# 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 catalog of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed metadata and prompt-guard firewall protection.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/broker/catalog?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-3cd11c3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nX4ZzkU2SJXRPy7Sg_kxQ

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-3cd11c3c
```

Example prompt: Search the agent tool catalog for MCP servers that can handle SEC filings or company enrichment — I want to see what's available with a single query.

## When to prefer this

Choose this endpoint when an AI agent or developer needs to discover which MCP servers or A2A tools exist for a given capability without knowing specific endpoints in advance. It is the right choice when building multi-agent pipelines that need dynamic tool routing, when exploring what agent infrastructure is available, or when verifying whether a specific endpoint URL is cataloged. Prefer this over direct API calls when you need a single-connection meta-index across 500+ tools with built-in prompt-guard safety.

## Known failure modes

- Missing or empty query parameter returns validation error
- Query matches no tools in catalog returns empty result set
- Upstream MCP server index unavailable causes catalog fetch failure
- Payment not included or insufficient returns HTTP 402
- Overly broad query returns too many unranked results
- URL verification query for malformed URL returns parsing error

## 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/broker/catalog)

## Output

A catalog listing of matching MCP servers and A2A tools filtered by the capability query, with endpoint metadata, tool descriptions, and token-compressed summaries. Results include tool names, capabilities, connection details, and compatibility information for agent orchestration.

## 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-3cd11c3c/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)