# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, safe-proxied tool references for agent orchestration

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/tool-search?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-03d48716
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6X7QdHH18yQZMbJI48Wr0

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-03d48716
```

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 tool to connect my agent to.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability, rather than hard-coding tool endpoints. Ideal for swarm orchestration scenarios where the right tool is not known in advance, or when you need a safe-proxied, token-compressed single-connection interface to hundreds of tools at once.

## Known failure modes

- Empty result set if the query matches no indexed tools
- Query too vague or broad may return low-relevance results
- Endpoint URL verification may fail if the remote server is offline
- Payment required (HTTP 402) if x402 micropayment header is missing or insufficient
- Malformed query string returns 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://defi-yield.agentdiet.dev/v1/tool-search)

## Output

Returns a list of matching MCP servers or A2A tool entries relevant to the capability query, with compressed metadata (85% token reduction) and Prompt-Guard firewall filtering applied, indicating which tools are available, their endpoints, and their capabilities.

## 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-03d48716/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)