# 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 onchain-risk.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

Searches and routes to 500+ MCP servers and A2A tools via a single meta-router connection with token compression and prompt-injection firewall.

## Facts

- Endpoint: POST https://onchain-risk.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: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3903b7e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MHfp02Xd66fukimkQilF4

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 onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3903b7e5 -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for something that can do SEC filings or company enrichment — I want to find and route to the right tool without setting up multiple connections.

## When to prefer this

Choose this endpoint when you need to discover, evaluate, or route to any of 500+ MCP/A2A tools without maintaining separate connections to each — especially useful when you don't know which specific tool to use, want token-compressed responses, or need prompt-injection protection on tool outputs. Prefer alternatives when you already know the exact MCP server URL and want to call it directly without an intermediary.

## Known failure modes

- No matching tool found for the given query — returns empty results or low-confidence matches
- Query too vague to disambiguate between multiple tool categories
- Upstream MCP server unavailable — proxy call fails with timeout or connectivity error
- Payment required (HTTP 402) if x402 micropayment header not included
- Prompt-injection firewall blocks a legitimate query that resembles an attack pattern

## 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://onchain-risk.agentdiet.dev/v1/crypto-alpha-dag)

## Output

A list of matching MCP servers or A2A tools relevant to the query, with routing metadata; when acting as a proxy, returns the compressed (up to 85% token reduction) response from the matched tool, filtered through a prompt-injection 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/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3903b7e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)