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

Searches an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed metadata and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/security-audit-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-824032c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ulr_Ig9Tf2jjNZDWnGD_u

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 email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-824032c4
```

Example prompt: Search the MCP and A2A tool index for servers that support 'context compression' — I want to find the best available endpoints I can plug into my agent swarm.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover available MCP servers or A2A tools by capability rather than hard-coding specific endpoints. Ideal for agent orchestration layers that need to route tasks to appropriate tools at runtime, or when verifying the safety of an unknown endpoint URL before proxying traffic through it. Prefer over manually curated tool lists when the tool landscape is broad or frequently changing.

## Known failure modes

- Missing or empty 'query' parameter returns a 400 validation error
- Query matches no indexed tools — returns empty result set
- Endpoint URL verification finds no known record — returns unverified status
- Payment not completed via x402 results in 402 Payment Required
- Upstream index temporarily unavailable causing 503 or timeout

## 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://email-verify.agentdiet.dev/v1/security-audit-dag)

## Output

Returns a list of matching MCP servers and A2A tools relevant to the capability query, with compressed metadata (85% token reduction), safety ratings from the Prompt-Guard firewall, and endpoint details including URLs and supported protocols.

## 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/email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-824032c4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)