# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning token-compressed results routed through a prompt-injection firewall

## Facts

- Endpoint: GET https://x402broker.com/v1/execute?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-23a6a15b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GGLhoWnnI_NpAb33FkzcW

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-23a6a15b
```

Example prompt: Search the x402broker meta-index for any MCP servers or A2A tools that handle SEC filings and company enrichment — I need to discover what's available and get back compressed results safe from prompt injection.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools support a particular capability across a large index of 500+ options, especially when you want token-compressed output and built-in prompt-injection protection; prefer it over manual tool registries or direct MCP server lists when breadth of discovery and safety filtering matter

## Known failure modes

- Empty results if query does not match any indexed capability
- Endpoint URL verification may return not-found if the URL is not indexed
- Overly broad queries may return too many loosely-matched results
- Service unavailable if the meta-router backend is down
- Payment required errors if the x402 payment flow is not properly handled

## 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/execute)

## Output

Returns a token-compressed list of matched MCP servers or A2A tools relevant to the query, including endpoint metadata, capability descriptions, and safety status from the Prompt-Guard firewall; response is a generic JSON object with matched tool records

## 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-23a6a15b/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)