# 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+ indexed 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-execute?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-3ac3c794
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cNv-o6DCLUuhCP5hANuFE

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-3ac3c794
```

Example prompt: Search the swarm router for MCP tools that handle SEC filings and company enrichment — I want to find the best available tool for that capability.

## When to prefer this

Choose this endpoint when an agent needs to discover which of 500+ MCP servers or A2A tools best matches a capability need, rather than calling a specific known tool directly. Especially useful when the right tool is unknown, when token budget is limited (85% compression), or when prompt injection safety across third-party tools is required.

## Known failure modes

- Empty query string returns validation error
- Query matches no indexed tools — returns empty results set
- Upstream MCP server unavailable — router may return partial results
- Payment not fulfilled (HTTP 402) — requires x402 USDC micropayment before response
- Prompt injection attempt detected by firewall — request blocked

## 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-execute)

## Output

Returns a list of matching MCP servers or A2A tools indexed by the swarm router, along with token-compressed capability descriptions and routing metadata, filtered through a Prompt-Guard firewall to prevent prompt injection.

## 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-3ac3c794/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)