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

Searches a meta-index of 500+ MCP servers and A2A tools by capability query, returning compressed tool descriptions with prompt-injection firewall protection.

## Facts

- Endpoint: GET https://domain-osint.agentdiet.dev/v1/b2a-router?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-21613de7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lShdShhjzc_InDc_XW5KO

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 domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-21613de7
```

Example prompt: Search the A2A and MCP swarm router for tools that handle SEC filings or company enrichment — I need to find which servers in the index support those capabilities.

## When to prefer this

Choose this endpoint when you need to discover which MCP servers or A2A agents support a given capability from a broad index of 500+ tools, especially when token efficiency matters or when you need firewall-protected routing. Prefer this over manual tool registries when you want a single connection that aggregates many providers.

## Known failure modes

- Empty result set if query is too niche or no indexed tools match
- Malformed query string returns 400 Bad Request
- Service unavailable or timeout if the meta-index backend is down
- Prompt-Guard firewall may block or sanitize queries that resemble injection attempts
- Payment required (HTTP 402) if x402 micropayment header is missing or invalid

## 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://domain-osint.agentdiet.dev/v1/b2a-router)

## Output

Returns a compressed list of matching MCP servers or A2A tool entries relevant to the query, including tool names, capability summaries, and endpoint references, with 85% token compression applied and prompt-injection filtered output.

## 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/domain-osint-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-21613de7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)