# 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 and routes queries across 500+ MCP servers and A2A tools with token compression and prompt firewall protection via a single meta-router connection.

## Facts

- Endpoint: GET https://x402broker.com/paid?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-e47d4ff8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0p1w2fDT4NPjCB8h0NK5Q

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-e47d4ff8
```

Example prompt: Search the x402broker MCP meta-router for tools that handle SEC filings and company enrichment — I want to find the best available endpoints across all 500+ indexed servers for those capabilities.

## When to prefer this

Choose this endpoint when you need to discover, compare, or route to any of 500+ MCP servers or A2A tools from a single connection rather than maintaining separate integrations. Particularly valuable when building agent swarms that need dynamic tool selection, when verifying that an external MCP endpoint is safe before calling it, or when token budget is tight and you need compressed capability responses. Prefer over direct tool calls when the right downstream tool is unknown at agent design time.

## Known failure modes

- Empty query string returns validation error
- Query matches no indexed tools — returns empty result set
- Endpoint URL verification fails if URL is malformed or not indexed
- Token compression may truncate low-confidence results
- Service unavailable if x402 payment processing fails
- Rate limiting if call volume exceeds plan threshold

## 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/paid)

## Output

Returns a compressed, structured list of matching MCP servers or A2A tools relevant to the query, including endpoint metadata, capability descriptions, and safety verification status — with up to 85% token reduction applied to the response payload.

## 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-e47d4ff8/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)