# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router is a paid API for AI agents from shopify-spy.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes queries across 500+ indexed MCP servers and A2A tools with token compression and prompt-injection firewall protection

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/tool-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: shopify-spy.agentdiet.dev
- Website: https://shopify-spy.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-501676a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x_zENLlqtRPCM9SXPFndd

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 shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-501676a8
```

Example prompt: Search the tool-broker for any indexed MCP servers or A2A tools that handle 'company enrichment' so I can pick the best one for my lead research pipeline.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool supports a given capability at runtime, rather than hardcoding tool selections. Particularly useful for swarm architectures, meta-agents, or orchestrators that need to route subtasks to specialized tools without prior knowledge of what's available. The built-in Prompt-Guard firewall and 85% token compression make it preferable over raw tool directories when safety and context efficiency matter.

## Known failure modes

- Missing or empty query parameter returns validation error
- No matching tools found for niche capability query returns empty result set
- Endpoint URL verification may fail if URL is not indexed
- Rate limiting or payment failure (402) if x402 micropayment not properly handled
- Malformed query may return unexpected or irrelevant results

## How this service works

Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://shopify-spy.agentdiet.dev/v1/tool-broker)

## Output

Returns a structured object listing matching MCP servers or A2A tools from a 500+ entry index, including compressed metadata about each tool's capabilities, along with routing information and prompt-guard safety verdicts for any queried endpoints.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shopify-spy-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-501676a8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-spy.agentdiet.dev](https://www.zero.xyz/host/shopify-spy.agentdiet.dev/llms.txt)