# 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 x402-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt-injection firewall.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/broker/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-13a03bb0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3BgmdzuvAMjA2Kc2sn-mk

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 x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-13a03bb0
```

Example prompt: Search the MCP and A2A tool index for any available tools that handle SEC filings or company enrichment — I want to find the right capability to route my request through.

## When to prefer this

Use this endpoint when an AI agent needs to discover or route to one of many MCP or A2A tools without maintaining individual connections to each. Prefer it when you want a single normalized interface across 500+ tools, when token budget is tight (85% compression), or when you need prompt-injection protection before forwarding queries to external agents.

## Known failure modes

- No matching tools found for the given query — returns empty result set
- Query string is empty or too short — rejected by schema validation (minLength:1)
- Upstream MCP server is offline — routing may fail or return degraded results
- Prompt injection attempt detected by Prompt-Guard firewall — request blocked
- Payment not processed (x402) — endpoint returns 402 before serving results

## 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://x402-audit.agentdiet.dev/v1/broker/execute)

## Output

Returns a list of matching MCP servers or A2A tool endpoints relevant to the capability query, including metadata about each tool. Results are token-compressed (up to 85% reduction) and have passed through the Prompt-Guard firewall before being returned.

## 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/x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-13a03bb0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)