# 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 routes across 500+ indexed MCP servers and A2A tools via a single query, with token compression and prompt firewall protection.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/universal-mcp-gateway?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-605fe8eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5l3KsKcTqn4I0SPd9KDN9

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-605fe8eb
```

Example prompt: Search the universal MCP gateway for tools that handle SEC filings and company enrichment — I need to find which indexed servers support those capabilities for my agent pipeline.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A agents support a given capability without hardcoding endpoints, especially when building multi-agent swarms or orchestrators that need to route tasks to the right tool at runtime. Prefer it over manual tool registries when breadth of coverage (500+ servers) and token efficiency matter.

## Known failure modes

- Missing or empty query string returns validation error
- Query matches no indexed tools and returns empty result set
- Gateway index out of date if newly added MCP servers haven't been crawled
- Rate limiting or payment failure if x402 payment header is missing or invalid
- Broad or ambiguous queries may return too many low-relevance results

## 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/universal-mcp-gateway)

## Output

A list of matching MCP servers or A2A tool endpoints relevant to the capability query, with compressed metadata describing each tool's capabilities, endpoint URLs, and compatibility signals — filtered through a Prompt-Guard firewall for safety.

## 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-605fe8eb/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)