# 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 catalog of 500+ MCP servers and A2A tools by capability query, returning compressed tool metadata with prompt-injection firewall protection

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/broker/catalog?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-aa8ba8ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mtYXR0KmeVLN2eJOEWhbp

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-aa8ba8ad
```

Example prompt: Search the MCP and A2A tool catalog for anything that does SEC filings or company enrichment — I want to see what agents are available and what capabilities they expose.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability, rather than hard-coding tool integrations. It is especially valuable for swarm orchestration scenarios, token-budget-sensitive agents (85% compression), or when you need to verify whether a known endpoint URL is indexed and compliant.

## Known failure modes

- Missing or empty query parameter returns validation error
- Query matches no tools in catalog — empty result set returned
- Downstream MCP server unavailable — partial or degraded catalog results
- Payment not processed (HTTP 402) — endpoint requires $0.01 USDC per call via x402
- Prompt injection detected by firewall — request blocked with security alert

## 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/broker/catalog)

## Output

A compressed catalog response listing matching MCP servers and A2A tool endpoints, including their capabilities, descriptions, and routing metadata — with up to 85% token reduction applied and prompt-injection threats filtered by the Prompt-Guard 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-aa8ba8ad/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)