# Arcgate Agent Watch Create

> Arcgate Agent Watch Create is a paid API for AI agents from api.arcgate.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Creates a watch on a blockchain address so an agent is notified when on-chain activity occurs

## Facts

- Endpoint: POST https://api.arcgate.dev/agent/v1/:address/watch?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arcgate-agent-watch-create-18ff49c5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LBbHk0y9UsyVDnAJpYxN0

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 arcgate-agent-watch-create-18ff49c5 -d '<json body>'
```

Example prompt: Set up a watch on the address 0xAbC123...def for my agent so it gets notified whenever there's any on-chain activity.

## When to prefer this

Use this endpoint when you need an agent to reactively respond to on-chain events at a specific address — such as triggering swaps, notifications, or other automation when funds move. Prefer this over polling-based approaches for real-time responsiveness.

## Known failure modes

- Invalid or malformed blockchain address returns a 400 error
- Duplicate watch on the same address may return a conflict error
- Insufficient agent box balance to cover the $0.01 USDC call cost
- Address not on a supported chain results in an error
- x402 payment failure prevents the watch from being created

## Output

Returns a confirmation of the created watch subscription, including a watch ID and the monitored address, which the agent can use to track or cancel the watch later.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arcgate-agent-watch-create-18ff49c5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.arcgate.dev](https://www.zero.xyz/host/api.arcgate.dev/llms.txt)