# 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 x402broker.com, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes queries across 500+ indexed MCP servers and A2A tools, returning ranked capability matches with token-compressed results and prompt-guard firewall protection.

## Facts

- Endpoint: GET https://x402broker.com/v1?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402broker.com
- Website: https://x402broker.com
- Canonical page: https://www.zero.xyz/c/x402broker-com-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-caf70a95
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tQu6-CLjafMQEdxNsP8_-

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 x402broker-com-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-caf70a95
```

Example prompt: Search the MCP and A2A tool index for any available capabilities related to 'GitHub security auditing' — I want to find and route to the best matching tool across all indexed servers.

## When to prefer this

Choose this endpoint when an AI agent needs to discover, enumerate, or route to capabilities across a wide ecosystem of MCP servers and A2A tools from a single connection point. Ideal for swarm orchestration, multi-agent workflows, or when you don't know which specific tool handles a capability. Prefer this over manually querying individual MCP directories or maintaining your own tool registry.

## Known failure modes

- Empty or vague query returns low-confidence or zero matches
- Queried endpoint URL not found in index returns no results
- Overly broad query returns too many matches with low relevance
- Prompt-Guard firewall may block or redact results from flagged tool descriptions
- Index may not reflect newly added MCP servers if not yet crawled

## 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://x402broker.com/v1)

## Output

Returns a ranked list of matching MCP servers and A2A tools from the 500+ item index, with token-compressed capability descriptions (up to 85% compression), relevance scores, and connection metadata. Results pass through the Prompt-Guard firewall to filter malicious or unsafe tool descriptions before returning.

## 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/x402broker-com-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-caf70a95/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)