# 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 to discover matching capabilities by query, with token-compressed responses and a prompt-injection firewall.

## Facts

- Endpoint: GET https://hn-pulse.agentdiet.dev/v1/b2b-osint-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-0f3c8729
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iK7zgvk39F4Rbh6SCMb9v

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-0f3c8729
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'company enrichment' — I want to find which servers or tools can help me enrich business leads.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability at runtime, rather than hardcoding tool URLs. Especially useful when building swarm-style agent architectures that need to self-assemble toolchains, or when you want a single proxied, firewall-protected connection into hundreds of agent tools without managing individual integrations.

## Known failure modes

- Empty query string returns validation error (minLength:1 not met)
- Query matches zero tools in the index, returning an empty result set
- Upstream MCP index unavailable, causing 502 or timeout
- Payment not attached or insufficient (HTTP 402 if x402 micropayment missing)
- Prompt injection attempt blocked by Prompt-Guard firewall, returning sanitized or rejected response

## 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/b2b-osint-dag)

## Output

Returns a compressed, filtered list of matching MCP servers and A2A tools relevant to the query, including their names, descriptions, endpoint URLs, and routing metadata — all filtered through a prompt-injection firewall for safe consumption.

## 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-0f3c8729/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)