Add rplryan/x402-discovery to Aggregators section

README.md

@@ -170,6 +170,7 @@ Servers for accessing many apps and tools through a single MCP server.
 - [ViperJuice/mcp-gateway](https://github.com/ViperJuice/mcp-gateway) 🐍 🏠 🍎 🪟 🐧 - A meta-server for minimal Claude Code tool bloat with progressive disclosure and dynamic server provisioning. Exposes 9 stable meta-tools, auto-starts Playwright and Context7, and can dynamically provision 25+ MCP servers on-demand from a curated manifest.
 - [WayStation-ai/mcp](https://github.com/waystation-ai/mcp) ☁️ 🍎 🪟 - Seamlessly and securely connect Claude Desktop and other MCP hosts to your favorite apps (Notion, Slack, Monday, Airtable, etc.). Takes less than 90 secs.
 - [wegotdocs/open-mcp](https://github.com/wegotdocs/open-mcp) 📇 🏠 🍎 🪟 🐧 - Turn a web API into an MCP server in 10 seconds and add it to the open source registry: https://open-mcp.org
+- [rplryan/x402-discovery](https://github.com/rplryan/ouroboros/tree/ouroboros/agent_economy/discovery_api) 🐍 ☁️ - Runtime discovery layer for x402-payable APIs. Agents query to find pay-per-call endpoints by capability, get quality-ranked results (uptime%, latency, health), and pay $0.005 USDC per query via x402 — the discovery itself is x402-gated. Includes Python SDK, LangChain/LlamaIndex/AutoGen/CrewAI plugins on PyPI.
 - [YangLiangwei/PersonalizationMCP](https://github.com/YangLiangwei/PersonalizationMCP) 🐍 ☁️ 🏠 🍎 🪟 🐧 - Comprehensive personal data aggregation MCP server with Steam, YouTube, Bilibili, Spotify, Reddit and other platforms integrations. Features OAuth2 authentication, automatic token management, and 90+ tools for gaming, music, video, and social platform data access.
 
 ### 🚀 <a name="aerospace-and-astrodynamics"></a>Aerospace & Astrodynamics