# 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).

Meta-router that indexes 500+ MCP servers and A2A tools, enabling agents to discover and proxy-execute external capabilities through a single connection with token compression and prompt firewall protection.

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/broker/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-5f843bb2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DDfOU29WqRA-JKv4pBLTY

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-5f843bb2 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any available capabilities that handle SEC filings or company enrichment — I want to find the right tool to route my request through.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool handles a given capability without maintaining individual connections to hundreds of services. It is especially useful for swarm orchestration scenarios where the right downstream tool is not known in advance, or when you need a safe firewall-protected proxy layer between your agent and external tools.

## Known failure modes

- Empty or vague query returns no meaningful tool matches
- Queried capability not indexed among the 500+ tools, returning empty results
- Prompt-Guard firewall blocks a query flagged as potentially adversarial
- Downstream MCP server unavailable causing proxy execution failure
- Malformed query string returns a validation 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/execute)

## Output

Returns matching tool metadata, available MCP server endpoints, or routed execution results from the indexed 500+ A2A and MCP capabilities, delivered with up to 85% token compression and filtered through a 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-5f843bb2/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)