# 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 onchain-risk.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 to discover, route, and safely proxy agent capabilities with built-in prompt-injection firewall and token compression.

## Facts

- Endpoint: POST https://onchain-risk.agentdiet.dev/api/mcp/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9b86761a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VDysRhMU3LmvcP2ntZnyx

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 onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9b86761a -d '<json body>'
```

Example prompt: Search the MCP and A2A tool index for any servers that handle SEC filings or company enrichment, and route me to the best match.

## When to prefer this

Choose this endpoint when an AI agent needs to dynamically discover which MCP server or A2A tool to call for a given capability, rather than hardcoding a specific tool. Ideal for swarm architectures where the orchestrator must route tasks to the right specialist agent at runtime. Prefer over manual tool registries when you need built-in prompt-injection safety on discovered tools and token-budget-aware results.

## Known failure modes

- Empty query string returns validation error
- No matching tools found for niche query — returns empty result set
- Upstream MCP server temporarily unavailable — partial results returned
- Payment not completed (HTTP 402) blocks access
- Invalid endpoint URL when using URL-verify mode returns compliance error

## 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://onchain-risk.agentdiet.dev/api/mcp/audit)

## Output

Returns a list of matching MCP servers or A2A tool endpoints from the 500+ item index, ranked by relevance to the query, with capability metadata, routing details, and token-compressed summaries. Includes Prompt-Guard firewall screening on returned payloads.

## 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/onchain-risk-agentdiet-dev-universal-a2a-mcp-tool-discovery-safe-9b86761a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)