# 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 via a single connection, with token compression and prompt-injection firewall protection.

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/b2a-router?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-8bb9d4b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k3eOwytkpWdcTwl9agmL7

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-8bb9d4b4 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any available tools that handle SEC filings or company enrichment, and route my query through the safe-proxy swarm router.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call without hardcoding individual tool URLs, especially when building swarm agents that must route across many tools, when token budget is constrained and 85% compression is needed, or when untrusted tool responses must pass through a prompt-injection firewall before being consumed.

## Known failure modes

- Empty or vague query returns low-confidence or no tool matches
- Queried capability not yet indexed among the 500+ servers returns empty results
- Endpoint URL verification for an unknown tool returns unverifiable status
- Prompt-Guard firewall blocks a matched tool response flagged as injection risk
- Payment failure via x402 prevents call execution

## 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/b2a-router)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, with routing metadata, capability descriptions, and optionally a compressed proxied response from the matched tool, all 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-8bb9d4b4/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)