# 8k4 Protocol — Agent Metadata Lookup

> 8k4 Protocol — Agent Metadata Lookup 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).

Returns processed metadata for a specific ERC-8004 agent, including name, chain, and agent ID information

## Facts

- Endpoint: GET https://api.8k4protocol.com/agents/%7Bagent_id%7D/metadata.json
- 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-metadata-lookup-c1ec2556
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oakml2OFDWFkDvYztS771

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-metadata-lookup-c1ec2556
```

Example prompt: Pull up the processed metadata for 8k4 Protocol agent ID 21480 — I want to see the name, chain, and registration details that are on file for it.

## When to prefer this

Use this endpoint when you need the basic registered identity and metadata for a known agent ID on the 8k4 Protocol network — specifically when you already have the numeric agent_id and want its name, chain, and profile fields rather than a trust score or validation history.

## Known failure modes

- Agent ID not found — 404 with empty or error response
- Invalid agent_id format — malformed URL parameter
- Agent exists but metadata not yet processed — partial or empty metadata object
- Network or API downtime — connection timeout or 5xx error

## How this service works

Get processed metadata response for an agent

## Output

A JSON object containing the agent's chain (e.g. 'base'), numeric agent_id, and a metadata sub-object with at minimum the agent's registered name (e.g. '8k4 Protocol Trust Oracle') and other ERC-8004 profile fields.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "agent_id": 21480,
  "metadata": {
   "name": "8k4 Protocol Trust Oracle"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/8k4-protocol-agent-metadata-lookup-c1ec2556/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)