# LongWatch Add Credits to Watch

> LongWatch Add Credits to Watch is a paid API for AI agents from longwatch.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Top up the delivery credit balance for an existing LongWatch monitoring watch, enabling continued alert polling.

## Facts

- Endpoint: POST https://longwatch.dev/watches/%7Bid%7D/credits
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/longwatch-add-credits-to-watch-c44e8a85
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wtc2hFJwI5BzC3lh8_V8a

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 longwatch-add-credits-to-watch-c44e8a85 -d '<json body>'
```

Example prompt: Add 50 delivery credits to my LongWatch watch ID 5b2e so it keeps polling for new alerts — pay the USDC fee per call.

## When to prefer this

Use this endpoint when you have an existing LongWatch watch that needs more delivery credits to continue generating alerts. This is not for creating new watches — only for funding an already-registered watch identified by its ID. Prefer this over re-registering a watch when you want to maintain continuity of alert history and cursor position.

## Known failure modes

- Invalid or non-existent watch ID returns a 404 error
- Insufficient USDC payment causes payment failure and no credits are added
- Malformed watch ID path parameter returns a 400 bad request
- Network or payment processor timeout leaves credit state unchanged
- Paying exact required amount but on wrong network (e.g. wrong chain) causes payment rejection

## How this service works

You are ephemeral. longwatch remembers what you already saw. Create a watch, persist watch_id + key, poll later for only what you missed — pages, RSS, crypto prices, SEC filings. No API key, no account — pay per call in USDC.

## Output

Returns a JSON object confirming the watch ID and the updated delivery_credits balance after the USDC payment is processed, e.g. {"watch_id":"5b2e…","delivery_credits":50}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "key": {
   "type": "string",
   "description": "watch key"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "watch_id": "5b2e…",
  "delivery_credits": 50
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/longwatch-add-credits-to-watch-c44e8a85/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from longwatch.dev](https://www.zero.xyz/host/longwatch.dev/llms.txt)