# ERC-8004 Agent Trust Score Lookup

> ERC-8004 Agent Trust Score 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 an ERC-8004 trust score for a specific agent on a given blockchain chain

## Facts

- Endpoint: GET https://api.8k4protocol.com/agents/21480/score
- 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/api-8k4protocol-com-ec0ab296
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_svCfmjhM0zpwQ9OJ1d62y

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 api-8k4protocol-com-ec0ab296
```

Example prompt: Can you look up the ERC-8004 trust score for agent 21480 on Ethereum mainnet using the 8k4 Protocol?

## When to prefer this

Use this endpoint when you need a standardized ERC-8004 trust score for a specific agent on a particular blockchain chain, especially when you need a quick numeric reputation signal before deciding whether to interact with or delegate to an autonomous agent. Prefer this over the explanation endpoint when you only need the raw score, not the reasoning behind it.

## Known failure modes

- Agent ID not found — 404 or empty result
- Invalid chain ID — returns error or no score available
- Agent has no on-chain history — score may be null or zero
- Network or RPC issues causing timeout
- Insufficient USDC balance for x402 payment — request rejected

## How this service works

Get an ERC-8004 trust score for a specific agent and chain

## Output

Returns a numeric ERC-8004 trust score for the specified agent on the given chain, reflecting the agent's on-chain reputation and trustworthiness according to the 8k4 Protocol scoring model.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-8k4protocol-com-ec0ab296/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)