# 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 and routes across 500+ indexed MCP servers and A2A tools via a single connection with token compression and prompt firewall protection.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/mcp-router?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-7f6038d4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xli-X6TSb_k98eQvuYHyC

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-7f6038d4
```

Example prompt: Search the MCP router for tools that handle 'github security auditing' — I want to find available MCP servers or A2A agents I can route to for that capability.

## When to prefer this

Choose this endpoint when you need a single-connection gateway to discover and route across a large corpus of 500+ MCP servers and A2A tools without maintaining separate integrations. Ideal for agent swarms that need dynamic tool discovery, especially when token efficiency and prompt safety are priorities. Prefer over manual tool registries or direct MCP connections when you want centralized discovery with built-in firewall protection.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure capability queries
- Prompt-Guard firewall may block certain query patterns flagged as suspicious
- Rate limiting or payment failures at $0.01/call via x402
- Malformed endpoint URL when used in URL-verification mode returns error
- Index may not reflect newly added MCP servers immediately

## 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/mcp-router)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, including endpoint metadata, capability descriptions, and routing information, filtered through a Prompt-Guard firewall with 85% token compression applied to responses.

## 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-7f6038d4/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)