# 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).

Meta-router that discovers, validates, and proxies 500+ MCP servers and A2A tools via a single connection with token compression and prompt firewall protection.

## Facts

- Endpoint: POST https://alpha-stream.agentdiet.dev/v1/web-rag-shield-dag?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-79939d89
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_enaX4G1p5JnGusLjhE2eA

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-79939d89 -d '<json body>'
```

Example prompt: Can you search for MCP tools or A2A endpoints that handle 'context compression' — I want to find the best available options from your index of 500+ servers and see what comes back?

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding individual endpoints — especially useful for swarm orchestration, capability routing, or when the agent ecosystem is unknown and needs to be explored at runtime.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or very specific capability queries
- Firewall blocks suspicious or prompt-injection-containing queries
- Upstream MCP server index temporarily unavailable causing partial results
- Rate limiting or payment failure via x402 protocol

## 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/web-rag-shield-dag)

## Output

Returns matched tool metadata including endpoint URLs, capability descriptions, and token-compressed summaries of available MCP servers and A2A agents that match the query, filtered through a Prompt-Guard firewall for safety.

## 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-79939d89/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)