session replays mask all text and block media by default
+- Sensitive request/response data is only sent when an error occurs
+- No PII is collected unless explicitly added
+
+## Testing
+To test Sentry integration:
+1. Set a valid DSN in `.env.local`
+2. Trigger an error (e.g., by calling an API that will fail)
+3. Check your Sentry dashboard for the error report