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

Searches and routes to 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt-injection firewall.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/universal-mcp-gateway?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-eac9fa4d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sSmuoabM0IWOQA6puJO3V

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 preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-eac9fa4d
```

Example prompt: Search your universal MCP gateway for tools that handle SEC filings and company enrichment — I want to find the best available endpoint for financial intelligence on public companies.

## When to prefer this

Choose this endpoint when your agent needs to dynamically discover or route to any of 500+ MCP/A2A tools without maintaining individual integrations, especially when token budget is a concern (85% compression) or when you need to validate external tool safety before connecting. Prefer it over direct MCP server connections when building agent swarms that need flexible, multi-tool routing from a single connection point.

## Known failure modes

- No tools found matching the query — returns empty result set or low-confidence matches
- Invalid or unsafe endpoint URL — firewall blocks and returns rejection signal
- Query too vague — returns broad or irrelevant tool matches
- Payment required (HTTP 402) if x402 micropayment header is missing or insufficient
- Upstream MCP server unreachable — partial results returned with error flags

## 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://preflight.agentdiet.dev/v1/universal-mcp-gateway)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the search query, including tool metadata, endpoint URLs, capability descriptions, and firewall-validated safety signals — all with up to 85% token compression applied to the response payload.

## 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/preflight-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-eac9fa4d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)