# 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 domain-osint.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes across 500+ indexed MCP servers and A2A tools by capability query, returning compressed, firewall-filtered results via a single meta-router connection.

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/api/mcp/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-bda72ec1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PuX2kFCE48SJTvaEN-8wv

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 domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-bda72ec1
```

Example prompt: Search the MCP and A2A tool index for tools that can do 'company enrichment' — I want to see what's available across all indexed servers so I can pick the best one for my agent pipeline.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover, verify, or route to MCP or A2A tools at runtime across a large indexed catalog — especially useful for agent orchestration layers, swarm routers, or when the right downstream tool is not known in advance. Prefer this over direct tool calls when you need 85% token-compressed capability metadata or want firewall-safe tool discovery.

## Known failure modes

- Empty or whitespace query returns validation error
- No matching tools found for niche or misspelled capability query
- Endpoint URL verification returns unknown if URL is not indexed
- Rate limiting or 402 payment required if per-call quota exceeded
- Firewall may block queries flagged as prompt injection attempts

## 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://domain-osint.agentdiet.dev/api/mcp/audit)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the capability query, including tool metadata, routing info, and compressed capability descriptions filtered 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/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-bda72ec1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)