# 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 capabilities across 500+ MCP servers and A2A tools via a single meta-router connection with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://x402broker.com/v1/b2b-osint-dag?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-bb9af009
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6_yjilxXZ-7Hd4K2gZTn0

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-bb9af009
```

Example prompt: Search the MCP tool index for any available servers that handle SEC filings or company financial enrichment — I need to find the best capability for pulling structured filing data.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which tools or MCP servers can satisfy a capability requirement at runtime, rather than hardcoding a specific API. Especially useful for multi-agent swarms that need to delegate subtasks to specialized tools without pre-configuring each integration. Prefer over direct API calls when the best tool for a job is unknown in advance or when building a tool-agnostic orchestration layer.

## Known failure modes

- Empty or too-vague query returns no matches or overly broad results
- Endpoint URL verification fails if the target is not indexed
- Rate limiting or 402 payment required if quota exceeded
- Firewall may block or sanitize queries containing prompt-injection patterns
- Generic capability terms like 'search' may return too many results to be actionable

## 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/b2b-osint-dag)

## Output

Returns a compressed, structured listing of matching MCP servers and A2A tools relevant to the search query, including capability descriptions and endpoint metadata, filtered through a prompt-injection firewall for safe consumption by downstream agents.

## 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-bb9af009/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)