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

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened results with token-efficient routing via a single connection.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/security-audit-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: hn-pulse.agentdiet.dev
- Website: https://hn-pulse.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-daad0a28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_80AqoBj1PQuXEDLoPjOiq

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 hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-daad0a28
```

Example prompt: Search the MCP tool index for agents that handle 'company enrichment' and show me what's available — I need token-compressed results I can route to directly.

## When to prefer this

Use this endpoint when an AI agent needs to discover which MCP servers or A2A tools are available for a given capability without connecting to each one individually. Prefer it over direct tool registries when you want 85% token-compressed results, built-in prompt injection firewall screening, and single-connection access to a broad index of 500+ tools spanning domains like SEC filings, GitHub audits, email verification, DEX intelligence, and more.

## Known failure modes

- Query returns no matches if the capability is not indexed among the 500+ servers
- Malformed or missing 'query' parameter returns a 400 validation error
- Payment required error (HTTP 402) if x402 USDC micropayment is not satisfied
- Timeout if downstream MCP server discovery is slow
- Results may be stale if indexed servers have changed their capabilities

## 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://hn-pulse.agentdiet.dev/v1/security-audit-dag)

## Output

A JSON object listing matched MCP servers or A2A tools relevant to the query, with compressed capability descriptions and routing references, filtered through a Prompt-Guard firewall to remove adversarial content.

## 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/hn-pulse-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-daad0a28/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hn-pulse.agentdiet.dev](https://www.zero.xyz/host/hn-pulse.agentdiet.dev/llms.txt)