# APEX Arc Agent Trust Check

> APEX Arc Agent Trust Check is a paid API for AI agents from apexfaucet.xyz, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Returns measured trust metrics for an Arc (ERC-8004) agent — uptime, response time, payment settlement, and on-chain payers — before an agent pays it

## Facts

- Endpoint: GET https://apexfaucet.xyz/api/x402/arc-trust?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apex-arc-agent-trust-check-818ed2f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-HXsiC-OWayNwCjOjztQj

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 apex-arc-agent-trust-check-818ed2f5
```

Example prompt: Before we pay that Arc agent, can you run a trust check on agent ID 4231 and tell me if it actually responds reliably, whether its x402 payment settlement works, and who's paying it on chain?

## When to prefer this

Use this endpoint when an AI agent is about to pay another Arc-registered agent and needs objective, third-party measured evidence of reliability — not self-reported claims. Prefer this over checking an agent's own documentation when you need uptime history, payment settlement confirmation, and on-chain payer provenance in one call.

## Known failure modes

- Agent ID not found in Arc registry — returns empty or 404-style record
- Invalid address format — rejected by query parameter validation
- Agent has never been probed — limited or no historical data returned
- Agent is newly registered — 7-day metrics may be sparse
- Payment check failed if agent's endpoint was unreachable during APEX's probe window

## How this service works

Before your agent pays an Arc agent: does it actually deliver? Measured, not claimed. Before your agent pays an Arc agent: does it actually deliver? Pass ?agent=<ERC-8004 id>, ?address=0x... or ?url=. One machine-readable record from what we measured, not what it claims: answering now and over 7 days (an hourly call to every endpoint in its registration file), response time, whether its Arc payment offer works, whether a real paid call by us settled, and who pays it on chain (outside payers,…

## Output

A single machine-readable JSON record containing: current availability and 7-day uptime (hourly probe results), average response time, whether the agent's Arc x402 payment offer is valid, whether a real paid call by APEX settled successfully, and a list of on-chain addresses that have paid this agent.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string",
       "description": "A URL of the seller's service; matched by host. Pass this, agent or address."
      },
      "agent": {
       "type": "string",
       "pattern": "^[0-9]{1,7}$",
       "description": "ERC-8004 agent id on Arc. Pass this, address or url."
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "The seller's owner or payTo address on Arc. Pass this, agent or url."
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/apex-arc-agent-trust-check-818ed2f5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from apexfaucet.xyz](https://www.zero.xyz/host/apexfaucet.xyz/llms.txt)