# 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 x402-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes queries across 500+ MCP servers and A2A tools via a single connection with token compression and prompt injection firewall

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/swarm-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-8f51c1fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gs7QcZ7O2zMex4xGApTFi

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 x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-8f51c1fe
```

Example prompt: Search the swarm router for MCP tools that can do SEC filings lookup — I need to find available endpoints that handle that capability.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools handle a specific capability without knowing the exact endpoint URLs upfront — especially useful for agents that need dynamic tool selection across a broad ecosystem. Prefer this over hardcoded tool registries when the tool landscape is evolving or when you want safe proxying with built-in prompt injection protection.

## Known failure modes

- Empty query string returns validation error (minLength:1 required)
- No matching tools found for an obscure or misspelled capability query
- Upstream MCP server index may be stale if recently added servers are not yet indexed
- Payment failure (HTTP 402) if x402 USDC micropayment is not properly attached
- Timeout if the meta-router is overloaded routing across 500+ servers simultaneously

## 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://x402-audit.agentdiet.dev/v1/swarm-router)

## Output

Returns a ranked list of matching MCP servers and A2A tool endpoints relevant to the capability query, with compressed schema metadata, endpoint URLs, and routing guidance — filtered through a Prompt-Guard firewall to prevent prompt injection attacks.

## 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/x402-audit-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-8f51c1fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)