# 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 queries across 500+ indexed MCP servers and A2A tools with token compression and a prompt-injection firewall

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/execute?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-3837d563
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x589S-dnFNBdo_fSOiSDs

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-3837d563 -d '<json body>'
```

Example prompt: Search across the MCP and A2A tool index for any servers or agents that can handle SEC filings analysis — I want to find the best available tool for that capability.

## When to prefer this

Use this endpoint when you need to dynamically discover which MCP server or A2A agent tool best handles a given capability at runtime, rather than hardcoding a tool choice. Prefer this over manually maintaining a tool registry, especially when working with a swarm of agents that need to self-route to the right capability. The built-in Prompt-Guard firewall makes it safer than direct tool-chaining in adversarial environments.

## Known failure modes

- Empty or vague query returns no relevant matches
- Query too broad returns too many low-confidence results
- No indexed tools match an obscure or niche capability
- Firewall blocks query flagged as containing prompt injection
- Payment not processed (x402) results in 402 response before results are returned
- Network timeout if upstream MCP servers are slow to respond

## 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/execute)

## Output

Returns a list of matching MCP servers or A2A tool entries from the 500+ index that best fit the capability query, with token-compressed metadata about each tool and routing information, filtered through a Prompt-Guard firewall to prevent injection attacks.

## 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-3837d563/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)