# 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 2026-10-23).

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/b2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-47afa3a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f-IK6h8eJ6d_gvqt_6UKJ

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-47afa3a2 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any servers that can handle 'github security audits' — I need a single proxied connection with token-compressed results and the Prompt-Guard firewall active.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to use for a given capability, rather than hardcoding a specific tool. Ideal for agent swarms that need a single-connection meta-router, want token-efficient responses, or require a firewall layer before forwarding prompts to external tools.

## Known failure modes

- Empty or too-vague query returns no matching tools
- Unknown endpoint URL fails verification against index
- Prompt-Guard firewall blocks a query flagged as adversarial
- Index may not include very new or private MCP servers
- Response schema is generic object — callers must handle variable structure

## 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/b2a-router)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, with token-compressed metadata (up to 85% compression), Prompt-Guard firewall validation applied, and proxied access details for single-connection routing.

## 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-47afa3a2/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)