# 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, firewall-filtered results via a single connection

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/b2b-osint-dag?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-7df8c6bc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ji_Mogey3ez7b3L0rn_lU

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-7df8c6bc
```

Example prompt: Search the MCP and A2A tool index for anything that can do company enrichment or B2B lead data — I want to see what's available with a single query.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools are available for a given capability without hardcoding specific tool URLs. Particularly useful for swarm orchestration, capability routing, or when building an agent that needs to self-select tools at runtime. Prefer over manual tool directories when token efficiency and prompt-injection safety are priorities.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure or very narrow capability queries
- Endpoint URL verification may return inconclusive results for unlisted endpoints
- Service unavailability may return HTTP 402 or 5xx if payment or upstream index is unreachable

## 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/b2b-osint-dag)

## Output

Returns a structured object listing matched MCP servers and A2A tools relevant to the capability query, with compressed metadata (85% token reduction) and Prompt-Guard firewall filtering applied. Includes tool names, descriptions, endpoint URLs, and relevance signals.

## 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-7df8c6bc/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)