# 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 and discovers 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-screened results for agent orchestration.

## Facts

- Endpoint: GET https://x402broker.com/v1/agent-tool-marketplace?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-9c2542eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ncO_yEfG0sKM7WJum21b8

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-9c2542eb
```

Example prompt: Search the agent tool marketplace for MCP servers or A2A tools that can do 'company enrichment' — I need to find the right capability to plug into my agent pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover new tools or MCP servers at runtime without hardcoding integrations, or when you want a single connection point that indexes 500+ tools with built-in safety filtering and token compression. Prefer it over manually curating tool lists or querying individual MCP registries separately.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for highly specific or obscure queries
- Endpoint URL verification fails if the target is offline or malformed
- Rate limiting at $0.01/call may apply if quota is exceeded
- Generic or ambiguous queries may return low-relevance results

## 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/agent-tool-marketplace)

## Output

Returns a structured list of matching MCP servers and A2A tools relevant to the capability query, with token-compressed metadata (85% compression), safety screening via Prompt-Guard firewall, and routing information. If an endpoint URL is provided, returns verification details about that endpoint's capability and safety status.

## 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-9c2542eb/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)