# 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 mcp-security.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes across 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt injection firewall

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/x402-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-88de6323
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kNXNczIvG6XFQSRQYRviC

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 mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-88de6323
```

Example prompt: Search the MCP tool registry for any servers that handle 'SEC filings' or 'company enrichment' and tell me which ones are available and what they do.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability, rather than hardcoding a specific tool. Especially useful for swarm routing, meta-agent orchestration, or when building agents that must self-configure their tool set at runtime. The built-in Prompt-Guard firewall makes it safer than directly querying untrusted tool registries.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or misspelled capability query
- Endpoint URL verification returns unreachable or non-compliant status
- Rate limiting or payment failure (x402) if balance is insufficient
- Prompt-Guard firewall blocks queries that appear to contain injection attempts

## 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://mcp-security.agentdiet.dev/v1/x402-broker)

## Output

Returns a list of matching MCP servers or A2A tool endpoints relevant to the capability query, including tool descriptions, connection metadata, and security-filtered (Prompt-Guard) summaries with up to 85% token compression applied.

## 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/mcp-security-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-88de6323/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)