# 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 a 500+ MCP server and A2A tool index with token-compressed results and a Prompt-Guard firewall, returning matching capability endpoints for a given query

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/v1/mcp-router?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-dc6471b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QXXC7PP69aPvnjX-SHby6

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-dc6471b0
```

Example prompt: Search the MCP router index for tools that handle SEC filings retrieval — I want to find which MCP servers or A2A tools can pull financial filings data for me.

## When to prefer this

Choose this endpoint when you need to discover MCP or A2A-compatible tools across a broad index without maintaining your own server registry, when you want token-efficient capability summaries, or when you need a safety-filtered proxy layer (Prompt-Guard) before routing to external agent tools. Prefer over manual MCP server lists when breadth of coverage (500+ servers) and security filtering are priorities.

## Known failure modes

- Empty query string returns a 400 validation error
- Query returns no matches if no indexed server covers the requested capability
- Endpoint URL verification may fail if the target server is offline or non-compliant
- Rate limiting or payment failure (x402) may block access
- Prompt-Guard firewall may reject queries it classifies as adversarial

## 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/mcp-router)

## Output

Returns a list of matching MCP servers or A2A tool descriptors relevant to the query, with token-compressed capability metadata, filtered through a Prompt-Guard firewall to block malicious or non-compliant entries.

## 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-dc6471b0/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)