# 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 2026-10-28).

Searches and routes across 500+ MCP servers and A2A tools via a single meta-router connection with token compression and prompt safety filtering.

## Facts

- Endpoint: POST https://x402broker.com/v1/a2a-mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-cb126403
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tMcYoCYmBYw6odqq9eecf

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-cb126403 -d '<json body>'
```

Example prompt: Search the A2A and MCP tool registry for any servers that can handle SEC filings or financial intelligence — I need to find the right tool to route my agent to.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding a specific tool. Ideal for swarm architectures, multi-agent orchestration, or situations where the right downstream tool is unknown at design time. Also useful for verifying whether a specific endpoint URL is indexed and safe to call.

## Known failure modes

- Query too vague returns low-relevance or empty results
- Prompt injection attempts blocked by Prompt-Guard firewall
- Downstream MCP server unavailable causing routing failure
- Malformed query string returns validation error
- Payment not accepted causes HTTP 402 rejection

## 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/a2a-mesh)

## Output

Returns a compressed list of matching MCP servers or A2A tool endpoints relevant to the query, including tool metadata, capability summaries, and routing information, with 85% token compression applied and Prompt-Guard firewall screening.

## 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-cb126403/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)