# 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 2026-10-23).

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

## Facts

- Endpoint: POST https://json-repair.agentdiet.dev/v1/x402-broker?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-af0ec871
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oo2cumX0Oq3AZ5R5QDteY

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-af0ec871 -d '<json body>'
```

Example prompt: Search across all indexed MCP servers and A2A tools for anything that can do 'SEC filings' or 'company enrichment' — I want to see what's available and route my request to the best match.

## When to prefer this

Choose this endpoint when you need to discover which MCP server or A2A tool supports a specific capability without knowing in advance which provider to call — especially useful for agent orchestration layers that need dynamic tool routing across a heterogeneous index of 500+ servers. Prefer this over hardcoded tool calls when the required capability is unknown at design time or when token budget is a concern due to its 85% compression.

## Known failure modes

- Empty or too-short query returns no useful matches
- Query for an unsupported capability returns empty results with no fallback
- Prompt injection attempts in query are blocked by Prompt-Guard firewall, returning a rejection response
- Network timeout if upstream MCP servers are slow to respond
- Payment not processed (HTTP 402) if x402 credit is insufficient

## 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/x402-broker)

## Output

Returns a structured response listing matching MCP servers or A2A tools relevant to the search query, including endpoint references and capability summaries, delivered with up to 85% token compression through the meta-router's Prompt-Guard-filtered proxy layer.

## 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-af0ec871/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)