# 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 2026-10-21).

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

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/a2a-mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-17d53e9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dbx13Ia7x-jm23yDdtaJm

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-17d53e9b
```

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

## When to prefer this

Use this endpoint when an agent needs to dynamically discover which MCP servers or A2A tools can fulfill a capability at runtime, rather than hardcoding tool endpoints. Ideal for swarm orchestration, meta-routing across heterogeneous tool ecosystems, and when token budget is constrained (85% compression). Prefer over manual tool registries when breadth of coverage (500+ servers) matters.

## Known failure modes

- Empty query string returns validation error
- No matching tools found returns empty result set
- Prompt injection attempt blocked by Prompt-Guard firewall
- x402 payment required if micropayment not settled
- Indexed server may be stale or offline if index is not current
- Overly broad query returns too many low-relevance results

## 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/v1/a2a-mesh)

## Output

Returns a list of matching MCP server endpoints or A2A tool descriptors from the 500+ indexed registry, with 85% token-compressed manifests and Prompt-Guard firewall screening applied. Each result includes routing metadata and capability summaries for the matching tools.

## 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-17d53e9b/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)