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

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/tool-broker?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-c8b0253d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g56WKkCQ1Tq58SjM7ZCMM

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-c8b0253d -d '<json body>'
```

Example prompt: Search the tool broker for MCP servers or A2A tools that support 'SEC filings' and tell me which ones are available so I can pick the right one to call.

## When to prefer this

Choose this endpoint when you need to discover or route to one of many MCP servers or A2A tools without maintaining individual connections to each. Ideal for agent orchestration layers, swarm routers, or any workflow that needs to dynamically find the right sub-tool at runtime rather than hardcoding a specific API.

## Known failure modes

- Query too vague — returns no matching tools or low-relevance results
- Payment failure via x402 — returns HTTP 402 if USDC payment not accepted
- Invalid or empty query string — returns validation error
- Upstream MCP server unavailable — routing failure for specific tool
- Rate limiting or quota exceeded — returns error if too many requests in short window

## 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/tool-broker)

## Output

Returns a list of matching MCP servers and A2A tools from the 500+ indexed catalog, with metadata about each tool's capabilities, likely compressed by up to 85% for token efficiency, and filtered through the 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-c8b0253d/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)