# 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 via a single meta-router connection with token compression and prompt firewall protection.

## Facts

- Endpoint: GET https://x402broker.com/api?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-5857f270
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0ZRZEwQAqdNZRO13sydoG

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-5857f270
```

Example prompt: Search the MCP tool index for any servers or A2A agents that can handle SEC filings and company enrichment — I want to find what's available and route my next query there.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can handle a given capability at runtime, rather than hardcoding tool integrations. Especially useful for swarm orchestration, multi-agent pipelines, or when the required capability is not known in advance. The built-in Prompt-Guard firewall makes it safer than direct proxy calls to unknown MCP servers.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for niche capability queries
- Endpoint URL verification fails if target is unreachable
- Payment not processed due to x402 protocol mismatch
- Overly broad queries return too many results with low relevance
- Rate limiting if too many queries fired in quick succession

## 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/api)

## Output

Returns a structured list of matching MCP servers and A2A tools relevant to the capability query, including endpoint metadata, tool descriptions, and routing recommendations — all compressed to minimize token usage, with prompt-injection threats filtered by the built-in Prompt-Guard firewall.

## 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-5857f270/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)