# 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).

Routes a capability search query through a meta-index of 500+ MCP servers and A2A tools, returning matching endpoints with token-compressed results and prompt-guard firewall protection.

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/mesh?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-19e95808
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3RimEZwLf2HuWy7cz6x8P

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-19e95808 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle 'SEC filings' or 'company enrichment' — I need to find available agent tools I can route those tasks through.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A tools are available for a given capability, rather than hardcoding a specific tool. Best suited for meta-agent orchestrators, swarm routers, or agent pipelines that need to find the right tool at runtime. Prefer this over direct tool calls when the target capability is unknown or when you want a single connection point that indexes 500+ tools with built-in safety filtering.

## Known failure modes

- Empty or vague query returns no meaningful results
- Query matches no indexed tools — empty result set returned
- Prompt-Guard firewall blocks queries flagged as injection attempts
- Payment required (HTTP 402) if x402 credits are not provided
- Timeout if the mesh index is under load
- Malformed query (minLength not met) returns 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/mesh)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the search query, with token-compressed metadata (up to 85% compression), safety-filtered through the Prompt-Guard firewall. Response is a JSON object with discovered endpoint details, capability descriptions, and routing information.

## 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-19e95808/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)