# 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 2026-10-28).

Searches an index of 500+ MCP servers and A2A tools by capability query, routing requests through a prompt-injection firewall and returning compressed, agent-ready results.

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/security-audit-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-f660b579
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8zR4PRr9QqVjPnnVFOmgE

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-f660b579 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool registry for any available tools that handle 'SEC filings' or 'company enrichment' — I want to see what's indexed and which endpoints I can route through.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability at runtime, especially when prompt-injection safety is a concern and token budget is limited. It is particularly useful for swarm-style agent architectures that need a single connection point to route across 500+ tools rather than hardcoding individual endpoints.

## Known failure modes

- Query string is empty or too vague — returns no matches or generic results
- Queried capability does not exist in the 500+ index — empty result set
- Payment not fulfilled via x402 — request blocked with 402 status
- Prompt-Guard firewall flags the query as potentially adversarial — request rejected
- Upstream MCP server unavailable — partial or degraded results returned

## 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 structured object listing matching MCP servers and A2A tools relevant to the query, including endpoint metadata, capability descriptions, and token-compressed summaries 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-f660b579/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)