# 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 2026-10-28).

Meta-router that searches and proxies 500+ MCP servers and A2A tools via a single connection, with 85% token compression and a Prompt-Guard firewall.

## Facts

- Endpoint: POST https://x402broker.com/v1/workflows/execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-c160257f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W25ODJw1J872qHYSLti37

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-c160257f -d '<json body>'
```

Example prompt: Search your MCP tool index for anything that handles context compression or GitHub security auditing — I want to see what's available and get a token-efficient result back.

## When to prefer this

Choose this endpoint when you need to discover, compare, or proxy calls to any of 500+ MCP servers or A2A tools without managing individual connections. It is the right choice when you want a single-connection meta-router with built-in token compression and prompt safety filtering, especially when you don't know which specific tool to call and need capability-based discovery first.

## Known failure modes

- Empty or vague query returns no useful tool matches
- Query too broad matches hundreds of tools with low relevance scores
- Prompt-Guard firewall blocks a query flagged as potentially unsafe
- Target MCP server is offline or rate-limited, causing proxy failure
- Malformed query string causes a 400 validation error
- Payment not included or invalid causes a 402 payment required 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://x402broker.com/v1/workflows/execute)

## Output

Returns matched MCP servers and A2A tools relevant to the search query, with token-compressed responses (up to 85% reduction), Prompt-Guard firewall filtering applied, and optionally a proxied result from the selected tool endpoint.

## 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-c160257f/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)