# 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+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt-guard firewall

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/security-audit-dag?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-6c19ebc3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GBNBySnQMnRjkNn8Awn2X

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-6c19ebc3
```

Example prompt: Search across all available MCP servers and A2A tools to find something that handles 'company enrichment' — I need the best match from the index so I know which tool to call next.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool is best suited for a capability it lacks, rather than hard-coding a specific service. It is especially valuable in multi-agent swarm architectures where routing decisions must be made at runtime, or when verifying that a candidate endpoint URL is a legitimate registered MCP tool before delegating work to it.

## Known failure modes

- Empty or too-broad query returns low-relevance matches or empty result set
- Unknown or unregistered endpoint URL returns no verification result
- Prompt injection attempts in query string may be blocked by firewall returning a rejection signal
- Service unavailable if meta-router index is stale or offline
- Payment failure (x402) prevents access to 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/security-audit-dag)

## Output

Returns a list of matching MCP servers or A2A tools with metadata, relevance scores, and routing information; optionally returns verification status if an endpoint URL is submitted. Output is token-compressed (up to 85%) and filtered through a Prompt-Guard firewall.

## 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-6c19ebc3/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)