# 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 serp-extract.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-23).

Searches and routes queries across 500+ indexed MCP servers and A2A tools with token-compressed results and a Prompt-Guard firewall

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/b2b-osint-dag?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-8c684161
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D9Vv5dYx8nuokMivO4Bdl

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 serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-8c684161 -d '<json body>'
```

Example prompt: Search across all available MCP servers and A2A tools to find the best capability for 'company enrichment' — show me what's indexed and give me the top matches with compressed descriptions.

## When to prefer this

Use this endpoint when an AI agent or swarm needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding tool references. Ideal for orchestration layers, swarm routers, or agents that need to self-configure their toolchain at runtime. Prefer this over manual tool directories when you need 85% token-compressed responses and built-in prompt injection protection.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure capability queries
- Prompt-Guard firewall blocks adversarial or injection-style queries
- Payment not processed (x402 payment required before results returned)
- Timeout if meta-router backend index is temporarily unavailable

## 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://serp-extract.agentdiet.dev/v1/b2b-osint-dag)

## Output

Returns a token-compressed list of matching MCP servers and A2A tools from an index of 500+, including endpoint metadata, capability descriptions, and routing information, filtered through a 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/serp-extract-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-8c684161/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)