# 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 across 500+ indexed MCP servers and A2A tools with token-compressed results and prompt injection firewall protection

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/workflows/rag-context-sanitizer?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-b70815b9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_npWSjmG2SYPYOn02Nkeyk

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-b70815b9
```

Example prompt: Search the MCP and A2A tool index for anything that can do GitHub security audits — I want to see what's available across all indexed servers, with compressed results.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can fulfill a capability at runtime, rather than hard-coding tool endpoints. Especially useful when building swarm-style multi-agent systems that need safe, token-efficient tool routing across a large heterogeneous index, or when you need prompt-injection firewall protection on inbound tool context.

## Known failure modes

- Empty or too-short query returns no results
- Query matches no indexed tools — empty result set
- Endpoint URL verification returns unresolvable or non-compliant target
- Payment not processed — HTTP 402 returned blocking access
- Index may be stale if a tool was recently added or removed
- Overly broad queries may return too many loosely matched tools

## 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/workflows/rag-context-sanitizer)

## Output

Returns a filtered list of matching MCP servers and A2A tools from the 500+ indexed registry, with token-compressed metadata, relevance rankings, prompt-safety status, and routing recommendations for the queried capability or verified endpoint URL.

## 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-b70815b9/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)