# 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 injection protection

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/swarm-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-2c670788
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H7MKhNZlIvXygjSuaASJa

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-2c670788
```

Example prompt: Search the swarm router for MCP tools or A2A agents that can handle SEC filings — query 'sec filings' and tell me what tools come back.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP servers or A2A tools support a given capability without maintaining its own registry. Ideal for multi-agent orchestration scenarios where the right downstream tool is unknown at design time, or when you want a single proxied entry point rather than managing 500+ separate connections.

## Known failure modes

- Missing or empty query parameter returns validation error
- No matching tools found for obscure or misspelled capability query
- Endpoint URL verification returns timeout if remote MCP server is unreachable
- Payment not completed via x402 results in HTTP 402 response blocking access
- Overly broad query returns too many low-relevance results

## 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/swarm-execute)

## Output

Returns a list of matching MCP servers or A2A tools relevant to the capability query, including tool metadata and routing information, compressed to reduce token usage. May also verify an endpoint URL for compliance if a URL is passed 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-2c670788/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)