# 8k4 Protocol — Agent Validation History

> 8k4 Protocol — Agent Validation History is a paid API for AI agents from api.8k4protocol.com, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Retrieves validator feedback and validation history for a specific ERC-8004 agent

## Facts

- Endpoint: GET https://api.8k4protocol.com/agents/%7Bagent_id%7D/validations
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/8k4-protocol-agent-validation-history-6a9adb23
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NB85J5u-Cl2tKgx8KeU6Q

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 8k4-protocol-agent-validation-history-6a9adb23
```

Example prompt: Pull up the full validation history for agent 0xabc123 on 8k4 Protocol — I want to see all the validator ratings, comments, and feedback types that have been submitted for them.

## When to prefer this

Use this endpoint when you need the raw validator feedback log and history for a specific agent, rather than an aggregated trust score or explanation. Best for auditing individual validator opinions, reviewing comment-level detail, or building a UI that surfaces who validated an agent and what they said.

## Known failure modes

- agent_id not found — returns empty array or 404
- invalid agent_id format — returns 400 validation error
- no validation history exists for the agent — returns empty array
- network or payment failure — transaction not processed, no data returned
- rate limiting exceeded — returns 429

## How this service works

Get validator feedback and validation history for an agent

## Output

Returns an array of validation records for the specified agent, each containing a numeric rating, a text comment from the validator, a feedback_type integer, and the validator's wallet address.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": [
  {
   "rating": 4,
   "comment": "Reliable execution",
   "feedback_type": 1,
   "validator_wallet": "0xabc..."
  }
 ]
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/8k4-protocol-agent-validation-history-6a9adb23/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.8k4protocol.com](https://www.zero.xyz/host/api.8k4protocol.com/llms.txt)