# 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 2026-10-23).

Searches and proxies 500+ MCP servers and A2A tools via a single meta-router connection with token compression and prompt firewall protection.

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/a2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-d8ee1ab4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BPXYd9mg7knMDSy1j9DWH

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-d8ee1ab4 -d '<json body>'
```

Example prompt: Search the MCP meta-router for tools that can do 'SEC filings' and return the best matching endpoints I can use.

## When to prefer this

Choose this endpoint when you need to discover or route to any of 500+ MCP servers or A2A tools from a single connection, especially when token efficiency matters or when you need a safety firewall layer between your agent and external tools. Prefer this over direct MCP connections when the target tool is unknown and needs to be discovered first.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for an obscure capability query returns empty result set
- Firewall (Prompt-Guard) blocks queries containing prompt injection patterns
- Upstream MCP server unavailable causes partial results
- Malformed endpoint URL in query returns verification error

## 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/a2a-router)

## Output

Returns a structured list of matching MCP servers or A2A tools relevant to the query, including endpoint URLs, capability descriptions, and routing metadata — delivered with 85% token compression and 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/email-verify-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-d8ee1ab4/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)