# A2A Agent Discovery Manifest & Live Status

> A2A Agent Discovery Manifest & Live Status is a paid API for AI agents from assay.agentdiet.dev, paid per call via MPP, $0.005000/call, status unknown (last checked 2026-10-23).

Returns the A2A agent discovery manifest and live operational status for a given A2A/MCP/x402 endpoint URL

## Facts

- Endpoint: GET https://assay.agentdiet.dev/?utm_source=zero.xyz
- Price: $0.005000/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: assay.agentdiet.dev
- Website: https://assay.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/assay-agentdiet-dev-a2a-agent-discovery-manifest-live-status-732f0efa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fdcXrcyiHc-ZJ84F4rcxL

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 assay-agentdiet-dev-a2a-agent-discovery-manifest-live-status-732f0efa
```

Example prompt: Can you pull the A2A discovery manifest and live status for https://agentdiet.dev and tell me its grade and score?

## When to prefer this

Use this endpoint when you need to discover what an A2A, MCP, or x402 agent endpoint exposes and confirm it is live — specifically when you want a quick grade/score summary and discovery manifest without running a full deep security audit. Prefer this over the deeper audit endpoint when the goal is lightweight discovery and status checking rather than cryptographic certification.

## Known failure modes

- Invalid or unreachable target URL returns an error status or low score
- Malformed URL input causes a 400/422 validation error
- Target endpoint is offline, returning a degraded status or failed grade
- Pagination cursor is invalid or expired, causing cursor-related errors
- Rate limiting or payment failure resulting in a 402 or 429 response

## How this service works

Return A2A agent discovery manifest and live status (Live x402 v2, IETF MPP & MCP endpoint at https://assay.agentdiet.dev)

## Output

Returns a JSON object containing: the live status string (e.g. 'ok'), a letter grade indicating endpoint quality, an integer score, the audited target URL, and optional pagination fields (has_more, next_cursor) for retrieving additional audit records

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "target"
 ],
 "properties": {
  "target": {
   "type": "string",
   "default": "https://agentdiet.dev"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "status",
  "grade",
  "score"
 ],
 "properties": {
  "grade": {
   "type": "string"
  },
  "score": {
   "type": "integer"
  },
  "status": {
   "type": "string"
  },
  "target": {
   "type": "string"
  },
  "has_more": {
   "type": "boolean"
  },
  "next_cursor": {
   "type": "string",
   "nullable": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/assay-agentdiet-dev-a2a-agent-discovery-manifest-live-status-732f0efa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from assay.agentdiet.dev](https://www.zero.xyz/host/assay.agentdiet.dev/llms.txt)