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

Searches and routes queries across 500+ indexed MCP servers and A2A tools via a single connection, with token compression and prompt firewall protection.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/bundle-execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-aed9fe13
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-7zYN8PbEafK2HOOxT0ii

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 defi-yield-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-aed9fe13
```

Example prompt: Can you search the MCP tool index for anything that handles SEC filings or company enrichment — I need to find the right tool to route my request through?

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding a specific tool. It is especially useful for swarm architectures, multi-agent pipelines, or when the appropriate downstream tool is unknown at build time. It also doubles as a compliance verifier for arbitrary agent endpoint URLs.

## Known failure modes

- Empty or vague query returns low-confidence or empty result set
- Queried endpoint URL is unreachable or non-compliant, returning an error or null verification result
- Service unavailable if the meta-router index is stale or offline
- Payment not processed (HTTP 402) if x402 micropayment header is missing or malformed
- Rate limiting if too many queries are made in a short window

## 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://defi-yield.agentdiet.dev/v1/bundle-execute)

## Output

Returns a list of matched MCP servers or A2A tools relevant to the query, including metadata such as tool names, capabilities, endpoint URLs, and token-compressed descriptions. May also return compliance or verification details when an endpoint URL is supplied as 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/defi-yield-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-aed9fe13/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)