# 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 a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed, firewall-filtered tool matches via a single connection.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/agent-router?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-fda1231e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LcsZkQecDUYmq1MbcRPyU

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-fda1231e -d '<json body>'
```

Example prompt: Search the agent tool index for any MCP servers or A2A tools that handle SEC filings or company enrichment, and give me the best matches with compressed metadata.

## When to prefer this

Choose this endpoint when an AI agent or swarm needs to dynamically discover which MCP server or A2A tool to delegate a subtask to, especially when you don't know ahead of time what tools are available. It is preferable to hardcoding tool lists, and is ideal for multi-agent orchestration, capability gap detection, and safe proxying through a Prompt-Guard firewall.

## Known failure modes

- Empty or vague query returns no useful matches
- Endpoint URL verification fails if the URL is not indexed
- Payment not completed via x402 results in 402 response blocking access
- Overly broad query returns too many low-relevance results
- Prompt-Guard firewall may block queries containing injection-like patterns

## 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/agent-router)

## Output

Returns a compressed (up to 85% token reduction), firewall-screened list of matching MCP servers or A2A tools from a 500+ item index, including tool metadata, capability descriptions, and routing information relevant to the input query.

## 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-fda1231e/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)