# 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 2026-10-23).

Searches and indexes 500+ MCP servers and A2A agent tools by capability query, returning token-compressed results with prompt-injection firewall protection.

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/v1/mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-eb18200d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ymMsm2_2YspHZ8ijqG99j

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-eb18200d
```

Example prompt: Search the MCP tool index for servers that handle 'company enrichment' and return the top 10 results — I want to find agent-compatible endpoints I can plug into my pipeline.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover MCP-compatible or A2A-compatible tools at runtime without pre-configuring dozens of individual connections. Ideal for swarm orchestrators, agent pipelines, or meta-agents that need to find the right capability on demand. Preferable over hard-coding individual MCP server URLs when the tool landscape is evolving or unknown.

## Known failure modes

- Empty query string returns validation error
- Query matching no indexed tools returns empty results list
- Cursor from a previous session may be stale and return 404 or empty page
- Rate limiting or payment failure (x402) if micropayment not resolved
- Limit value out of range (>100 or <1) returns 400 bad request

## 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-gateway)

## Output

A paginated JSON object listing matching MCP servers and A2A tools, including endpoint metadata, capability descriptions, and relevance-ranked results, compressed with up to 85% token reduction. Includes an opaque cursor for fetching additional pages.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "query": {
   "type": "string",
   "minLength": 1,
   "description": "Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## 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-eb18200d/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)