# 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 2026-10-28).

Searches and routes queries across 500+ indexed 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/mcp-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-28
- 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-50ea0f60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1B9N_KpKuCSNJz0dOVuB-

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-50ea0f60 -d '<json body>'
```

Example prompt: Search for MCP tools that can do SEC filings lookup and route my query through the safe-proxy so I get compressed, injection-free results.

## When to prefer this

Choose this endpoint when you need a single-connection entry point to discover, search, and route across a large index of MCP servers and A2A tools — especially when token budget is a concern (85% compression) or when you need firewall protection against prompt injection in tool responses. Prefer over manually enumerating individual MCP endpoints or building your own tool registry.

## Known failure modes

- Empty or vague query returns low-relevance or no matches
- Queried capability not indexed among the 500+ tools returns empty result
- Prompt-guard firewall may flag and block certain query patterns as injection attempts
- Upstream MCP server unavailability causes routing failure
- Payment not processed (HTTP 402) blocks execution

## 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/mcp-router)

## Output

Returns matched MCP servers or A2A tools relevant to the query, with up to 85% token-compressed responses and prompt-injection-filtered results, surfacing endpoint URLs, capability descriptions, and routing metadata.

## 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-50ea0f60/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)