# B2B Lead Enrichment via A2A & MCP Tool Discovery Router

> B2B Lead Enrichment via A2A & MCP Tool Discovery Router is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches an index of 500+ MCP servers and A2A tools to discover, route, and proxy capabilities matching a given query, with token-compressed results filtered through a Prompt-Guard firewall — served at a B2B lead enrichment workflow endpoint.

## Facts

- Endpoint: GET https://prompt-guard.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: prompt-guard.agentdiet.dev
- Website: https://prompt-guard.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/prompt-guard-agentdiet-dev-b2b-lead-enrichment-via-a2a-mcp-tool-1ed780b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nYgwETeo0rlw0S4voqbA_

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 prompt-guard-agentdiet-dev-b2b-lead-enrichment-via-a2a-mcp-tool-1ed780b8
```

Example prompt: Search the MCP and A2A tool index for capabilities related to 'B2B lead enrichment' and tell me which tools or servers are available to enrich company contact data.

## When to prefer this

Choose this endpoint when an agent needs to dynamically discover which of 500+ MCP servers or A2A tools can handle a given capability, rather than hard-coding a specific tool. Ideal for meta-orchestration, swarm routing, and situations where the right downstream tool is unknown at design time. Prefer over manual tool registries when token efficiency and built-in prompt safety filtering are required.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for niche or misspelled query returns empty result set
- Firewall blocks a query flagged as prompt injection attempt
- Upstream MCP server index temporarily unavailable returns 5xx
- x402 payment failure if USDC balance insufficient for $0.01 per-call fee

## 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://prompt-guard.agentdiet.dev/v1/workflows/b2b-lead-enrichment)

## Output

A token-compressed list of matching MCP server entries and A2A tool endpoints relevant to the query, including capability metadata such as endpoint URLs, tool names, and routing recommendations, all filtered through the Prompt-Guard firewall for safety.

## 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/prompt-guard-agentdiet-dev-b2b-lead-enrichment-via-a2a-mcp-tool-1ed780b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prompt-guard.agentdiet.dev](https://www.zero.xyz/host/prompt-guard.agentdiet.dev/llms.txt)