# 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 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://alpha-stream.agentdiet.dev/v1/a2a-mesh?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-f5ca5aa4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_44YrbGwJqM96Pu6eSk_pG

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-f5ca5aa4
```

Example prompt: Search the MCP and A2A tool index for anything that handles SEC filings or company enrichment — I need to find the best available endpoint for that capability.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can handle a given capability at runtime, rather than hardcoding tool URLs. Especially useful when building swarm agents that need to self-route to the right tool, or when you want a single firewall-protected proxy layer across hundreds of external MCP endpoints instead of managing connections individually.

## Known failure modes

- Empty query string returns validation error (minLength:1 required)
- No matching tools found for obscure or misspelled capability queries
- Firewall blocks results if query triggers Prompt-Guard rules
- Index may be stale if a listed MCP server has gone offline
- HTTP 402 payment required if x402 payment header is missing or invalid
- Generic object response schema means result structure may vary without strong typing guarantees

## 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-mesh)

## Output

Returns a compressed (up to 85% token reduction) list of matching MCP servers and A2A tools from the 500+ endpoint index, filtered through a Prompt-Guard firewall, with metadata about each matching capability including endpoint details and relevance to the query.

## 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-f5ca5aa4/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)