# 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 alpha-stream.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered routing results for agent orchestration.

## Facts

- Endpoint: GET https://alpha-stream.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: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9bac13f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MqpzPTfU83FnsVRkUhuQx

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 alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9bac13f2
```

Example prompt: Search the A2A and MCP tool index for 'SEC filings' — I want to find which servers or tools can handle that capability so I can route my agent to the right one.

## When to prefer this

Use this endpoint when an agent needs to dynamically discover which MCP server or A2A tool supports a given capability across a broad ecosystem (500+ servers) rather than hardcoding tool URLs. Prefer it over manual tool registries when you need compressed, firewall-sanitized results and want a single connection point for swarm routing.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or narrow capability queries
- Endpoint URL verification may return unreachable or non-compliant status for invalid URLs
- Rate limiting or payment failure (HTTP 402) if x402 payment is not provided
- Downstream MCP index may be stale or incomplete for newly published servers

## 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://alpha-stream.agentdiet.dev/v1/a2a-router)

## Output

A compressed (up to 85% token reduction) list of matching MCP servers or A2A tool records relevant to the query, including endpoint metadata, capability tags, and routing hints, filtered through a 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/alpha-stream-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9bac13f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)