# 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 2026-10-28).

Indexes 500+ MCP servers and A2A tools, routing capability queries to the best matching tool with prompt-injection firewall protection and 85% token compression.

## Facts

- Endpoint: POST https://onchain-risk.agentdiet.dev/v1/b2b-osint-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-bb6fcdbf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2ewZQcRJscNyTOBm5Mcg8

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-bb6fcdbf -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for the best tool that can do SEC filings analysis — I want to find the right endpoint without connecting to 500 servers myself.

## When to prefer this

Choose this endpoint when an agent needs to discover or delegate to one of hundreds of MCP or A2A tools without maintaining individual connections to each. Ideal when you want a single API call to route to the best available tool for a given capability, especially with built-in prompt-injection protection and token compression already applied. Prefer it over manually curating a tool registry or connecting directly to dozens of MCP servers.

## Known failure modes

- No matching tool found for the query — returns empty or low-confidence result set
- Query too vague to route unambiguously — returns multiple candidates without a clear winner
- Indexed tool is offline or unreachable — proxy returns upstream timeout error
- Prompt-Guard firewall flags the query as suspicious — request blocked before routing
- Payment not completed (HTTP 402) — endpoint returns payment required before processing

## 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

Returns matched tool metadata, routed responses, or best-fit MCP/A2A endpoint details for the submitted capability query, delivered through a single proxied connection with token-compressed output and prompt-injection protection applied.

## 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-bb6fcdbf/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)