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

Searches an index of 500+ MCP servers and A2A tools by capability query, returning compressed tool metadata through a prompt-guard firewall

## Facts

- Endpoint: POST https://token-intel.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: token-intel.agentdiet.dev
- Website: https://token-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-55388237
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y7c1juXRERdISBMr3KwRJ

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 token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-55388237 -d '<json body>'
```

Example prompt: Search for MCP servers and A2A tools that can handle SEC filings and company enrichment — I need to find which tools in the 500-server index support those capabilities.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover and route to MCP servers or A2A tools at runtime without hardcoding individual tool URLs. It is especially valuable for swarm orchestration, tool-augmented agents, or when you want token-efficient tool metadata with built-in prompt injection protection. Prefer this over manually curating tool lists or querying individual MCP registries.

## Known failure modes

- Empty query string returns validation error (minLength:1 enforced)
- No matching tools found for obscure or misspelled capability query
- Prompt-Guard firewall may block queries containing injection patterns
- Payment required (HTTP 402) if x402 credentials are missing or invalid
- Idempotency-Key collision may cause cached responses on retries

## 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://token-intel.agentdiet.dev/v1/b2b-osint-dag)

## Output

Returns a compressed (up to 85% token reduction) list of matching MCP servers or A2A tools relevant to the query, including their endpoint metadata, capability descriptions, and routing information — filtered through a Prompt-Guard firewall for safe use in agent pipelines.

## 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/token-intel-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-proxy-55388237/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from token-intel.agentdiet.dev](https://www.zero.xyz/host/token-intel.agentdiet.dev/llms.txt)