A Model Context Protocol (MCP) server built on JSON-RPC 2.0 with 8 powerful open-source tools — no API keys required for most tools.

https://bnsalmhythm730--47d38190354611f193b642b51c65c3df.web.val.run

• Protocol: JSON-RPC 2.0
• MCP Version: 2024-11-05
• Transport: HTTP (POST /rpc or POST /)
• CORS: Fully open (*)

POST /rpc
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {},
    "clientInfo": { "name": "MyClient", "version": "1.0" }
  }
}

{ "jsonrpc": "2.0", "id": 2, "method": "tools/list", "params": {} }

{
  "jsonrpc": "2.0", "id": 3,
  "method": "tools/call",
  "params": { "name": "web_search", "arguments": { "query": "latest AI news", "max_results": 5 } }
}

{
  "jsonrpc": "2.0", "id": 4,
  "method": "tools/call",
  "params": { "name": "calculator", "arguments": { "expression": "sqrt(144) + factorial(7) + sin(pi/2)" } }
}

{
  "jsonrpc": "2.0", "id": 5,
  "method": "tools/call",
  "params": { "name": "currency_converter", "arguments": { "amount": 100, "from": "USD", "to": "EUR,GBP,JPY" } }
}

{
  "jsonrpc": "2.0", "id": 6,
  "method": "tools/call",
  "params": { "name": "weather", "arguments": { "location": "Tokyo", "include_forecast": true } }
}

{
  "jsonrpc": "2.0", "id": 7,
  "method": "tools/call",
  "params": { "name": "time_and_date", "arguments": { "action": "world_clocks" } }
}

{
  "jsonrpc": "2.0", "id": 8,
  "method": "tools/call",
  "params": { "name": "unit_converter", "arguments": { "value": 100, "from": "celsius", "to": "fahrenheit" } }
}

{
  "jsonrpc": "2.0", "id": 9,
  "method": "tools/call",
  "params": { "name": "fetch_url", "arguments": { "url": "https://api.github.com", "extract_text": false } }
}

main.ts (HTTP handler + JSON-RPC dispatcher)
└── tools/
    ├── index.ts       (tool registry + dispatcher)
    ├── search.ts      (DuckDuckGo)
    ├── calculator.ts  (safe math eval)
    ├── sysinfo.ts     (Deno runtime info)
    ├── currency.ts    (frankfurter.app)
    ├── datetime.ts    (world clocks, diff)
    ├── fetchurl.ts    (HTTP fetch + HTML strip)
    ├── weather.ts     (Open-Meteo)
    └── units.ts       (7 unit categories)

• ✅ Strict JSON-RPC 2.0 (always includes jsonrpc: "2.0" and id)
• ✅ Batch request support
• ✅ Full CORS support
• ✅ MCP initialize / tools/list / tools/call methods
• ✅ No API keys required (all free data sources)
• ✅ 15s timeout on external requests
• ✅ Detailed error responses with proper error codes