# 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 compressed, firewall-filtered results via a single connection

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/x402-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-3b1f73a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mvpdwRpxVvz-vlo0p-Cd1

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-3b1f73a1
```

Example prompt: Search the A2A and MCP tool index for any servers or agents that handle SEC filings and company enrichment — I want to know what tools are available and how to connect to them.

## When to prefer this

Choose this endpoint when you need to discover which of 500+ MCP servers or A2A tools supports a specific capability without individually querying each one, especially when token efficiency matters and you want a built-in prompt-injection firewall on returned tool metadata.

## Known failure modes

- Missing required 'query' parameter returns a validation error
- Empty or overly broad queries may return too many or zero results
- Unknown or unindexed endpoint URLs return no match
- Payment not settled (x402) results in 402 response blocking access
- Network timeouts if upstream MCP servers are unreachable

## 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-gateway)

## Output

A filtered, token-compressed list of matching MCP servers or A2A tool endpoints relevant to the query, along with capability descriptions and routing metadata, passed through a Prompt-Guard firewall for safety.

## 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-3b1f73a1/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)