# 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 2026-10-21).

Searches a meta-index of 500+ MCP servers and A2A tools by capability keyword or URL, returning matching endpoints with token-compressed results and Prompt-Guard firewall protection.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/api/mcp/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-03945b3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vBSyMtKGrgARcp7Hl7z46

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-03945b3d
```

Example prompt: Search the MCP tool index for any servers that handle context compression or token reduction — I want to find the best available tool for shrinking prompts before sending them to a model.

## When to prefer this

Use this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to delegate a subtask to, rather than hardcoding a tool. Ideal for swarm architectures, meta-agents, or orchestration layers that need runtime tool routing across a broad index of 500+ services. Prefer this over manually curating a tool registry or calling individual service directories.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or misspelled capability queries
- Endpoint URL verification returns non-compliant if target is offline or non-standard
- Token compression may strip nuanced metadata for complex tool descriptions
- Rate limiting or payment failure (HTTP 402) if x402 payment is not attached

## 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/api/mcp/audit)

## Output

Returns a token-compressed list of matching MCP servers or A2A tools relevant to the capability query, including endpoint metadata, compliance status, and routing information. Results are filtered through a Prompt-Guard firewall to block malicious payloads.

## 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-03945b3d/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)