# 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 and discovers MCP servers and A2A agent tools from a 500+ index with token-compressed, prompt-guarded results via a single connection

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/agent-tool-marketplace?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-bd761b20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FECp1dOh1_NQcWbxUvjXp

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-bd761b20
```

Example prompt: Search the MCP tool marketplace for anything that can do 'company enrichment' or 'B2B lead data' — I want to find available agent tools I can plug into my workflow.

## When to prefer this

Choose this endpoint when you need to discover or search for MCP servers and A2A agent tools by capability without maintaining individual connections to hundreds of separate services. It is especially useful when you want token-efficient results from a broad ecosystem search, need a safe-proxied gateway with prompt injection protection, or want to verify whether a specific tool endpoint exists in the index.

## Known failure modes

- Empty or vague query returns low-relevance or no results
- Query too broad returns overwhelming number of matches
- Endpoint URL verification query may return 404 if the tool is not indexed
- Rate limiting or payment failure (HTTP 402) if payment is not processed correctly
- Prompt-Guard firewall may block results flagged as unsafe

## 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/agent-tool-marketplace)

## Output

Returns a list of matching MCP servers and A2A tools from the 500+ index, with capability descriptions and endpoint metadata, compressed to reduce token usage, and filtered through a Prompt-Guard firewall to block malicious tool responses.

## 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-bd761b20/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)