# 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 json-repair.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 token-compressed results through a Prompt-Guard firewall proxy.

## Facts

- Endpoint: GET https://json-repair.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: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f9bb8dd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e8gUbBRUnFSD1P9pktZ7b

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 json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f9bb8dd1
```

Example prompt: Can you search the universal MCP gateway for tools that handle SEC filings and context compression, and show me what's available?

## When to prefer this

Use this endpoint when an AI agent needs to discover which MCP-compatible tools or A2A agents are available for a given capability without hardcoding individual server URLs. Prefer it over manually enumerating MCP servers when you need token-efficient, firewall-protected access to a broad index of 500+ tools in a single connection.

## Known failure modes

- No matching tools found for the given query — returns empty result set
- Query string too vague to narrow results meaningfully
- Endpoint URL provided for verification is not in the index
- Prompt-Guard firewall blocks or sanitizes a query flagged as unsafe
- Payment not processed (HTTP 402) — call requires $0.01 USDC via x402
- Rate limiting or gateway timeout on upstream MCP server resolution

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

## Output

A token-compressed list of matching MCP servers or A2A tool entries relevant to the query, filtered through the Prompt-Guard firewall, with metadata about each indexed endpoint including capability description and connection details.

## 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/json-repair-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-f9bb8dd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)