# 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 an index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered tool metadata via a single meta-router connection

## Facts

- Endpoint: GET https://x402broker.com/v1/broker/execute?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-c25ac692
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_668djTOdYkKAMUyfKczIG

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-c25ac692
```

Example prompt: Search the MCP and A2A tool index for anything that handles SEC filings or company enrichment — I need to find the right tool to plug into my agent pipeline.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hard-coding a tool. Ideal for swarm architectures where the right downstream tool is not known in advance, or when you want a single meta-connection that routes to 500+ tools with built-in safety filtering and token compression.

## Known failure modes

- Empty or too-broad query returns too many results with low relevance
- Unknown or unsupported capability returns empty result set
- Endpoint URL verification query returns invalid or unreachable status
- Rate limiting or payment failure if x402 micropayment not processed
- Firewall (Prompt-Guard) may block queries flagged as unsafe or adversarial

## 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/broker/execute)

## Output

Returns a filtered, token-compressed listing of matching MCP servers and A2A tools from the 500+ indexed entries, including tool metadata and routing information, filtered through the 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/x402broker-com-universal-a2a-mcp-tool-discovery-safe-proxy-swarm-router-c25ac692/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)