# 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 routes to 500+ MCP servers and A2A tools through a single meta-router connection with token compression and prompt firewall protection

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/mcp-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-537d4564
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d5wmgDBSU82FfuMioG6DD

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-537d4564 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers or A2A tools that can handle 'company enrichment' — I want to find what's available and route to the best match.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A tools are available for a given capability without maintaining your own index. It is especially useful when building agent swarms that need a single routing layer across hundreds of tools, when token budget is a concern (85% compression), or when you want prompt injection protection baked into tool discovery.

## Known failure modes

- Empty or vague query string returns no useful matches
- Query for a capability not yet indexed returns empty results
- Prompt-Guard firewall may block queries flagged as adversarial
- Network timeout if upstream MCP servers are unreachable
- Payment required (HTTP 402) if x402 micropayment not included

## 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 matched set of MCP servers or A2A tools from the 500+ indexed catalog that match the capability query, with token-compressed responses (up to 85% compression) and metadata about each matching endpoint, filtered through a Prompt-Guard firewall for safety.

## 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-537d4564/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)