# Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (B2B Lead Enrichment Workflow)

> Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router (B2B Lead Enrichment Workflow) 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 for agent routing and tool discovery.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/workflows/b2b-lead-enrichment?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-26e1043a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RULd9W4hjCMFBiDWkPnWP

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-26e1043a
```

Example prompt: Search the MCP and A2A tool index for any servers that handle 'company enrichment' or 'B2B lead data' — I want to find the best tool my agent can route to for enriching a list of business contacts.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool can handle a specific capability at runtime, especially when the agent ecosystem is large and you want a single connection point with built-in token compression and prompt security filtering rather than hardcoding individual tool URLs.

## Known failure modes

- Empty query string returns validation error (minLength:1 not met)
- Query too vague returns low-relevance or no matches
- Endpoint URL verification returns not-found if URL is not indexed
- Upstream MCP index unavailability causes 5xx response
- Payment not processed (x402) blocks access entirely

## 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/workflows/b2b-lead-enrichment)

## Output

Returns a compressed, Prompt-Guard-filtered list of matching MCP servers and A2A tools from a 500+ entry index, including endpoint metadata, capability descriptions, and routing information relevant to the search query or verified URL.

## 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-26e1043a/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)