# 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 to 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt injection firewall.

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/v1/security-audit-dag?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-3dc17d54
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A1LwBQG_3QDKgNMdmG5zB

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-3dc17d54
```

Example prompt: Search the MCP and A2A tool index for anything that can do company enrichment or B2B lead data — I want to find the best available tool and route to it from a single connection.

## When to prefer this

Choose this endpoint when you need to discover or route to the right MCP server or A2A tool from a large catalog without managing individual connections. It is especially useful when the target capability is unknown ahead of time, when you need token-efficient tool schemas, or when you want prompt injection protection built into the routing layer. Prefer alternatives if you already know the exact endpoint URL and want to call it directly.

## Known failure modes

- Missing or empty query parameter returns validation error
- Query matches no indexed tools, returning empty result set
- Upstream MCP server or A2A endpoint is unreachable, causing partial results
- Prompt-Guard firewall flags query as potentially adversarial and blocks routing
- Rate limiting or payment failure (HTTP 402) prevents the call from completing

## 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/v1/security-audit-dag)

## Output

Returns a list of matching MCP servers or A2A tools from the 500+ indexed catalog, with compressed schema metadata, relevance ranking, and routing information. May include tool descriptions, endpoint URLs, capability tags, and safety status from 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-3dc17d54/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)