# 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 an index of 500+ MCP servers and A2A tools by capability query, returning matching endpoints with token-compressed results and Prompt-Guard firewall protection.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/universal-mcp-gateway?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-4b8de3dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JJhKZGQn4P4acj06fEp1q

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-4b8de3dc
```

Example prompt: Search the universal MCP gateway for tools that handle 'SEC filings' or 'company enrichment' and give me the best matching endpoints I can connect to.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A tools are available for a specific capability without knowing exact endpoints in advance. It is especially useful for building swarm agent architectures, dynamically routing tasks to the right tool, or verifying whether a known MCP URL meets compliance standards. Prefer this over direct tool calls when the right downstream tool is unknown.

## Known failure modes

- Empty or too-generic query returns low-relevance or no results
- Endpoint URL verification fails if the target is offline or non-compliant
- Prompt-Guard firewall may block queries detected as adversarial or injection attempts
- Rate limiting or payment failure (x402) if quota is exceeded
- Vague queries like 'tools' with no specificity return an overwhelming or unranked result set

## 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/universal-mcp-gateway)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, with metadata including endpoint URLs, capability descriptions, and token-compressed summaries. May also return SLA or compliance status if an endpoint URL is provided for verification.

## 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-4b8de3dc/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)