# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed tool metadata with prompt injection protection

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/workflows/execute?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-a1d7d5c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ov26yxrwSppckzHe80rHV

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-a1d7d5c6
```

Example prompt: Search the MCP and A2A tool index for anything that handles 'SEC filings' and show me what's available with its compressed metadata.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools are available for a specific capability across a large multi-server index in a single call, especially when token efficiency matters. It is preferable to manually curating MCP server lists or calling individual tool registries, and adds a prompt-injection firewall layer for safe proxying.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query string too short (minLength:1 enforced but semantically empty queries yield poor results)
- Index may not include newly launched MCP servers
- Prompt-Guard firewall may flag or sanitize certain query strings containing injection patterns
- HTTP 402 payment required if x402 payment not attached
- Endpoint URL verification mode may time out on slow remote servers

## 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/workflows/execute)

## Output

Returns a compressed listing of matching MCP servers and A2A tool endpoints relevant to the capability query, including tool metadata, with token-efficient output and prompt-injection firewall applied.

## 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-a1d7d5c6/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)