# 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).

Meta-router that searches 500+ indexed MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed results and Prompt-Guard firewall protection.

## Facts

- Endpoint: POST https://json-repair.agentdiet.dev/v1/crypto-alpha-dag?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-a664ecb4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rBI3P6FwWAnIc2Tvd86Pv

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-a664ecb4 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any available servers that handle SEC filings or financial data extraction — I want to know what's out there before I build my pipeline.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can fulfill a specific capability at runtime, rather than hardcoding tool URLs. Ideal for swarm orchestrators, meta-agents, or pipelines that need to route tasks to the best available tool without prior knowledge of the full tool registry. Prefer this over direct tool calls when the right downstream service is unknown.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query too broad returns low-relevance tool listings
- Indexed MCP server is offline or unreachable at routing time
- Payment not processed (HTTP 402) due to missing x402 credentials
- Prompt-Guard firewall blocks query flagged as adversarial input
- Network timeout when querying large swarms of downstream servers

## 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/crypto-alpha-dag)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the capability query, with token-compressed metadata (85% compression), endpoint URLs, capability summaries, and Prompt-Guard firewall validation status. Response is a generic JSON object containing ranked tool matches.

## 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-a664ecb4/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)