# 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).

Meta-router that indexes 500+ MCP servers and A2A tools, letting agents discover and proxy-call any capability via a single connection with 85% token compression and prompt injection firewall.

## Facts

- Endpoint: POST https://x402broker.com/v1/b2b-osint-dag?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-fc159501
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wj2XT__Ll1Pr-TDxqjavr

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-fc159501 -d '<json body>'
```

Example prompt: Search the MCP tool index for servers that handle 'company enrichment' or 'B2B lead data' and route me to the best match with token-compressed results.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which of 500+ MCP servers or A2A tools best fits a capability requirement, rather than hardcoding tool connections. Ideal for swarm architectures where agents must self-route to the right tool at runtime, or when you need a safe proxy layer with prompt injection protection. Prefer over direct MCP connections when token budget is tight (85% compression) or when you don't know in advance which tool to call.

## Known failure modes

- No matching tools found for the query — returns empty result set
- Query too vague — may return low-relevance tool matches
- Prompt injection detected by firewall — request blocked with guard alert
- Upstream MCP server unavailable — proxy call fails with connectivity error
- Rate limit exceeded — 402 payment required for additional calls
- Invalid or unresolvable endpoint URL when used in verification mode

## 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 list of matching MCP servers or A2A tools ranked by relevance to the query, with 85% token-compressed capability descriptions, safety-filtered through a Prompt-Guard firewall, and optionally the proxied response from the routed tool.

## 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-fc159501/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)