# SignalDesk AI MCP Search

> SignalDesk AI MCP Search is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-13).

Searches the Model Context Protocol (MCP) server registry by keyword and returns matching MCP server listings with connection details

## Facts

- Endpoint: GET https://x402-agent.kariguetoazul.workers.dev/api/discovery/mcp-search?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-mcp-search-8c714936
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ioOoMY0NQm7WV9LcYQcBy

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signaldesk-ai-mcp-search-8c714936
```

Example prompt: Search the MCP registry for servers related to 'database' and show me the top 5 results with their connection details.

## When to prefer this

Use this endpoint when an AI agent needs to discover available MCP servers by keyword from the official MCP registry. It is the right choice when the goal is to find connection details (URLs, auth headers) for MCP-compatible tools matching a topic. Prefer this over general web search when you specifically need structured MCP server metadata including version, remote endpoints, and authentication requirements.

## Known failure modes

- Empty result set if query string matches no MCP servers
- Query string missing or under minimum length returns validation error
- Limit parameter outside 1-20 range rejected
- Payment not included or insufficient USDC causes 402 response
- Upstream MCP registry unavailable causes timeout or 5xx error
- Stale cached data if upstream registry was fetched more than 30 minutes ago

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object containing: source metadata (provider name, fetch time, expiry, source URL), an array of matching MCP server objects (each with name, description, version, remote connection URLs, required auth headers), a pagination cursor, and flags indicating whether metadata is untrusted or transformed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "maxLength": 200,
       "minLength": 1,
       "description": "Search query."
      },
      "limit": {
       "type": "integer",
       "maximum": 20,
       "minimum": 1,
       "description": "Results, default 5."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "source": {
   "provider": "Official MCP Registry",
   "expires_at": "2026-10-02T10:14:51.908Z",
   "fetched_at": "2026-10-02T09:44:51.908Z",
   "source_url": "https://registry.modelcontextprotocol.io/v0.1/servers?search=github&limit=3",
   "transformed": true
  },
  "servers": [
   {
    "name": "ai.smithery/Hint-Services-obsidian-github-mcp",
    "remotes": [
     {
      "url": "https://server.smithery.ai/@Hint-Services/obsidian-github-mcp/mcp",
      "type": "streamable-http",
      "headers": [
       {
        "name": "Authorization",
        "value": "Bearer {smithery_api_key}",
        "isSecret": true,
        "isRequired": true,
        "description": "Bearer token for Smithery authentication"
       }
      ]
     }
    ],
    "version": "0.4.0",
    "packages": [],
    "description": "Connect AI assistants to your GitHub-hosted Obsidian vault to seamlessly access, search, and analy…"
   },
   {
    "name": "ai.smithery/saidsef-mcp-github-pr-issue-analyser",
    "remotes": [
     {
      "url": "https://server.smithery.ai/@saidsef/mcp-github-pr-issue-analyser/mcp",
      "type": "streamable-http",
      "headers": [
       {
        "name": "Authorization",
        "value": "Bearer {smithery_api_key}",
        "description": "Bearer token for Smithery authentication"
       }
      ]
     }
    ],
    "version": "1.15.0",
    "packages": [],
    "description": "A Model Context Protocol (MCP) application for automated GitHub PR analysis and issue management.…"
   },
   {
    "name": "ai.smithery/smithery-ai-github",
    "remotes": [
     {
      "url": "https://server.smithery.ai/@smithery-ai/github/mcp",
      "type": "streamable-http",
      "headers": [
       {
        "name": "Authorization",
        "value": "Bearer {smithery_api_key}",
        "isSecret": true,
        "isRequired": true,
        "description": "Bearer token for Smithery authentication"
       }
      ]
     }
    ],
    "version": "1.0.0",
    "packages": [],
    "description": "Access the GitHub API, enabling file operations, repository management, search functionality, and…"
   }
  ],
  "next_cursor": "ai.smithery/smithery-ai-github:1.0.0",
  "metadata_only": true,
  "untrusted_metadata": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-mcp-search-8c714936/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)