# AgentDiet Assay – A2A JSON-RPC 2.0 Message/Send Task Executor

> AgentDiet Assay – A2A JSON-RPC 2.0 Message/Send Task Executor 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).

Sends an A2A JSON-RPC 2.0 message/send or tasks/send request to a target endpoint and returns a graded security and protocol conformance result.

## Facts

- Endpoint: POST 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-agentdiet-assay-a2a-json-rpc-2-0-message-send-fae8fd51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qlq8M1_8MAAX7B09jqVh3

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-agentdiet-assay-a2a-json-rpc-2-0-message-send-fae8fd51 -d '<json body>'
```

Example prompt: Can you run a live A2A JSON-RPC 2.0 message/send task against https://agentdiet.dev and give me its conformance grade and score?

## When to prefer this

Choose this endpoint when you need to execute a live A2A JSON-RPC 2.0 message/send or tasks/send call against a specific agent endpoint and receive a graded, scored conformance and security report. It is distinct from static audit or manifest-fetching endpoints because it actively sends a task payload and measures the live response for protocol compliance, TDQS reputation, and security posture.

## Known failure modes

- Invalid or unreachable target URL returns an error status with a failing grade
- Malformed JSON-RPC payload may result in a protocol-level rejection
- Target endpoint timeout causes a failed status response
- Invalid pagination cursor returns an error or empty result set
- Missing required 'target' parameter results in a 422 or 400 validation error

## How this service works

Execute A2A JSON-RPC 2.0 message/send or tasks/send task (Live x402 v2, IETF MPP & MCP endpoint at https://assay.agentdiet.dev)

## Output

Returns a JSON object containing a status string, a letter grade (e.g. A, B, C), an integer conformance score, the target URL that was audited, 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-agentdiet-assay-a2a-json-rpc-2-0-message-send-fae8fd51/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)