# 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).

Discovers and proxies to 500+ MCP servers and A2A tools via a single query, with token compression and prompt-injection firewall.

## Facts

- Endpoint: GET https://email-verify.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: 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-c02f307e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iV5t2_t9z6PESw7OgrHOb

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-c02f307e
```

Example prompt: Search the MCP tool index for anything that can do SEC filings or company enrichment — I want to find the best available tool and route my request through the safe proxy.

## When to prefer this

Use this endpoint when an agent needs to discover and route to specialized MCP or A2A tools without managing multiple direct connections, especially when token efficiency matters or when safety filtering of third-party tool responses is required. Prefer over direct MCP connections when operating in a multi-tool swarm context.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Queried capability not indexed in the 500+ server registry
- Downstream MCP server unavailable causing proxy timeout
- Prompt-Guard firewall blocks a query flagged as injection attempt
- Payment not processed via x402 resulting in 402 response

## 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/broker/execute)

## Output

Returns a list of matching MCP servers or A2A tools for the given query, with compressed response payloads (up to 85% token reduction), routing metadata, and safe-proxied results filtered through the 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-c02f307e/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)