# 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 2026-10-23).

Meta-router that searches and proxies 500+ MCP servers and A2A tools via a single connection, with 85% token compression and prompt-injection firewall.

## Facts

- Endpoint: POST https://x402-audit.agentdiet.dev/v1/crypto-alpha-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-a7361ebb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3rwRv5FZ2LrAF6P0WgjiG

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-a7361ebb -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for servers that handle 'company enrichment' and route my request through the safe proxy with token compression enabled.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability rather than hardcoding a specific tool. It is especially useful for swarm orchestration, building tool-selection pipelines, or when the right downstream tool is unknown at design time. The built-in 85% token compression and prompt-injection firewall make it preferable over raw MCP server enumeration when safety and efficiency matter.

## Known failure modes

- Query too vague — returns low-relevance results or empty match set
- Payment not received (x402) — endpoint returns 402 requiring USDC micropayment before proceeding
- Prompt-Guard firewall blocks query if it resembles an injection attempt
- Upstream MCP server unavailable — proxy returns degraded or partial results
- Rate limiting if idempotency key is reused across distinct requests

## 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/crypto-alpha-dag)

## Output

Returns matching MCP server or A2A tool entries from a 500+ item index relevant to the query, with token-compressed metadata and safety-screened payloads. Response schema is a generic object containing discovered tool listings, endpoint details, and routing metadata.

## 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-a7361ebb/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)