# 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, returning token-compressed results filtered through a Prompt-Guard firewall

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/agent-tool-marketplace?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-aedf73c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X4LTehLTa06kL6C2dRKUo

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-aedf73c8 -d '<json body>'
```

Example prompt: Search the agent tool marketplace for MCP servers or A2A tools that handle SEC filings and company enrichment — I want to find the best available options with compressed results.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools are available for a given capability, rather than calling a known tool directly. It is especially useful for dynamic agent workflows that need to find and route to the right sub-tool at runtime, or when building swarm architectures that require tool federation across 500+ indexed servers.

## Known failure modes

- No matching tools found for the query — returns empty result set
- Query string too short or vague — may return irrelevant or overly broad results
- Downstream MCP server unavailable — proxy routing failure
- Payment not settled (x402) — request blocked before execution
- Prompt-Guard firewall blocks query if it resembles adversarial injection

## 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/agent-tool-marketplace)

## Output

A token-compressed list of matching MCP servers and A2A tools relevant to the query, filtered through a Prompt-Guard firewall to remove unsafe or malicious content, including tool metadata and routing information

## 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-aedf73c8/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)