# 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 2026-10-23).

Searches and routes across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt firewall protection

## Facts

- Endpoint: POST https://x402broker.com/v1/tool-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-cf44c517
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nuirbjzET2cvuHkl165HS

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-cf44c517 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any available tools that handle SEC filings or financial data enrichment — I want to find the best single tool to route my agent through.

## When to prefer this

Choose this endpoint when an agent needs to discover the right tool from a large catalog without maintaining individual connections to hundreds of MCP servers. Ideal for multi-agent swarms that need dynamic tool routing, or when token efficiency is critical and you want a single trusted proxy with firewall protection rather than direct raw MCP connections.

## Known failure modes

- Query too vague — returns no matches or overly broad results
- Queried endpoint URL not found in index — returns empty result
- Rate limit exceeded — HTTP 429 response
- Payment not processed — HTTP 402 if x402 payment fails
- Index temporarily out of sync with upstream MCP servers — stale results returned

## 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/tool-broker)

## Output

Returns a list of matching MCP servers and A2A tools from the 500+ indexed registry, including tool metadata, capability descriptions, and routing information — delivered with 85% token compression and screened through the 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-cf44c517/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)