# 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 whale-momentum.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 compressed, firewall-filtered results via a single meta-router connection

## Facts

- Endpoint: GET https://whale-momentum.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: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-5392f1d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fQj3j2PzhHs7_ibFzbOxz

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 whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-5392f1d9
```

Example prompt: Search the A2A and MCP tool index for any servers that support 'SEC filings' so I can figure out which tool to route my financial data request through.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to delegate a capability to, especially when the agent doesn't know which specific tool handles a given task. It is particularly useful in multi-agent swarm architectures where routing decisions must be made at runtime. Prefer this over hardcoding individual MCP server URLs when the tool landscape is large or frequently changing.

## Known failure modes

- Empty or vague query returns no meaningful matches
- Query matches too many tools, returning an overly broad or unhelpful result set
- Prompt-Guard firewall blocks a legitimate query if it resembles a prompt injection
- The indexed tool catalog may be stale if a particular MCP server has gone offline
- Payment (x402) not satisfied results in HTTP 402 blocking the response
- Endpoint URL verification may return false compliance if the remote server is intermittently available

## 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://whale-momentum.agentdiet.dev/v1/a2a-router)

## Output

Returns a filtered, token-compressed list of matching MCP servers and A2A tool entries relevant to the capability query, processed through a Prompt-Guard firewall to remove potentially malicious content, delivered in a compact format with roughly 85% token reduction compared to raw index results.

## 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/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-5392f1d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)