# 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+ indexed MCP servers and A2A tools with token compression and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://x402broker.com/v1/bundle-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-52eb9152
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iTeJQ84i6KKLA22WQXUPe

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-52eb9152
```

Example prompt: Search the x402broker tool index for MCP servers that handle SEC filings or company enrichment — I need to find the best available tool for that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool best matches a required capability, rather than hardcoding a specific tool. Especially useful when the target capability is uncertain, when token budget is tight (85% compression), or when untrusted tool responses need to pass through a prompt-injection firewall before reaching the agent.

## Known failure modes

- Empty or vague query returns no useful matches
- Query for an unsupported capability domain returns empty results
- Endpoint URL verification for an unknown URL returns unverified status
- Rate limit exceeded returns payment required (HTTP 402)
- Malformed query string 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/bundle-execute)

## Output

Returns a list of matching MCP servers or A2A tools indexed from 500+ sources, with token-compressed metadata and routing recommendations, filtered through a Prompt-Guard firewall to remove malicious or injected content.

## 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-52eb9152/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)