# x402broker B2A Router — Universal MCP & A2A Meta-Router

> x402broker B2A Router — Universal MCP & A2A Meta-Router is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-20).

Single-connection meta-router that indexes and proxies 500+ MCP servers and A2A tools with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://x402broker.com/v1/b2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402broker-b2a-router-universal-mcp-a2a-meta-router-964d9c3b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gkz5YOLjakbAUiFYgpaAC

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-b2a-router-universal-mcp-a2a-meta-router-964d9c3b
```

Example prompt: Search across all available MCP servers and A2A tools to find something that can scrape live web pages — give me the top results with compressed metadata so I can pick the right one.

## When to prefer this

Choose this endpoint when an AI agent needs to discover or route to any of hundreds of MCP servers or A2A tools through a single connection, especially when token efficiency matters (85% compression) or when security against prompt injection is required. Prefer over manually managing multiple MCP connections or building custom tool registries.

## Known failure modes

- Query too vague returns broad or unhelpful tool list
- No matching tools found for a highly specific query
- Prompt-Guard firewall may block legitimate but ambiguous queries
- Rate limiting or payment failure at $0.01 USDC per call
- Downstream MCP server unavailability reduces result completeness

## 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

A compressed, token-efficient list of matching MCP servers and/or A2A tools relevant to the query, including metadata, routing info, and safe-proxied access details. Results are filtered through a Prompt-Guard firewall to block prompt-injection risks.

## 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-b2a-router-universal-mcp-a2a-meta-router-964d9c3b/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)