# 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 to 500+ MCP servers and A2A tools via a single connection, with token compression and prompt-injection firewall

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/a2a-router?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-65af7fc8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EnMWh1reKiJ14gFfNJ5qX

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-65af7fc8
```

Example prompt: Search the A2A and MCP tool index for anything that can handle SEC filings or company enrichment, and route me to the best matching endpoint.

## When to prefer this

Choose this endpoint when an agent needs to discover or route to unfamiliar MCP servers or A2A tools without managing individual connections, especially when token budget is a concern (85% compression) or when prompt-injection safety is required. Prefer over direct tool invocation when the right endpoint is unknown and needs to be searched first.

## Known failure modes

- Empty or vague query returns no meaningful results
- Queried capability not indexed in the 500+ server registry
- Endpoint URL verification returns invalid or unreachable status
- Token compression artifacts may reduce fidelity of metadata
- Rate limiting or payment failure via x402 if USDC balance is insufficient

## 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/a2a-router)

## Output

Returns a list of matching MCP servers or A2A tools from a 500+ item index, with compressed metadata about each capability, endpoint URLs, and routing information, filtered through a Prompt-Guard firewall for safety.

## 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-65af7fc8/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)