# 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 and returns a catalog of 500+ MCP servers and A2A tools indexed by capability, with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/broker/catalog?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-2fd84122
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vhxuokIWzHL4rVbMl9SVG

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-2fd84122
```

Example prompt: Search the MCP and A2A tool catalog for any servers that have 'company enrichment' capabilities — I want to see what's indexed and available.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability at runtime, rather than hardcoding tool endpoints. Especially useful for swarm routing, meta-agent orchestration, or when building adaptive pipelines that need to find the best available tool for a task from a large indexed catalog.

## Known failure modes

- Query string missing or empty — returns 400 Bad Request
- No matching tools found for the query — returns empty catalog result
- Payment not provided — returns HTTP 402 requiring x402 USDC payment
- Upstream MCP server index temporarily unavailable — returns 503
- Query triggers prompt-guard firewall — request blocked with security alert

## 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/broker/catalog)

## Output

Returns a catalog of matching MCP servers and A2A tools for the given capability query, including endpoint metadata, descriptions, and token-compressed summaries filtered through a Prompt-Guard firewall.

## 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-2fd84122/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)