# 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 an index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-verified endpoint results via a single meta-router connection.

## Facts

- Endpoint: GET https://x402broker.com/api/mcp/audit?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-3de417ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MbpUMrYOVIk9hXqglv2cS

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-3de417ad
```

Example prompt: Search the x402broker meta-router index for any MCP servers or A2A tools that handle SEC filings — I want to see verified, token-compressed results with Prompt-Guard firewall checks applied.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover, search, or route to one of 500+ MCP servers or A2A tools without managing multiple connections — especially when token budget is a concern (85% compression) or when prompt injection safety (Prompt-Guard firewall) is required before proxying to third-party tools.

## Known failure modes

- Empty query string returns validation error (minLength:1 not met)
- No matching tools found for obscure capability queries returns empty result set
- Endpoint URL verification may return unverified or flagged status if URL is not indexed
- Service may be unavailable if x402 payment layer fails to process
- Rate limiting or payment failure returns HTTP 402

## 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/mcp/audit)

## Output

Returns a token-compressed (up to 85% reduction) list of matching MCP servers or A2A tools from the 500+ endpoint index, including endpoint metadata, capability tags, Prompt-Guard firewall clearance status, and routing information for direct agent integration.

## 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-3de417ad/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)