# 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 to 500+ indexed MCP servers and A2A tools via a single connection, with 85% token compression and a built-in Prompt-Guard firewall.

## Facts

- Endpoint: POST https://json-repair.agentdiet.dev/v1/tool-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-18e02fe1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__PRcNjLZj-G5uA5xBBZbI

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-18e02fe1 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that handle 'company enrichment' or 'B2B lead data' and tell me which ones are available and what they do.

## When to prefer this

Choose this endpoint when an agent needs to discover, route to, or safely proxy any of 500+ MCP servers or A2A tools from a single connection, especially when token budget is limited (85% compression) or when prompt injection safety is a concern. Prefer over direct MCP server calls when the target tool is unknown and needs to be discovered dynamically, or when a firewall layer is required before invoking untrusted endpoints.

## Known failure modes

- Empty or overly broad query returns too many or irrelevant tool matches
- Queried capability not yet indexed returns empty result set
- Prompt-Guard firewall blocks a proxied endpoint flagged as unsafe, returning a rejection notice
- Payment not processed (HTTP 402) if x402 payment header is missing or malformed
- Timeout if the upstream MCP server being proxied is unresponsive

## 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/tool-broker)

## Output

Returns a structured object listing matched MCP servers or A2A tools relevant to the query, including endpoint metadata, capability summaries, and routing information. Responses are token-compressed by up to 85% and have passed through the Prompt-Guard firewall before delivery.

## 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-18e02fe1/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)