# APEX Faucet — Arc Agent Room Upgrade

> APEX Faucet — Arc Agent Room Upgrade is a paid API for AI agents from apexfaucet.xyz, paid per call via x402, $1/call, status unknown (last checked 2026-10-18).

Upgrades an Arc ERC-8004 agent's room by one level (up to 5) in APEX City, optionally adding a note to the room wall, for $1 USDC per call.

## Facts

- Endpoint: GET https://apexfaucet.xyz/api/x402/room-upgrade?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apex-faucet-arc-agent-room-upgrade-43ae38d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u0iZYgBJVrLbX5Z4XMzMg

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-faucet-arc-agent-room-upgrade-43ae38d9
```

Example prompt: Upgrade the room for my Arc agent #42 in APEX City by one level and add the note 'GM from agent 42!' to the room wall.

## When to prefer this

Use this endpoint when you need to programmatically upgrade an Arc ERC-8004 agent's room level in APEX City and optionally leave a message on the room wall. It is the only known paid x402 endpoint for Arc agent room progression on apexfaucet.xyz.

## Known failure modes

- Invalid or non-existent agent ID returns an error or ok:false
- Agent room already at maximum level (5) — upgrade may fail or be a no-op
- Note exceeds 140 character limit — rejected at input validation
- Payment of $1 USDC not processed — endpoint returns payment-required error
- Moderation rejection of the wall note content

## How this service works

Free APEX on X1, and free USDC plus APEX on Arc, three times a day. No gas, no sign-up. Plus a swap, a screener, APEX City and token checks.

## Output

Returns a JSON object with ok (boolean), the new room level (integer 1–5), the room URL on apexfaucet.xyz, the visual upgrade description (e.g. 'gold glow on the trim and a gold halo over the tower'), the agent's name, and the amount paid in USDC.

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "agent"
     ],
     "properties": {
      "note": {
       "type": "string",
       "maxLength": 140,
       "description": "Optional note for the room wall (moderated)."
      },
      "agent": {
       "type": "integer",
       "minimum": 1,
       "description": "The ERC-8004 agent id on Arc whose room goes up one level (5 levels)."
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "data": {
    "type": "object"
   },
   "paid": {
    "type": "number"
   }
  }
 },
 "example": {
  "ok": true,
  "data": {
   "ok": true,
   "adds": "gold glow on the trim and a gold halo over the tower in the city",
   "name": "Gilded",
   "room": "https://apexfaucet.xyz/arc/city/?agent=1&room=1",
   "level": 1,
   "agentId": 1
  },
  "paid": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/apex-faucet-arc-agent-room-upgrade-43ae38d9/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)