# 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 2026-10-28).

Meta-router that searches 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered tool results via a single connection

## Facts

- Endpoint: POST https://hn-pulse.agentdiet.dev/v1/x402-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-cd96e873
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dstP9kePr0iBAiV36L-nM

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-cd96e873 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for something that handles SEC filings and company enrichment — I need to find the right tool to route my agent to.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding tool URLs. Ideal for swarm architectures that need to route tasks to specialized tools at runtime. Prefer this over manually curating tool lists when operating across 500+ potential tools, or when you need Prompt-Guard firewall protection on tool responses before passing them to downstream agents.

## Known failure modes

- Empty or vague query returns no matches or low-relevance results
- Prompt-Guard firewall blocks queries containing injection patterns
- Unknown or unindexed endpoint URL returns no verification result
- Rate limiting or 402 payment failure if x402 payment is not provided
- Malformed query (minLength not met) returns validation 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/x402-broker)

## Output

Returns a compressed, Prompt-Guard-filtered list of matching MCP servers and A2A tools relevant to the query, including tool metadata, routing recommendations, and capability descriptions — with up to 85% token compression applied to the response.

## 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-cd96e873/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)