# 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 meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed tool listings routed through a Prompt-Guard firewall.

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/v1/agent-tool-marketplace?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-7afeea50
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mY-VgWAKzHdbguFOV8VFv

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-7afeea50
```

Example prompt: Search the agent tool marketplace for MCP servers or A2A tools that handle 'github security' — I want to find what's available with token-compressed results.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover available MCP servers or A2A tools by capability at runtime, rather than hardcoding tool integrations. Especially useful when you want a single-connection meta-router that handles safe-proxying and token compression across a broad catalog of 500+ tools.

## Known failure modes

- Query too vague returns no meaningful matches
- Endpoint URL verification returns inconclusive result if URL is not indexed
- Payment not processed (x402 flow fails) results in 402 error with no results
- Rate limiting or quota exceeded returns error
- Firewall (Prompt-Guard) blocks a query deemed unsafe

## 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/agent-tool-marketplace)

## Output

Returns a compressed listing of matching MCP servers and A2A tools from the 500+ indexed catalog, with capability metadata, filtered through the Prompt-Guard firewall. Results use 85% token compression to minimize context overhead.

## 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-7afeea50/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)