# 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 2026-10-23).

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

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-7a5ea44c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A0Z6VUcVNUINi6nQmli7z

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-7a5ea44c -d '<json body>'
```

Example prompt: Search my connected tool hub for any MCP servers or A2A agents that can handle SEC filings and company enrichment — I want to see what's indexed and available to route to.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover, search, or route to one of many available MCP servers or A2A tools without hardcoding individual endpoints. Particularly useful in multi-agent swarm architectures where tool availability changes, or when you want a single-connection entry point with built-in token compression and prompt-injection protection across a large tool registry.

## Known failure modes

- No matching tools found for the query — returns empty results or low-confidence matches
- Query too vague or generic — may return unrelated tool categories
- Endpoint URL verification fails if submitted URL is unreachable or not an MCP/A2A endpoint
- Rate limiting or payment required (HTTP 402) if call quota exceeded
- Prompt-Guard firewall may flag or sanitize parts of results if injection patterns detected

## 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/web-rag-shield-dag)

## Output

Returns a list of matching MCP servers and A2A tool endpoints relevant to the query, including capability summaries, token-compressed descriptions, endpoint URLs, and routing metadata. Results are filtered through a Prompt-Guard firewall to prevent injection attacks from malicious tool responses.

## 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-7a5ea44c/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)