# 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 whale-momentum.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Searches and routes across 500+ indexed MCP servers and A2A tools, returning capability matches with token-compressed results and prompt-injection firewall protection.

## Facts

- Endpoint: GET https://whale-momentum.agentdiet.dev/v1/agent-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3f46bec4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_grKqPyvUuDLD-suI5pgMO

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 whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3f46bec4
```

Example prompt: Search the agent-router index for any MCP servers or A2A tools that handle SEC filings — I need to find the right capability to pull company financial disclosures.

## When to prefer this

Use this endpoint when an agent needs to dynamically discover which MCP server or A2A tool supports a given capability without maintaining its own index. Particularly valuable when building swarm architectures where agents must self-route to the right sub-tool, or when token budget is tight and compressed manifests are needed. Prefer over maintaining a static tool list when the ecosystem is evolving rapidly.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for obscure capability queries
- Firewall may reject queries that resemble prompt injection
- Rate limiting or payment required (HTTP 402) if call quota exceeded
- Timeout if upstream MCP 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://whale-momentum.agentdiet.dev/v1/agent-router)

## Output

Returns a list of matching MCP servers or A2A tool endpoints from the 500+ indexed catalog, with token-compressed capability descriptions (up to 85% compression) filtered through a Prompt-Guard firewall to block injection attacks.

## 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/whale-momentum-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-3f46bec4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)