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Longwatch Watch Registration
x402
Longwatch Watch Registration is a paid API for AI agents from longwatch.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Registers a standing watch on a web page, RSS feed, crypto price, or SEC filing and returns a poll URL for structured alerts
Price / call$0.005
Success—
StatusUnknown
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 containing a watch key (for authenticated polling), a watch ID, the watch type (e.g. 'edgar'), and a ready-to-use poll_url with a cursor parameter that the agent can call to retrieve structured alerts since a given position.
Example use cases
SEC filing monitor for investor agent
“Register a watch on Tesla's SEC EDGAR filings so I get a structured alert whenever they submit a new 10-K, 8-K, or proxy statement — I want a poll URL I can check from my agent.”
Crypto price alert for trading bot
“Set up a longwatch on Bitcoin's price so my trading agent can poll for alerts whenever it moves significantly — give me a poll URL I can check with a cursor.”
Competitor webpage change tracker
“Create a standing watch on https://competitor.com/pricing so my agent gets alerted whenever that page changes — I need a poll URL to check for updates without re-crawling it myself.”
Technical details
Endpoint
POSThttps://longwatch.dev/watchesWhen to prefer
Choose this endpoint when an AI agent needs to set up a persistent, asynchronous monitor on a web page, RSS feed, crypto price, or SEC filing without maintaining its own polling infrastructure. It is ideal for agents that need to check for changes on a schedule using a cursor-based poll URL, and for use cases where no API key or account management is desired — only pay-per-call USDC via x402.
Side effects
- Invalid or unreachable target URL returns an error
- Unsupported watch type causes rejection
- Insufficient USDC payment (x402 underpayment) results in 402 response
- Duplicate watch registration may return existing watch or create a new one
- RSS feed or SEC EDGAR target temporarily unavailable at registration time
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cik | number | edgar: SEC CIK, alternative to ticker |
| url | string | url|rss|x402: public page, feed, or payment endpoint URL |
| body | object | x402: optional qualified JSON request body |
| coin | string | price: CoinGecko id, e.g. bitcoin |
| type | string | watch type |
| above | number | price: alert when USD price crosses above |
| below | number | price: alert when USD price crosses below |
| forms | array | edgar: form filter, e.g. ["8-K","4"] |
| method | string | x402: unpaid probe method |
| ticker | string | edgar: stock ticker |
| webhook | object | optional: push alerts to this URL as they occur, instead of only polling |
| move_pct_24h | number | price: alert when abs 24h change exceeds this pct |
| expected_scheme | string | x402: optional expected scheme, e.g. exact |
| expected_network | string | x402: optional expected CAIP-2 network, e.g. eip155:8453 |
| expected_amount_atomic | string | x402: optional expected token amount in atomic units |
Output
Schema · Response
{
"type": "json",
"example": {
"key": "kq3…",
"type": "edgar",
"poll_url": "https://longwatch.dev/watches/5b2e…/alerts?since=0&key=kq3…",
"watch_id": "5b2e…"
}
}Tags
x402
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