# 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 2026-10-23).

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

## Facts

- Endpoint: POST https://defi-yield.agentdiet.dev/v1/bundle-execute?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-e5f4b51f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K8llmjTw-BUgsLfvHfTe2

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-e5f4b51f -d '<json body>'
```

Example prompt: Search across all connected MCP servers and A2A tools to find something that can do B2B lead enrichment — route me to the best match and give me a compressed response.

## When to prefer this

Choose this endpoint when an AI agent needs to discover and access dozens of MCP or A2A tools without managing individual connections, especially when token budget is constrained or prompt-injection safety is required. It is ideal for swarm-style multi-agent architectures needing a single unified gateway to a broad tool ecosystem.

## Known failure modes

- No matching tool found for the given query (empty results)
- Query string too vague or too short to resolve a specific tool
- Downstream MCP server unavailable causing partial results
- Prompt-Guard firewall blocks a query flagged as injection attempt
- Payment not processed correctly via x402, resulting in 402 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/bundle-execute)

## Output

Returns matching MCP servers or A2A tools for the given capability query, including routing metadata, endpoint references, and token-compressed responses passed through a prompt-injection firewall.

## 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-e5f4b51f/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)