# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning matched endpoints with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://x402broker.com/v1/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-ed3041a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JXHn1zXYxXlner4qFEjSr

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-ed3041a6
```

Example prompt: Search the MCP and A2A tool index for anything that can do 'company enrichment' — I want to see what servers are available and which ones look safest to route through.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools exist for a given capability at runtime, rather than hard-coding tool connections. Especially useful for swarm orchestration, building meta-agents that self-route to the best tool, or safely proxying through a firewall-protected intermediary that screens for prompt injection.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query terms too niche to match indexed servers returns empty result set
- Endpoint URL verification fails if the URL is not in the index
- Rate limiting or payment failure (HTTP 402) if x402 payment not properly handled
- Malformed query parameter 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://x402broker.com/v1/execute)

## Output

Returns a structured list of matched MCP servers or A2A tools relevant to the capability query, with token-compressed metadata, routing recommendations, and Prompt-Guard firewall status indicating safety of the matched endpoints.

## 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-ed3041a6/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)