Agent3 Hub

Universal AI resource registry — search and invoke agents, MCP servers, and APIs through a single MCP endpoint. Includes Telegram content search, Google search, X/Twitter search, and more.

Agent3 Hub is an open registry for AI agents, MCP servers, and APIs. It exposes every registered resource as a tool via a single MCP endpoint — connect once, invoke anything.

Endpoint: https://hub.agent3.me/api/mcp Protocol: MCP 2025-03-26 (Streamable HTTP) Get a free API key: https://hub.agent3.me/auth/signup

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Setup

Claude Desktop / any MCP client

Add to your claude_desktop_config.json:

json

{
  "mcpServers": {
    "agent3": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://hub.agent3.me/api/mcp"],
      "env": {
        "AGENT3_API_KEY": "a2a_your_key_here"
      }
    }
  }
}

Direct HTTP (curl)

bash

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "resources_search",
      "arguments": { "query": "telegram search" }
    }
  }'

Anthropic SDK (Python)

python

import anthropic

client = anthropic.Anthropic()

response = client.beta.messages.create(
    model="claude-opus-4-6",
    max_tokens=1024,
    mcp_servers=[{
        "type": "url",
        "url": "https://hub.agent3.me/api/mcp",
        "headers": {"Authorization": "Bearer a2a_your_key_here"}
    }],
    messages=[{"role": "user", "content": "Search Telegram for 'AI agents 2026'"}]
)

---

Available Tools

Tool	Description	Auth
resources_search	Search the registry by keyword or semantic query	Required
resources_invoke	Invoke any registered resource by ID + operation	Required
resources_get	Get full details of a resource by ID	Required
resources_resolve	Resolve a resource endpoint URL	Required
resources_stats	Get usage stats for a resource	Required
agents_search	Text search across registered agents	Required
agents_semantic_search	Semantic/vector search across agents	Required
agents_get	Get agent details by ID	Required
agents_invoke	Invoke an A2A agent directly	Required
agents_register	Register a new agent in the hub	Required
tools/list	List all available tools	Public
resources/list	List all resources	Public
initialize	Server info and capabilities	Public

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Example: Search Telegram Content

bash

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "resources_invoke",
      "arguments": {
        "resourceId": "a23cc5a9-0bfb-4466-acbe-fbc9af723ba4",
        "operationId": "search-content",
        "input": { "query": "AI news" }
      }
    }
  }'

Example: Search Google

bash

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 2,
    "method": "tools/call",
    "params": {
      "name": "resources_invoke",
      "arguments": {
        "resourceId": "a5a14786-6738-47e2-a8e7-982ca4a90735",
        "operationId": "search",
        "input": { "query": "MCP protocol 2026" }
      }
    }
  }'

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Rate Limits (Free Tier)

Category	Daily Limit
Telegram search	20 calls/day
Google search	20 calls/day
X/Twitter search	20 calls/day
Registry search & get	Unlimited

Limits reset at midnight UTC. Upgrade available at hub.agent3.me.

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Resource Types

Type	Description
agent	A2A protocol AI agents
api	REST / GraphQL / MCP web services
sdk	Software development kits
data	Data services and feeds

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Links

• Registry: https://hub.agent3.me
• Docs: https://hub.agent3.me/docs
• Get API key: https://hub.agent3.me/auth/signup
• MCP endpoint: https://hub.agent3.me/api/mcp