# 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 to 500+ MCP servers and A2A tools via a single meta-router endpoint with token compression and prompt injection firewall.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/workflows/execute?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-e2d6ba16
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GsvXYrZ2xtv25evJ5HNAo

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-e2d6ba16 -d '<json body>'
```

Example prompt: Search the MCP tool index for any servers that support 'context compression' or 'SEC filings' — I need to find the best available agent tool for that capability.

## When to prefer this

Choose this endpoint when you need a single connection point to discover and route across 500+ heterogeneous MCP servers and A2A tools without managing individual integrations. Ideal for agent orchestrators building swarms that need to dynamically find the right tool at runtime. The built-in Prompt-Guard firewall makes it preferable over raw tool registries when security against prompt injection is a concern. The 85% token compression is especially valuable when running many discovery queries in a token-constrained context.

## Known failure modes

- Empty query string returns validation error (minLength:1 constraint)
- No matching tools found for obscure or misspelled capability queries
- Prompt-Guard firewall may block queries containing injection-like patterns
- Upstream MCP server index unavailability causes degraded or empty results
- Payment failure via x402 results in 402 response before execution

## 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/workflows/execute)

## Output

Returns a compressed, token-pruned list of matched MCP servers or A2A tool endpoints relevant to the query, filtered through a Prompt-Guard firewall. Results include tool names, capability descriptions, and routing metadata — reduced by up to 85% in token footprint compared to raw discovery responses.

## 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-e2d6ba16/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)