# 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 2026-10-23).

Searches and routes across 500+ indexed MCP servers and A2A tools using a single connection, with built-in token compression and prompt-injection firewall.

## Facts

- Endpoint: POST https://alpha-stream.agentdiet.dev/api/mcp/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-4a6cee5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vpvd1KsjJq4daFgCLdz6y

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-4a6cee5e -d '<json body>'
```

Example prompt: Search across the 500+ indexed MCP servers and A2A tools to find me the best capability for 'SEC filings financial intelligence' — use the safe-proxy firewall and return compressed results.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool best handles a specific capability, rather than hardcoding a single tool. Especially useful when building swarms or multi-agent pipelines that need to route tasks to the right specialized tool at runtime. The built-in Prompt-Guard firewall makes it preferable over direct tool proxying when safety and injection resistance are required.

## Known failure modes

- Empty query string returns a validation error
- Overly broad queries may return low-relevance results from the 500+ index
- Prompt-Guard firewall may flag and block queries containing injection-like patterns
- External MCP server downtime may result in incomplete index coverage
- Rate limiting or payment failures may block access under x402 flow

## 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/api/mcp/audit)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the query, along with tool metadata, with results compressed by up to 85% for token efficiency and filtered through a Prompt-Guard firewall to block injection attacks.

## 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-4a6cee5e/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)