# 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 proxies 500+ MCP servers and A2A tools through a single connection with token compression and prompt-injection firewall

## Facts

- Endpoint: POST https://defi-yield.agentdiet.dev/v1/universal-mcp-gateway?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-796ef338
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yVhAd_wza3AAG9bgf_6H1

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-796ef338 -d '<json body>'
```

Example prompt: Search the MCP tool registry for any servers that handle 'SEC filings' or 'company enrichment' — I want to find and route to the right tool from a single connection without blowing up my token budget.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover and route to the right MCP server or A2A tool at runtime without hardcoding individual endpoints. It is especially useful when token budget is constrained (85% compression), when you need a single connection to access 500+ tools, or when untrusted tool responses need to pass through a prompt-injection firewall before being consumed by the agent.

## Known failure modes

- No matching tools found for the given query — returns empty result set
- Query string too vague or generic — low-confidence matches returned
- Endpoint URL verification fails if an invalid URL is passed as query
- Upstream MCP server is offline — router may return degraded or cached result
- Rate limit exceeded — 402 payment required error if credits exhausted

## 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/universal-mcp-gateway)

## Output

Returns matched MCP server or A2A tool records relevant to the query, with 85% token-compressed summaries of capabilities and connection details, filtered through a Prompt-Guard firewall to block injected malicious content before returning results to the agent.

## 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-796ef338/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)