# 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 2026-11-08).

Searches and routes queries across 500+ indexed MCP servers and A2A tools via a single meta-router connection with token compression and prompt injection firewall

## Facts

- Endpoint: POST https://x402broker.com/v1/web-rag-shield-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-11-08
- 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-70ff07a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2nrRUemAoOhmFcvuB-g0W

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-70ff07a7 -d '<json body>'
```

Example prompt: Search your meta-router index for MCP tools or A2A agents that can handle SEC filings and company financial enrichment — I want to find what's available and route to the best one.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given task, rather than hardcoding tool references. It is especially useful for multi-agent swarms that need runtime tool routing, or when you want a safety layer (Prompt-Guard firewall) before proxying to external tools. Prefer this over manual tool registries when your agent needs to search across 500+ tools in a single connection with compressed token output.

## Known failure modes

- Query too vague returns no relevant matches
- Endpoint URL not found in index returns empty result
- Prompt-Guard firewall blocks a suspicious query
- Payment not fulfilled via x402 returns 402 error
- Malformed or empty query string rejected by schema validation

## 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/web-rag-shield-dag)

## Output

Returns a compressed, token-efficient list of matching MCP servers or A2A tools from the 500+ tool index, including capability metadata, routing recommendations, and Prompt-Guard firewall clearance status for discovered endpoints.

## 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-70ff07a7/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)