# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router - Broker Catalog

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router - Broker Catalog 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).

Searches and retrieves a catalog of 500+ indexed MCP servers and A2A tools by capability query, returning token-compressed results with prompt-guard firewall protection.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/broker/catalog?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-1ab5863b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x0sF3QcIwTdgVHvYdLnt_

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-1ab5863b
```

Example prompt: Search the MCP tool catalog for any available servers that handle 'SEC filings' or 'company enrichment' — I need to find the right tool to plug into my agent workflow.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding connections. Prefer this over manual tool registries when you need a single-connection meta-router across 500+ services, want built-in Prompt-Guard firewall protection, or need token-compressed responses to minimize LLM context usage in agentic pipelines.

## Known failure modes

- Empty query string returns validation error (minLength:1 required)
- Query matches no indexed tools returns empty result set
- Downstream MCP server unavailable returns partial or degraded catalog
- Payment not fulfilled returns HTTP 402 requiring x402 micropayment
- Rate limiting or quota exceeded returns 429 error
- Malformed query or unsupported characters may return 400 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/broker/catalog)

## Output

Returns a catalog listing of matching MCP servers and A2A tools from the 500+ indexed services, with token-compressed metadata (up to 85% compression) about each tool's capabilities, endpoints, and connection details, 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-1ab5863b/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)