# 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 endpoint metadata through a single connection.

## Facts

- Endpoint: GET https://alpha-stream.agentdiet.dev/v1/b2a-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-36011499
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G6FEtt2E6xf98Q88hktn3

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-36011499
```

Example prompt: Search the MCP tool index for servers that handle SEC filings or financial document retrieval — I want to find what's available so I can route my agent there.

## When to prefer this

Choose this endpoint when you need to dynamically discover which MCP servers or A2A tools exist for a given capability, especially when you want a single connection that normalizes access to 500+ disparate tool providers. Prefer it over manually curating tool lists, or when you need safety-filtered (Prompt-Guard) results. Best when building meta-agents or swarm routers that need to select the right downstream tool at runtime.

## Known failure modes

- Empty results if query is too vague or no matching tools are indexed
- Generic object response schema means parsing may require defensive handling
- Tool index may not reflect real-time availability of upstream MCP servers
- Rate limiting or payment failure (HTTP 402) if x402 micropayment not supplied
- Query too short (minLength:1 enforced) or missing will return validation error

## 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/b2a-router)

## Output

Returns a structured object listing matching MCP servers or A2A tool endpoints relevant to the query, with metadata that has been compressed (85% token reduction) and filtered through a Prompt-Guard firewall for safety. Results include endpoint details, capability descriptions, and routing information.

## 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-36011499/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)