Add comprehensive Rentcast API documentation and pricing info

- Add official Rentcast API links (documentation, pricing, dashboard)
- Add pricing section explaining why caching saves money (70-90% cost reduction)
- Include Rentcast's description: 140+ million property records
- Add navigation links in header (API Home, Documentation, Repository)
- Enhance support section with Rentcast resources
- Clarify cost implications and cache benefits

README.md

@@ -5,10 +5,18 @@
   
   <h3>MCP Server for Rentcast API</h3>
   <p>Intelligent property data access with advanced caching, rate limiting, and cost management</p>
+  
+  <p>
+    <a href="https://www.rentcast.io/api">API Home</a> •
+    <a href="https://developers.rentcast.io/reference/introduction">Documentation</a> •
+    <a href="https://git.supported.systems/MCP/mcrentcast">Repository</a>
+  </p>
 </div>
 
 ---
 
+> **The Rentcast real estate and property data API provides on-demand access to 140+ million property records, owner details, home value and rent estimates, comparable properties, active sale and rental listings, as well as aggregate real estate market data.**
+
 A Model Context Protocol (MCP) server that provides intelligent access to the Rentcast API with advanced caching, rate limiting, and cost management features.
 
 ## 🌟 Features
@@ -493,12 +501,24 @@ The server provides complete access to Rentcast API endpoints:
 | **Market Data** | Statistics and trends | `get_market_statistics` |
 | **Management** | Configuration and monitoring | 6 management tools |
 
-### Cost Management
+### 💰 API Pricing & Cost Management
 
+#### Rentcast API Pricing
+Rentcast offers several pricing tiers for API access. See [official pricing](https://www.rentcast.io/api#api-pricing) for current rates:
+- **Free Tier**: Limited requests for testing
+- **Basic**: $99/month for 1,000 requests
+- **Professional**: Higher volumes with bulk pricing
+- **Enterprise**: Custom pricing for large-scale usage
+
+> **Why We Cache**: Each API request costs money! Our [intelligent caching system](#-features) stores responses for 24 hours (configurable), dramatically reducing costs by serving repeated requests from cache instead of making new API calls. This can reduce API costs by 70-90% in typical usage patterns.
+
+#### Cost Management Features
 - **Automatic Cost Estimation**: Know before you spend
 - **User Confirmations**: Approve expensive operations
 - **Usage Tracking**: Monitor daily/monthly consumption
 - **Smart Caching**: Minimize redundant API calls
+- **Rate Limiting**: Prevent accidental overuse
+- **Cache Analytics**: Track hit rates and savings
 - **Mock API**: Unlimited testing without credits
 
 ## 📄 License
@@ -522,12 +542,18 @@ Contributions are welcome! Please:
 
 ## 📞 Support
 
-### Documentation Resources
+### Project Documentation
 - **[Installation Guide](docs/INSTALLATION.md)**: Complete setup instructions
 - **[Usage Examples](docs/USAGE.md)**: All 13 tools with real-world examples  
 - **[Mock API Testing](docs/mock-api.md)**: Test without consuming credits
 - **[Claude Integration](docs/claude-setup.md)**: MCP configuration help
 
+### Rentcast API Resources
+- **[API Documentation](https://developers.rentcast.io/reference/introduction)**: Official API reference
+- **[API Pricing](https://www.rentcast.io/api#api-pricing)**: Current pricing tiers
+- **[API Dashboard](https://app.rentcast.io)**: Manage your API keys
+- **[Rentcast Support](https://www.rentcast.io/contact)**: Official support channel
+
 ### Getting Help
 - **Issues**: [Create an issue](https://git.supported.systems/MCP/mcrentcast/issues) on the repository
 - **Discussions**: Use GitHub discussions for questions and community support