# 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 and routes queries across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt firewall protection

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/b2b-osint-dag?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-0b14bcb2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_460sDBUw4rHGKi_Q-WVum

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-0b14bcb2
```

Example prompt: Search the MCP and A2A tool index for servers that handle 'context compression' — I want to see what's available so I can route my agent there without setting up multiple connections.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding individual tool URLs. It is especially valuable in swarm or multi-agent architectures where a single routing layer with 85% token compression and built-in prompt safety is preferred over maintaining dozens of separate tool connections.

## Known failure modes

- Empty query string returns validation error (minLength:1)
- Query with no matching tools returns empty results set
- Endpoint URL verification for non-indexed URLs may return not-found
- Firewall may block or flag queries containing prompt-injection patterns
- Service unavailability or upstream MCP server timeouts may degrade results

## 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/b2b-osint-dag)

## Output

A structured response listing matched MCP servers or A2A tools relevant to the query, with metadata such as endpoint URLs, capability descriptions, token-compressed summaries, and any firewall/safety flags applied by the Prompt-Guard layer.

## 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-0b14bcb2/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)