# 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).

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning matched endpoints with 85% token compression via a prompt-guard-protected proxy router.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/x402-gateway?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-7d1098ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__Ha6Bs_KotxRSduDCDNWJ

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-7d1098ce
```

Example prompt: Search the agentdiet meta-router for MCP tools related to 'context compression' — I want to find available agent tools that can compress tokens in my pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability without hard-coding tool registries. It is ideal for building swarm routers, capability-aware orchestrators, or any system that needs to find the right sub-agent tool at runtime across a large index of 500+ servers, especially when token budget is a concern due to its 85% compression.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query string missing or too short triggers a validation error
- No matching tools found for a niche capability returns empty result set
- Payment not completed (x402) results in 402 Payment Required response
- Service unavailable if meta-index is being updated

## 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/x402-gateway)

## Output

Returns a structured list of matched MCP servers and A2A tools relevant to the capability query, including compressed tool descriptions, routing metadata, and endpoint identifiers — delivered with 85% token compression 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-7d1098ce/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)