# 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 queries across 500+ indexed MCP servers and A2A tools through a single meta-router connection with token compression and prompt-injection firewall.

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/mcp-gateway?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-8c740eb0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5nhVsiFFbDGgDhNxrl4Mp

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-8c740eb0 -d '<json body>'
```

Example prompt: Search the MCP gateway for tools that can handle SEC filings or company enrichment — I need to find the best available agent tool for that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can handle a given capability at runtime, rather than hardcoding tool references. Best when the agent's tool requirements are not known in advance, or when orchestrating swarms of agents that need to self-select appropriate sub-tools. Preferable to manual tool registries when operating across 500+ tools and needing a single-connection interface with built-in safety filtering.

## Known failure modes

- Empty or vague query returns no relevant tools
- Query matches too many tools leading to noisy results
- Indexed tool is stale or no longer available at its original endpoint
- Token-compressed response may omit details needed for full integration
- Payment (x402) failure if USDC balance is insufficient

## 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/mcp-gateway)

## Output

Returns matching MCP server or A2A tool references relevant to the search query, with compressed metadata about each discovered capability, including routing information and tool descriptions, filtered through a prompt-injection 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-8c740eb0/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)