Add AgentServices as real-world ARD catalog example

conformance/examples/agentservices/README.md

@@ -0,0 +1,33 @@
+# AgentServices — ARD Catalog Example
+
+Real-world [Agentic Resource Discovery](https://github.com/ards-project/ard-spec) catalog from [AgentServices](https://agentservices.to), a paid API platform for AI agents.
+
+## About
+
+AgentServices provides 52 endpoints (12 free, 40 paid) covering:
+- Crypto data (prices, indicators, DeFi yields)
+- Market intelligence (portfolio analysis, market pulse, DeFi strategy)
+- On-chain analytics (whale tracking, exchange flows, stablecoin flows)
+- Cross-DEX arbitrage scanning
+- Deep research synthesis
+- AI inference (multiple LLM models)
+
+All paid endpoints use the [x402 payment protocol](https://x402.org) — agents pay per call in USDC on Base (L2).
+
+## Catalog
+
+The `ai-catalog.json` in this directory is the ARD-compatible version of the catalog served live at:
+
+```
+https://agentservices.to/.well-known/ai-catalog.json
+```
+
+It declares two entries:
+1. **MCP Server** — Remote MCP transport (SSE) at `https://agentservices.to/mcp` with 37+ tools
+2. **REST API** — HTTP endpoints with x402 nanopayments at `https://agentservices.to`
+
+## Key Features
+
+- **x402-native**: Every paid endpoint returns HTTP 402 with payment-required metadata. Agents sign EIP-3009 transfers and retry with payment headers.
+- **Multi-channel access**: REST API, MCP endpoint, SDK (Python), and plugin (ElizaOS)
+- **Agent discovery signals**: Schema.org, llms.txt, OpenAPI spec, robots.txt, x402 manifest, and ARD catalog all served from well-known paths

conformance/examples/agentservices/ai-catalog.json

@@ -0,0 +1,65 @@
+{
+  "specVersion": "1.0",
+  "host": {
+    "displayName": "AgentServices",
+    "identifier": "did:web:agentservices.to"
+  },
+  "entries": [
+    {
+      "identifier": "urn:air:agentservices.to:server:mcp",
+      "displayName": "AgentServices MCP Server",
+      "type": "application/mcp-server-card+json",
+      "url": "https://agentservices.to/mcp",
+      "capabilities": [
+        "crypto_prices",
+        "technical_indicators",
+        "defi_yields",
+        "fear_greed",
+        "portfolio_intelligence",
+        "market_pulse",
+        "defi_strategy",
+        "onchain_overview",
+        "arbitrage_scanner",
+        "deep_research",
+        "search",
+        "ai_inference"
+      ],
+      "description": "52-service paid API platform for AI agents. Data, search, market intelligence, DeFi analytics, on-chain insights, and AI inference via x402 nanopayments on Base.",
+      "representativeQueries": [
+        "what is the current price of Bitcoin and Ethereum",
+        "show me DeFi yields ranked by APY with risk assessment",
+        "analyze my crypto portfolio and give a verdict",
+        "scan for cross-DEX arbitrage opportunities",
+        "research the latest developments in AI agent infrastructure"
+      ]
+    },
+    {
+      "identifier": "urn:air:agentservices.to:api:rest",
+      "displayName": "AgentServices REST API",
+      "type": "application/x402-api+json",
+      "url": "https://agentservices.to",
+      "capabilities": [
+        "GET /v1/prices",
+        "GET /v1/indicators/{symbol}",
+        "GET /v1/yields",
+        "GET /v1/fear-greed",
+        "GET /v1/portfolio?symbol={symbol}",
+        "GET /v1/market-pulse",
+        "GET /v1/defi-strategy",
+        "GET /v1/onchain-overview",
+        "GET /v1/arbitrage",
+        "GET /v1/research?q={query}",
+        "GET /v1/search?q={query}",
+        "POST /v1/inference"
+      ],
+      "description": "REST API with x402 payment protocol. 52 endpoints (12 free, 40 paid at $0.01-$0.25/call). Agents discover, pay via USDC on Base, and consume in a single HTTP transaction.",
+      "representativeQueries": [
+        "get technical indicators for ETH",
+        "fetch the fear and greed index",
+        "get a comprehensive market overview",
+        "run deep research on a topic",
+        "generate a response using AI inference"
+      ]
+    }
+  ]
+}